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ELECTROMECHANICAL WORK AT GENERALSECRETARIAT OF THE EXECUTIVE COUNCIL

WAREHOUSE IN MUSAFFAH - ABU DHABI, UAE

TENDER DOCUMENTS

Volume 3

Technical Specifications

Part 3 of 3

Electrical Works

JANUARY 2015



ElectroMechanical Work at General Secretariatof the Executive Council WarehouseMussafah, Abu Dhabi – UAE

Technical SpecificationsDivision 16: Electrical

Table of Contents

Table of Contents - Electrical Installations Page 1 of 1 Date: 09/08/2014

TABLE OF CONTENTS

PART 3 OF 3 – ELECTRICAL INSTALLATIONS

DIVISION 16 – ELECTRICAL

SECTION 16010 - GENERAL ELECTRICAL R EQUIREMENTS

SECTION 16035 - PAINTING A ND A NTI CORROSION TREATMENTS

SECTION 16060 - EARTHING SYSTEM

SECTION 16110 - CONDUITS AND WIREWAYS

SECTION 16120 - WIRES, CABLES AND FEEDERS

SECTION 16140 - WIRING DEVICES

SECTION 16244 - EMERGENCY LIGHTING SYSTEM

SECTION 16363 - MV SWITCHGEAR

SECTION 16363 - MV SWITCHGEAR DATA SHEET

SECTION 16442 - PANEL BOARDS (MDBS, SMDBS, AND DBS)

SECTION 16500 - LIGHTING I NSTALLATIONS

SECTION 16721 - FIRE ALARM SYSTEM

_________________________





General Electrical Requirements

16010 - General Electrical Requirements Page 1 of 5 Date: 09/08/2014

SECTION 16010

GENERAL ELECTRICAL REQUIREMENTS

PART 1 GENERAL

1.1 SCOPE

A. Generalities:

1. The Contractor must provide complete installations from the power supply

terminals indicated on the drawings. The scope of work includes supply,

installation of material and equipment as described in the specifications

and/or shown on the drawings and full compliance with local authority

regulations. Associated civil works including supporting structure are also theresponsibility of the Contractor.

2. The contractor is required to provide on completion Electrical Test

Certification in full compliance with Abu Dhabi wiring regulations

B. General Conditions and Requirements:

1. All electrical works shall be carried out in accordance with ADDC

regulations and the latest issue of the IEC publications.

2. MV /LV power installations, telephone installations and civil works to be

supplied and installed as required by the Drawings and Bill of Quantities, and

whenever not listed as separate items in the Bill of Quantities are deemed to

be allowed for in the Contractor’s unit rates and prices.

3. Equipment and material are to be new and manufactured in compliance with

the relevant recommendations of the International Electro-technical

Commission (IEC) or approved equivalent standards.

4. Locations shown on the drawings indicate the approximate location of

apparatus. Exact and final locations are to be coordinated with AADC and all

other trades.

5. Work must be carried out in a neat and efficient manner in accordance with

the specifications. Installations are to be complete ready for operation and

fully coordinated with all other works.

6. Necessary items/accessories for operation of the systems are to be provided

even if not mentioned in the specification/or shown on the drawings.

7. Wiring layout shown on drawings is to be used only as a guide. Electricaldrawings must be checked against all other trades drawings.

8. Contractor is responsible to prepare all documents /drawings and obtain

approval from local authority.

9. All structured cabling net works shall be executed by specialist contractor

approved by Etisalat.

10. All new electrical and low current systems shall be integrated with the

existing systems. New systems adopted shall be compatible with the existing

building systems and components.

C. General Design Conditions:

1. Power will be delivered to the site by relevant local authority at 11KV. LV

shall be at 400/ 230 V, 3 phase, 4 wires, 50 Hz, or at 230 V, single phase, 2wires, 50 Hz. An earthing system should be provided.







2. Equipment shall be selected for continuous and trouble free service under

climatic conditions of equipment location.

3. The installation shall conform to the requirements of following regulationsand standards.

D. Regulations and Standards:

The local regulatory authorities:

ADDC

ABUDHABI Municipality (ADM)

Emirates Telecommunications Corporation (ETISALAT)

Civil Defense Authority (CDA) requirements and

regulations. All works should be completed in full

compliance with the UAE Fire Regulations & Abu DhabiEHSMS Framework agreement

The Relevant British Standards

Abu Dhabi Wiring Regulations 2009 based on the 17th

edition of the IEE regulations

The Chartered Institution of Building Services (CIBSE)

Lighting Design Recommendations and Standards.

IEC 364-International electrotechnical committee regulations

for low voltage installations.

NFPA-American standards for fire detection systems and for

life safety.

NFPA-110/IEC standards American & international

regulations for standby generator installations. ANSI/TIA- 942 Telecommunication standards for data

center

ISO / IEC 11801-Information technology

Industry Committee for Emergency Lighting (ICEL)

Recommendations.

International Electro-technical Commission (IEC) Standards

E. Contractor Responsibility:

1. The Contractor shall be responsible of the work covered in this division

including the supply, transport, storage, installation, testing and delivering in

good running conditions the electrical installations. The installation of all

items shall be as specified and shown on drawings, catalogues.

2. Contractor is responsible to obtain all necessary approvals from authorities.

F. Coordination of Work:

1. The Contractor shall be responsible for coordinating the work of the electrical

installations with that of other trades. He shall prevent interference’s and

conflicts and shall be the sole responsible for damages to work of other

trades, already completed.

1.2 PERFORMANCE AND STANDARDS

A. Site Tests:1 Acceptance tests should be carried in accordance with the ADDC regulations

and standards. Equipment and labor for testing are to be provided by the







Contractor. Site test should be in line with Abu Dhabi wiring regulations 2009-

including Earth Loop Impedance testing.

1. A visual inspection to check proper installation, connections and nameplate

data must be carried on before testing.

2. Lighting and power circuits, motors, etc., must be subjected to an installation

resistance test with a Megger of at least 1000 Volts operating voltage.

Communications and security systems must also be subjected to a resistance

test.

3. A continuity test to all major feeders and circuits must be done.

4. Site test should be in line with Abu Dhabi wiring regulations 2009- including

Earth Loop Impedance testing

B. Manuals:

1. Complete 2 sets of instruction manuals must be provided. These should cover

operation, maintenance and spare parts list of all equipment and systems.

C. As-Built Drawings:

1. Complete sets of as-built drawings must be provided, including:

a. Two hardcopies.

b. One transparent copy.

c. One soft copy.

D. Manufacturer’s Guarantee:

1. One year warranty for equipment specified in this document must be

provided.

E. Contractor’s Guarantee:

1. The Contractor shall guarantee his works for the duration of one year from

the date of the completion certificate.

2. If during guarantee period any equipment or material proves defective or any

of systems fails to function properly, equipment is to be replaced and defects

and malfunctions corrected as directed by the Engineer.

3. If during guarantee period any piece of equipment is replaced or rebuilt, the

guarantee period for this equipment is to be extended for a new period equal

to the original guarantee period.

F. Maintenance and Operation:

1. The Contractor shall provide necessary skills and labor to assure proper

operation and shall provide regular and preventive maintenance required for

equipment and controls during guarantee period, on a continuous 24 hours

basis. He has to act promptly to correct problems arising in operation of

equipment or system.

2. The Contractor has to provide the employer with monthly inspection

certificates of equipment, record findings on a check list and certify that each

piece of equipment has been examined, is operating as intended and has been

properly maintained as recommended by manufacturer.

3. The Contractor has to check all controls monthly to ascertain that theyfunction as designed.







4. The Maintenance & Operation should be handed over on completion to the

Service Provider following systems training & issue of O&M's only defects

should be the responsibility of the installer.

1.3 SCOPE OF WORK

A. Unless otherwise specified, electrical work includes the supply, installation, testing

and commissioning of the complete electrical systems, equipment and materials

shown on the Drawings and/or described in the Specification together with all

associated ancillary work, support work and builder’s work in connection.

B. The scope of work shall include for the coordination with the Electrical local

authority for execution of MV, LV, lighting fire alarm system and telephone

installations. It’s the full responsibility of the Contractor to pay and to include in his

cost all fees relating to the execution of all the civil works related to these works, anysubscription fees, supervision fees, installation of LV breaker, and any Electrical local

authority charges for power connections that are to be paid to Electrical local

authority.

C. Work related to the electrical installation provided for in this Specification is to

include any or all the following system as specified or required in the Drawings and

Bill of Quantities.

1. LV Panel Boards.

2. Substation as per AADC requirement

3. Medium and low Voltage Cables including jointing of MV and LV cables.

4. General Lighting Installations.

5. Earthing System.

6. Builder’s Work.

7. Telecommunication Works.

8. Installation Testing.

9. Equipment Data.

D. The work will include the provision of shop drawings and the calculations required

by the Specification, as well as the provision of all literature and samples in

connection with the approval of proposed equipment.

1.4 The equipment supplied will include all necessary items for a complete installation, which

will give satisfactory operation not withstanding errors and omissions. The equipment listedin the documents is, therefore, indicative and not limitative.

1.5 SUBMITTALS

A. Shop Drawings:

1. The Contractor is responsible to prepare the following sets of shop drawings

and ask for approval before any construction:

a. Two hardcopies.

b. One transparent copy.

c. One soft copy.

2. These drawings are to show that the design concept is understood.







B. The Contractor has to submit priced lists of recommended spare parts for one-year

operation, after substantial completion.

C. Documents relative to equipment to be supplied and installed must be submitted for

approval. Therefore, no equipment shall be installed before getting prior approval.

D. For approval, the Contractor has to submit detailed manufacturer's specifications,

original catalogue cuts and drawings of equipment and materials to be used.

E. The client reserves the right to operate operable defective equipment, during

guarantee period, until its repair or replacement. Spare parts shall be supplied and

shall cover the items recommended by the manufacturer for two years operation.

1.6 TRAINING

A. The Contractor shall, at no additional cost, demonstrate to operating personnel the

functions and operation of all equipment before handing over. The operating

personnel must be trained to perform necessary adjustments to equipment, appliances

and effect routine maintenance.

PART 2 PRODUCTS

Not Applicable

PART 3 EXECUTION

3.1 Tests to include Earth Loop Impedance test & RCD test where applicable. In

line with Abu Dhabi Wiring Regulations

END OF SECTION





Painting and Anti Corrosion Treatments

16035 - Painting and Anti Corrosion Treatments Page 1 of 5 Date: 09/08/2014

SECTION 16035

PAINTING AND ANTI CORROSION TREATMENTS

PART 1 GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract including "Conditions of Contract"

and "General Requirements" specification sections, shall apply to this section.

1.2 SCOPE

A. Section includes surface preparation and application of paints and anti corrosiontreatments for electrical products, materials and equipment.

B. Related Sections:

1. Division 16 - Electrical.

1.3 GENERAL REQUIREMENTS

A. Where particular methods of finish and painting are not specified, ensure following

requirements are met:

1. Protect all metal work, plant, equipment, pipelines, ductlines, ancillaries,

brackets and supports against corrosion and oxidization.

2. Provide ferrous metals, machined or otherwise with protective coatings atmanufacturer's works.

3. All electrical containment elements like tray, trunking, supports, etc., exposed

to public view like car park etc., shall be applied with primer and painted to a

color of Engineer’s choice.

4. Ensure all items requiring on-site decorative finishes are provided primed to

suit base material and required finish.

B. Anticorrosive and decorative paints systems shall be from one of the approved

manufacturers. Contractor shall make a proposal, for the painting and anticorrosive

treatments for various items of work (which are not treated as such by the

manufacturer) for approval.

1.4 DAMAGED FINISHES

A. Following delivery to site, storage on site and installation, make good any damage to

finishes, by cleaning, degreasing and re-furbishing before installation is taken over.

1.5 PAINTING REQUIREMENTS

A. Anticorrosive Coating and Painting to Surfaces:

Surface Anticorrosive Coating and Painting

1. All un-insulated steel pipework

installed in conditioned space

within the building and within

ceiling voids.

Two coats of red oxide primer. In addition

apply two coats of synthetic enamel paint,

color to Engineer’s choice for exposed to

view pipes.







2. Un-insulated steel pipes installed

outside the building on roof and in

the basements.

Two coats of two-pack epoxy paint on all

pipework, color to Engineer’s approval.

3. All galvanized steel pipes surfaces

exposed to view, un-insulated.

Two coats of etching primer followed by

two coats of approved synthetic paint,

color to Engineer’s choice (for fire services

color shall be red).

4. Un-insulated PVC pipework

surface exposed to sunlight on roof.

Two coats of UV resistant white paint.

5. Supports exposed to view in car

parks, roof, plant rooms.

Galvanized and painted.

6. Supports in ceiling void. One coat of red oxide primer and two coats

of black enamel.

7. Support, brackets, hangers in roofsand other exposed locations. Mild steel brackets, angles, channels andhangers, all galvanized after manufacture.

B. Equipment and all pipework ancillaries shall be provided with factory applied paint.

PART 2 PRODUCTS

2.1 MATERIALS

A. Use the following materials for corrosion protection and painting:

1. Red oxide priming paint for bare iron and steelwork.

2. Zinc Chromate priming paint for non-ferrous metals.3. Calcium plumbate priming paint to BS 3698 for galvanized steel.

4. Undercoating paint for previously primed or painted surfaces before

application of finishing coats.

5. Gloss finishing paint for previously primed or painted/undercoated surfaces.

6. Epoxy resin paint for specialist coatings requiring resistance to acids, alkalis,

oils, solvents, abrasion or high humidity.

7. Cold galvanizing paint for making good damage to previously galvanized

surfaces and protection to galvanized materials modified during installation.

8. Zinc-rich metallic to BS 4652 for bare iron and steelwork where electrical

conductivity has to be assured.

9. Bitumen based coating for cold application to BS 3416 protection to iron and

steel, particularly pipelines and fittings for use in contact with potable water.10. Bitumen based coatings for cold application to BS 6949 not to be used in

contact with potable water.

11. Tar based epoxy coatings on all cast iron/ductile iron manhole covers,

gratings, gulley traps, etc., in car park areas, external unpaved areas.

2.2 PAINT QUALITY

A. Ensure paints used are of quality and type to suit application and that primers have

good adhesion, covering power, rust-inhibiting and grain filling properties; gloss

finishing paints are of machine finish grade having high adhesion and high resistance

to solvents, mineral oils, cutting oils, detergents, chipping and impact damage.







2.3 HEAT RESISTANT PAINT

A. Use heat resistant paints for applications to surfaces over 80ºC.

PART 3 EXECUTION

3.1 GENERAL

A. Contractor shall propose paint corrosion protection system for all services

applications from one of the acceptable paint manufacturers, for approval for only the

approved paint system.

B. Ensure paints are applied to manufacturer's instructions and to BS 6150.

C. Install work in accordance with approved standards, as per manufacturer’s

recommendations, to the satisfaction of the Engineer, and with full coordination with

local relevant authorities.

3.2 PAINTING

A. Ferrous sheet metal work or structural support elements which are not galvanized

shall be cleaned to remove all grease and rust and have a protective coat of paint or

other approved material applied before dispatch from works. Other ferrous materials

shall receive a protective coating at works, or alternatively, be treated in accordance

with the manufacturer's approved corrosion resisting metal finishing process. Any

deterioration or damage to manufacturer's protective coating during transportation,storage and following installation shall be made good to the satisfaction of the

Engineer. Damaged areas shall be made good as if they were bare metal.

B. The Contractor shall be responsible for painting thermal insulation where indicated.

C. The surface of all ferrous metal work including pipework, brackets, hangers,

steelwork, etc., (excluding ductwork), which are not protected by galvanizing shall be

cleaned to remove all grease and rust and then given one coat of primer and finished

with two coats of approved quality non-metallic paint of a color agreed with the

Engineer. The surfaces of all ferrous pipework which are to be insulated shall be

given one coat of primer. Where surfaces will be subjected to temperatures above

100ºC. the finishing coat(s) shall be heat resisting paint and the primer omitted.

D. All services exposed to view shall be painted by 2 coats of enamel paint. Color to

Engineer’s approval.

E. All exposed to view pipework shall be cleaned to remove all grease and rust and then

given one coat of primer and finished with two coats of approved quality non-metallic

paint to a color agreed with the Engineer.

F. Pipework and ductwork services shall be correctly identified in order to facilitate the

use of approved paint of the correct color to comply with BS 1710 and the Engineer's

instructions.







3.3 CLEANING AND PREPARING SURFACES FOR PAINTING

A. Ensure metal surfaces are thoroughly cleaned, all mill and weld scale removed andfinally degreased.

B. Clean steel surfaces in accordance with BS EN ISO 8503.

C. Prepare surfaces for painting in accordance with BS EN ISO 4618.

3.4 WEATHER AND OTHER CONDITIONS

A. Do not apply paints where weather, temperature, humidity or other conditions may

have a damaging effect upon finish or paint.

3.5 APPLICATION OFF-SITE

A. Wherever possible ensure paint finishes applied by manufacturers are spray applied.

3.6 FIELD APPLICATION

A. Apply paint evenly and ensure finish shows no excessive brush marks, grinning, runs,

sagging, or other application defects.

3.7 HOT DIPPED GALVANIZED SURFACES

A. Galvanizing shall be applied by the hot dipped process. The preparation for

galvanizing and the galvanizing process shall not adversely affect the mechanical properties of the material being coated.

B. All drilling, punching, cutting, bending, welding and removal of burrs shall be

completed before galvanizing.

C. Surfaces in contact with oil shall neither be galvanized nor cadmium plated, unless

finished with an oil resisting varnish.

D. The average thickness of the zinc coating shall be equivalent to not less than 0.6kg/m²

of zinc for all surfaces, except steel wires.

E. The thickness of the zinc coating for steel wires shall be in accordance with a nationalor international standard and shall be approved by the Engineer.

3.8 SITE REPAIRS OF GALVANIZED SURFACES

A. Repair damage to galvanized components due to installation process (i.e. following

cutting, drilling or welding) by applying two substantial coats of approved cold

galvanizing coat.

3.9 PROTECTION OF BRIGHT MACHINE PARTS

A. Apply a protective coating to all bright machine parts before dispatch from works.







B. Do not remove protective coatings unless required for installation, testing or

commissioning purposes and in such cases reinstate upon completion.

C. Repair any damaged protective coating or bright machined part, or where necessary

replace damaged component.

D. Use and apply metal coatings in accordance with manufacturer's instructions.

E. Complete, if possible, welding, drilling, bending and other work before metal coating.

END OF SECTION





Earthing System

16060 - Earthing System Page 1 of 2 Date: 09/08/2014

SECTION 16060

EARTHING SYSTEM

PART 1 - GENERAL

1.1 SCOPE

A. Supply and install equipment required to connect to earth all electrical equipment and

installations in compliance with the relevant clauses of the I.E.C Regulations and based on

the TT earthing system.

B. Work will include without limitation:

1. Main earth system as per ADDC requirements.2. Generators earth system (including earthing of the generators neutral (if applicable).

3. Test links.

4. Earthing bars (in electrical & technical rooms).

5. Main earthing conductors (from earthing bar to the main distribution boards).

6. Earthing of enclosures and shielding of electrical systems and equipments.

7. Earthing of exposed conductive parts existing inside electrical/mechanical equipment

rooms.

8. Bonding conductors to all extraneous conductive parts of the building.

C. Earthing installations shall be in conformity with IEC publications 364-3 and 364-4-41.

D. Earthing for data center as per ANSI –TIA 942 regulations.

1.2 SUBMITTALS

A. The following data (but not limited to ) are to be provided:

1. Manufacturer’s catalogue cuts for all accessories.

2. Shop drawings coordinated with all other trades showing exact location of earthing

bars, details of installation, exact routing of protective and bonding conductors with

cross sectional area.

PART 2 - PRODUCTS

2.1 APPROVED MANUFACTURER AS PER VENDOR LIST

2.2 MATERIALS

A. Electrical earth system consists of one or more earth pits at ground floor level providing an

earthing connection point with less than five ohms resistance to the general mass of earth.

B. At each of the facilities, an earthing bar shall be supplied, connected with two insulated

earthing conductors to earth electrodes via test links and as shown on drawings to which the

following shall be connected.

1. Exposed conductive parts at MDB room

2. Main equipotential bonding bar of all extraneous part.





Earthing System

16060 - Earthing System Page 2 of 2 Date: 09/08/2014

C. Concrete earth pit is to contain one directly driven 1.8m rod with cable conductor on top.

Diameter of the rod should not be less than 17mm.

D. Earth rod is to be of high strength steel alloy core with molten welded copper stranded cable

35mm2, buried 700mm below ground and at least 700mm distant from concrete structure.

E. Permanent earthing connections are to be made by exothermic welding process.

F. Materials used for earthing are to be copper or approved copper alloys specially

manufactured for the purpose. Electrical continuity is to be of durable construction

providing an independent fault current return path of low resistance to the site earth.

G. Earthing and protective conductors shall be 1000V, PVC insulated multi-stranded cable.

PVC cable insulation shall be continuous and intermediate jointing is not permitted.

H. Non current-carrying metal parts such as metal conduits, raceways, outlet boxes, cabinets,

enclosure doors, etc., must be earthen.

I. Water mains pipe, on street side, is to be connected to site earth.

J. Cross- sections of supply phase conductors less or equal than 16 mm2 shall have equal

protective conductor size cross-section.

K. Conductor size is to be cross section half that of main supply phase conductors for sections

greater than 16 mm2.

L. Conductor size to be in accordance with the Regulations and in no case less than 2.5mm2.

PART 3 - EXECUTION

3.1 Earthing installation shall be protected from mechanical damage and corrosion.

3.2 Electrical continuity is to be of durable construction providing an independent fault current

return path of low resistance to earth.

END OF SECTION





Conduits and Wireways

16110 - Conduits and Wireways Page 1 of 4 Date: 09/08/2014

SECTION 16110

CONDUITS AND WIREWAYS

PART 1 GENERAL

1.1 SCOPE

A. Work is deemed to include:

1. Heavy gauge PVC rigid conduits.

2. Heavy gauge steel conduits.

3. Flexible steel conduit.

4. Cable Trays & Ladders.

5. Mounting fitting, fixing, etc…6. Cutting and jointing, bending, etc.…

7. Junction boxes, expansion joints connectors, etc.…

8. Components for earth continuity.

1.2 SUBMITTALS

A. The following data (but not limited to) are to be provided:

1. Manufacturers catalogue with specifications.

2. Samples.

3. Shop drawings showing the exact routing of conduits, cable trays, boxes and

accessories with their types and dimensions.

PART 2 PRODUCTS

2.1 APPROVED MANUFACTURER AS PERVENDOR LIST

2.2 RIGID HEAVY GAUGE PVC CONDUITS AND FITTINGS

A. Material is to be of rigid unplasticized PVC, high impact, resistant to chemical

corrosion, self-extinguishing. Conduits shall have a compression resistance of 750 N

per 5 cm. Material shall operate in a temperature range of -5°C to 60°C. Conduits

shall be marked at intervals of 1 to 3 meters. Inside and outside surfaces of conduits

shall be free from burrs, flash and other similar defects. Wall thickness of conduitsshall be uniform.

B. Conduits shall comply with BS 6099-2-2.

C. Flexible conduits of same material are to be used for connection to motors and to

fixtures installed in false ceiling.

2.3 RIGID HEAVY GAUGE STEEL CONDUITS AND FITTINGS

A. Conduits and fittings shall be of heavy gauge drawn and welded steel, screwed

galvanized and not less than 20 mm external diameter.







B. Conduits shall be free from rust patches or mechanical damage and shall be

adequated protected from damage whilst stored on site. All exposed threads, die

marks and other abraisons shall be painted with two coats of an approved metallic paint immediately the conduit is installed.

C. Steel conduits and fittings shall comply with BS 4568 part 2.

D. Application:

1. In mechanical and electrical rooms (if exposed installations).

2. In exposed area subject to physical damage.

2.4 FLEXIBLE STEEL CONDUITS

A. Flexible conduits and assemblies are to be made from galvanized steel to BS 731.

B. Where exposed to moisture conditions, conduits are to have PVC sheath.

C. Application: for final connection of the rigid steel conduit to the terminal boxes of

machines and/or where vibration is likely to occur.

2.5 CABLE TRAYS

A. Heavy-duty cable trays shall be of the return flange type slotted and perforated.

Trays shall be Hot-dip galvanized after perforation protected by two pack epoxy

finish, minimum 1mm thick (galvanizing in accordance with BS 729). Trays shall be

jointed with flange coupling strops that virtually make the flanges continuous.

These shall be secured in place with nuts and bolts.All cable tray runs shall be continuous and constructed of bends, tees and other

accessories that are purpose made by the manufacturer of cable tray.

Cable tray shall have adequate mechanical strength for the load to be carried and

shall have provision for the addition of a minimum of 20% of the initial installed

cable and/or load. The deflection shall not exceed that recommended by the

manufacturers.

B. The cable trays shall have engraving marks of the serie and identification numbers.

2.6 CABLE LADDER

A. Cable ladder shall be constructed in mild steel galvanized after perforation and

protected with a two pack epoxy finish (galvanizing in accordance with BS729).

All cable ladders shall have sufficient strength and space allowance to accommodate

the future installation of an addition of 25% of the initially installed load.

Cable ladders shall not be used with greater loading or spans than those

recommended by the manufacturers.

All bends, tees or other accessories shall be purpose made by the manufacturer of

the cable ladder.

Application: Vertical mounting for installation of cable in shaft.







PART 3 EXECUTION

3.1 CONDUITS

A. The installation and capacity of the conduits shall be in accordance with the I.E.E.

Wiring Regulations.

The installation shall be neat and tidy.

Means shall be provided to prevent condensed or entrapped moisture remaining

within the conduit system.

The conduit system, joint boxes, loop boxes etc. shall be firmly supported.

The system shall be clean and free of sharp edges, burrs etc.

Due allowance shall be made for expansion and contraction.

PVC rigid conduit shall be formed on site. Prefabricated conduit systems shall not

be accepted.

Standard circular or looping in boxes shall be installed at intersections. Smallcircular channel type inspection fittings will not be approved.

Cables connected to different category circuits shall not be run through a common

box.

Standard conduit boxes shall be installed at all lighting points and shall be

substantially fixed so as to be supported independent of the conduit system.

Conduits shall terminate directly into fixed lighting fittings having provision for

direct conduit entry.

Conduit shall be installed at least 100 mm clear of, and preferably above, pipes and

any other services.

Under no circumstances shall accessories of one type of conduit system be used

with another conduit system. e.g. black accessories may not be used with galvanizedconduit.

Not more than two right angle bends shall be allowed in any surface mounted

conduit run without the provision of an inspection fitting for drawing in purposes

between them.

Surface mounted Conduits shall not be dismantled for wiring, and must be capable

of being wired complete without draw wires being installed during erection.

Sleeves for cable must be filled with a fire retardant compound to prevent fire

spread from one compartment to another.

Conduits specified to run on the surface shall be fixed by means of galvanized

distance saddles to allow a 5mm space between the surface and the conduit.

B. Spacing of saddles for supporting of surface mounted PVC conduits is not to begreater than:

Conduits size (mm) Maximum spacing of supports (m)

20

25-50

63-75

90-125

0.6

0.75

0.9

1

C. Spacing of saddles for supporting of surface mounted steel conduits is not to be

greater than:

Conduit size (mm) Maximum spacing of supports (m)







20

25

32-38

50-63

75 and larger

3

3.6

4.25

5

6

D. Sizes of conduits not shown on the drawings are to be selected in accordance with

the regulations and in relation to the number and size of conductors as shown in the

table below:

Number of Conductors Relating to Exterior Diameters of Conduits

A B C D

20 25 32 20 25 32 20 25 32

1.5 7 7 7 7 7 7 6 7 7

2.5 7 7 7 6 7 7 4 7 74 5 7 7 4 7 7 3 6 7

6 4 7 7 3 6 7 - 4 7

10 - 4 7 - 3 6 - - 4

A: Section of Conductors (mm²)

B: Straight Run

C: Run With One Bend

D: Run With Two Bends

Minimum size of conduit is to be 20mm (external diameter), unless otherwise indicated.

3.2 CABLE TRAYS – CABLE LADDERS

A. All sizes of cable trays shall be attached to the building framework at intervals not

more than that recommended by the manufacturer.

Screws and bolts securing trays to brackets and joining trays shall be arranged so as

to prevent damage to cables.

Cutting and modification of straight tray, ladder will not be permitted without prior

approval.

Additional protection of fireproof barriers should be provided where cable trays pass

through walls and partitions.

Cable trays and ladders are to be earthen at maximum spacing of 30m, by a cable of

16mm² section.

END OF SECTION





Wires, Cables and Feeders

16120 - Wires, Cables and Feeders Page 1 of 3 Date: 09/08/2014

SECTION 16120

WIRES, CABLES AND FEEDERS

PART 1 GENERAL

1.1 SCOPE


1. Low voltage power cables.

2. Branch circuit wiring.

3. Control cables.

4. Telephone cables.

5. Termination and identification requirements.

B. The Contractor shall be responsible for all off loading and handling of cable on site

and shall ensure that cables are delivered to site on drums properly protected against

mechanical damage.

C. The Contractor shall be responsible for finally checking the sizes of all cables to suit

the load. The sizes of the cables and conductors shall take into account voltage

drops, fault levels, over current setting of relays, route length, derating factors,

method of laying and ambient conditions.

1.2 SUBMITTALS

A. The following data (but not limited to) are to be provided:

1. Full details, catalogues and manufacturer data.

2. Samples.

3. Shop drawings coordinated with all other trades showing exact routing of

feeders, subfeeders, number and size of conductors in conduits, details of

supports, details of connection, etc.

4. List of all feeders and subfeeders with their sizes, route length, voltage drops,

etc.

PART 2 PRODUCTS

2.1 APPROVED MANUFACTURER AS PERR VENDOR LIST

2.2 MATERIALS

A. Cables shall have stranded copper conductors for sections 4mm² for power cables

and 1.5mm² for control cables.

B. Cables shall be manufactured to IEC 502.

C. Cable cores shall be color coded for identification.

1. "Red", "Yellow" and "Blue" shall be used for phase conductors.

2. "Black" for neutral.

3. "Green / Yellow" for earth conductors.







D. Single conductor wires and cables for wiring and conduits are to have high

conductivity, electrolytic annealed copper conductors insulated with PVC flame

retardant, rated 450 / 750 V to IEC 227, and suitable for conductor temperature of70ºC.

E. PVC insulated cables are to have high conductivity electrolytic annealed copper

conductors insulated with PVC flame retardant suitable for conductor temperature of

70ºC, bedded with suitable filler and sheathed with PVC. Cables are rated 0.6/1 kV.

F. Fire resistant power cables are to have plain annealed copper stranded conductors,

insulated with a mineral ceramic fire resistant tapes and a 90°C, cross- linked

insulation, bedded with an extruded of steel wires and sheathed with a low smoke free

halogen sheath. Fire resistant cables are rated 0.6 / 1 kV, conform to requirements of

IEC 331 and IEC 332.

G. Control cables are to be multicore, PVC insulated and sheathed, rated 0.6/1 kV.

Insulated conductors are to be numbered.

H. Sheathed and insulated flexible cords shall be 300/500V rated to IEC 227 and shall

only be used for lighting pendants.

I. The minimum cross sectional area of conductors in flexible cords shall be 0.75mm²

and the length not exceeding 400mm.

J. Telephone cables for wiring to outlets are to be twisted PVC insulated and PVC

sheathed 0.6mm diameter.

1. Additional ground wire is to be provided in each cable.

PART 3 EXECUTION

3.1 INSTALLATION

A. Conduit wiring system shall be used for final branch circuit wiring.

B. Wiring termination and joints shall be made only at switches, isolators and

appliance fittings.

C. Installation of each conductor is to be color-coded. Contractor has to maintain

coding throughout the installation.

D. Before any cables are installed, the conduit installation and erection of distribution

boards shall be complete, dry, clean and free of burns.

E. Cables required to be run on walls, ceilings, or other structures should be carried on

cable trays or cable ladders.

F. All cables shall be neatly run vertically or parallel to adjacent walls, beams or other

structural members. Allowance shall be made for expansion and contraction of the

cable.







G. The Contractor shall take all precautions to ensure that cables are not subjected to

excess heating from adjacent service pipes.

H. Where cables are routed externally and are subject to exposure to direct sunlight,

they shall be protected with a suitably ventilated cover to shade the cables and to

allow adequate ventilation. Where changes in direction occur in cable runs, bends

having a radius of curvature not less than the minimum-bending radius

recommended by the manufacturer shall be used.

I. All cables run between defined terminal points shall be installed without

intermediate joints.

J. Every cable shall be permanently identified using purpose made indelible markers.

K. Single cables are to be fixed directly to walls or ceilings. Where three or morecables are run in parallel, they are to be fixed on cable trays.

L. Power cables shall be terminated in suitable boxes arranged for bolting to

switchgear, motor starters and motors. Each cable entry into a terminal box shall be

made through a suitable gland.

M. At terminations the cores of the cables shall be left of sufficient length beyond the

termination to form cable tails for connecting to the equipment. Tools shall be

adequately insulated and end cable core shall have its phase identification clearly

marked.

N. A sufficient number of terminals shall be provided to terminate all control cablecores.

O. Terminal blocks for different voltage or circuit type should be segregated into

groups and distinctively labeled.

P. Cabling in plant areas, external areas shall be provided with armored cable

Q. Provide Cable Identification Tags & Glanding Arrangements.

END OF SECTION





Wiring Devices

16140 - Wiring Devices Page 1 of 2 Date: 09/08/2014

SECTION 16140

WIRING DEVICES

PART 1 GENERAL

1.1 SCOPE


1. Supply and installation of electrical fittings including switches, automatic and

manual lighting control equipment, sockets, disconnecting switches, etc., as

shown on the drawings.

2. Wiring devices are deemed to include outlets, wires with protective earthing

conductors, conduits, trunking, and other raceways and fittings from outlet back to upstream outlet or controlled circuit (for switches, etc.), or to final

branch circuit panelboard.

3. Fixing and supporting material.

4. Cables, conduits and fittings from telephone outlet to telephone distribution

frame/ telephone box.

5. Cables, conduits and fittings from TV outlet to the TV splitter or tap unit.

B. All devices are to be standard manufactured items, uniform and modular.

1.2 SUBMITTALS

A. The following data (but not limited to) are to be provided:1. Manufacturer's catalogue cut with complete detailed specifications, catalogue

number, rating, overall dimensions, etc.

2. Shop and construction drawings showing exact location of each outlet box,

installation details, wiring diagrams, etc.

3. Samples along with material approval requests.

PART 2 PRODUCTS

2.1 APPROVED MANUFACTURER AS PER VENDOR LIST

2.2 OUTLET BOXES

A. Boxes and covers are to be made of heavy gauge pressure moulded plastic and to be

manufactured for required application. Boxes to have brass threads for cover screws

fixing. Provision for securely terminating conduits are to be provided.

B. Cover plates to be heavy gauge, break resistant, made from pressure moulded

plastic.

C. Surface or recessed boxes are to be suitable for the type of related conduit system.

Sizes of boxes are to be suitable for application with switches, sockets, etc.





Wiring Devices

16140 - Wiring Devices Page 2 of 2 Date: 09/08/2014

2.3 SWITCHES

A. Switches are to be of the quick-make, quick-break type with silver alloy contacts inarc resisting moulded base. Types are as shown and described on the drawings.

B. Single pole switches are to switch the phase wire. Switches are to be mounted with

long dimensions vertical and operating handle up when in the "OFF" position.

2.4 SOCKET OUTLETS

A. Socket outlets are to have injection moulded plastic base with self-adjusting, non-

expanding contacts to prevent permanent distortion, arranged for side or back

connection with screws accepting all required branch circuit wires. Types are as

shown and described on the drawings.

1. 16 A sockets shall be compliant with ADDC2. 20 A sockets shall be compliant with ADDC.

2.5 ISOLATING SWITCHES

A. Used to interrupt loads, rated as shown on drawings, 250 V AC with tumbler

operating handle to give positive indication of "ON/OFF" position of contacts.

B. Housing: Weatherproof, IP55, made of:

1. Die cast aluminum with anti-corrosion paint for outdoor use.

2. Rigid polycarbonate for indoor use.

2.6 CONNECTORS FOR JUNCTION BOXES

A. Connectors for junction boxes shall have the following features:

1. Body made of self extinguishing material, from the polyamide.

2. Screw less connector.

3. Cage clamp technology.

4. Vibration free.

PART 3 EXECUTION

3.1 INSTALLATION

A. Locations shown on drawings are approximate. Exact locations are to be shown on

shop drawings. Switches are to be located at strike sides of doors. Unless otherwise

shown or instructed, lighting switches are to be mounted at 120cm from finish floor

level, socket outlets are to be mounted at 30cm from finish floor level.

B. All fittings are to be visually inspected for fixing, workmanship and operation to the

satisfaction of the Engineer.

END OF SECTION





Emergency Lighting System

16244 - Emergency Lighting System Page 1 of 6 Date: 09/08/2014

SECTION 16244

EMERGENCY LIGHTING SYSTEM

PART 1 GENERAL

A. The Emergency lighting system and all its components shall be designed & installed

to meet the local requirements & the respective NFPA, EN & BS Standards and local

civil defence regulations applicable on the project. The Central battery equipment

and luminaires shall be manufactured by an ISO 9000 certified company and the

products shall bear CE certification for electromagnetic compatibility.

B. Emergency lighting shall fulfil the following functions:

Illuminate the escape routes. Indicate the escape route direction clearly

Provide EXIT signs on escape doors and routes to such doors.

Ensure fire alarm call points, fire fighting equipment and other life saving

equipment on the premises are illuminated.

Permit operations concerned with safety measures & to shut down all hazardous

process

The equipment supplier shall ensure that the equipment supplied meets the following

minimum design standards:

a. Defined escape routes shall be illuminated to provide initial illumination that is not

less than an average of 10.8 lux and a minimum of 1 lux measured along the path

of egress at floor level. A maximum to minimum uniformity ratio of 40:1 shall not be exceeded.

b. Hazardous areas are illuminated to 10% of the normal lighting level.

d. In addition consideration shall be allowed to illuminate the following points of

emphasis:

Near each intersection of corridors

Near each exit door

Near each change of direction (other than on a staircase)

Near each staircase so that each flight of stairs receives direct light

Near any other change of floor level

Outside each final exit and close to it

Near each fire alarm call point

Near fire fighting equipment

Near exit and safety signs required by the enforcing authority

Near first aid points

In toilets greater than 8m2 and in all toilets for the disabled.

C. The central Battery system exists in the building. The emergency lighting and exit

lighting shall be integrated to the system.

D. Individual Luminaire monitoring

It must be possible that a defect of a single luminaires is identified as

- the individual luminaires address, the circuit address and

- the text location of the luminaires

At the integral controller/s on the panel or at the central computer/s.







2.6 SUB-CIRCUIT MONITORING & DIMMING INTERFACE

A. Where indicated final switched / dimmed lighting circuits shall be monitored foroperation & when failure is detected in supply voltage the circuit shall be

automatically transferred from normal supply to emergency supply.

B. Sub Circuit monitoring shall be provided as per the final site requirements. Any

power failure within a circuit or in a particular area or in a room shall turn the

emergency lighting on for the respective zone only. Energising the emergency

luminaries outside the areas of power failure will not be acceptable. Sub circuit

monitor shall be fully addressable for programming from the central controller or PC.

The supplier shall co-ordinate with the MEP contractor for the necessary sub-circuit

monitoring function.

C. All of the normal fittings converted for emergency use shall be fitted with anaddressable monitoring module to enable the luminaire to communicate with the

System controllers.







2.6 SAFETY & EXIT LUMINAIRES

2.6.1 General

A. Unless otherwise stated all Exit & Safety luminaires shall be operated via a Central

Battery System. All safety and exit luminaires shall be manufactured in accordance

with EN 60598-1, EN 60598-2-22 and EN 1838. The electronic ballast with

monitoring facility and easy accessible address module shall have an automatic cut-

out fuse for failures within the lamp circuit. All Exit luminaires shall have pictogram

legends as per EN 1838 and ISO 3864 confirming to local civil defence requirements

with viewing distance in compliance with the relevant standards. All of the 8watt

luminaires shall produce a minimum of 337lumen output on emergency operation

throughout the rated duration of 3 hours.

B. Safety Iuminaires shall also be operated by Central Battery System. This shall beachieved by using high frequency electronic ballasts operating at full load or by the

use of compact fluorescent lamp down lights. The ballast in compact fluorescent

lamps shall be part of normal lighting designated as emergency lighting.

C. All Exit and safety luminaires shall have a monitoring component with an easy

accessible addressing module. All luminaires shall have a built in monitoring facility.

All of the exit and safety luminaire shall be properly labelled (Red / White) with the

circuit and luminaire reference number.

2.6.2 Internal 8 Watt Emergency Luminaire (Surface mounted)

A. The luminaire shall be manufactured in accordance with EN 60598-1, EN 60598-2-22

and EN 1838. The luminaire set shall be complete with smoothed light emission

surface and quick mounting set. The luminaire enclosure made of 850°C glow wire

resistant, halogen-free Polycarbonate. Switching modes (maintained/non-maintained

and switched emergency luminaries) shall be freely programmable and mixed

operation of different modes shall be possible in a single circuit.

B. Technical Specifications

Voltage range : 230V 50/60Hz, 220VDC +25/-20%

Current drawn (battery operation) : 30 mA

Permissible temperature range : -10°C up to +40°C

Insulation class : Class IIDegree of protection : IP 41

Colour of enclosure : RAL 7035

Lamp : 8 W T16, 450 lm

2.6 .3 Internal 8 Watt Exit Luminaire (Surface Mounted)

A. The luminaire shall comply with the above specifications. In addition it shall be

supplied with three self-adhesive legend foils so that the legend can be selected in

accordance with the site requirements.


Viewing distance : 30 m







2.6.4 External 8 Watt Emergency Luminaire (Surface mounted)

A. The luminaire shall be manufactured in accordance with EN 60598-1, EN 60598-2-22and EN 1838. The luminaire set shall be complete with smoothed light emission

surface and quick mounting set. The luminaire enclosure made of 850°C glow wire

resistant, halogen-free Polycarbonate. Switching modes (maintained/non-maintained

and switched emergency luminaries) shall be freely programmable and mixed

operation of different modes shall be possible in a single circuit.


Voltage range : 230V 50/60Hz, 220 V DC +25/-20%



Insulation : Class IDegree of protection : IP 65

Colour of enclosure : Light Grey

Lamp : 8 W T16, 450 lm

2.6.5 Ceiling Recessed Watt Emergency Luminaire


and EN 1838. The enclosure shall be made of sheet steel, bezel painted with colour

RAL 9010. Switching modes (maintained/non-maintained and switched emergency

luminaries) shall be freely programmable and mixed operation of different modes

shall be possible in a single circuit.


Voltage range : 230V 50/60Hz, 220 V DC +25/-20%



Insulation : Class I

Degree of protection : IP 20

Colour of enclosure : White

Lamp : 8 W T16, 450 lm

2.6.6 Monitoring module for converted luminaires

A. Monitoring module shall be supplied with address-switches for 15 addresses in flame

retardant Polycarbonate enclosure. The unit shall be supplied for function monitoring

of loads between 4-120 W (fluorescent lamps with high frequency electronic ballast,

tungsten halogen lamps with electronic transformer and incandescent lamps).

2.6.7 Exit Edge luminaires


and DIN EN 1838. The luminaire shall be suitable for recessed ceiling mounting,

with easy re-lamping facility and plastic ceiling bezel in white colour. The luminaire

shall be supplied with integral monitoring facility. Switching modes (maintained/non-

maintained and switched emergency luminaries) shall be freely programmable andmixed operation of different modes shall be possible in a single circuit. The fitting







shall be suitable for accepting single or double sided legend panel and the exit legend

shall be selected in line with the site requirements.


Marking : Silk-screened legend

Viewing distance : 28 m

Voltage range : 230V 50/60Hz, 220VDC +25/-20%


Permissible temperature range : -10 °C up to +40 °C

Insulation : Class I

Degree of protection : IP 20

Inclusive lamp : 8 W T16, 450 Im

PART 3 – EXECUTION

3.1 INSTALLATION & WIRING

A. All of the system installation work shall be supervised by the specialist supplier.

However, the necessary containment and electrical power to support the emergency

lighting system shall be the responsibility of the MEP Contractor.

B. The cables necessary for the system shall generally be provided as recommended by

the specialist supplier and in accordance with the civil defence regulations. Wiring

between the central battery, substation panels and luminaires shall be carried out in

fire retardant Pirelli FP 200 or equivalent cable of suitable size as per the local civil

defence requirements. The individual luminaire monitoring shall be achieved without

the need for any additional data cables.

C. 3 core fire resistant cables with earth wire shall be provided to feed substations from

central battery panel. Cable size selection details must be provided based on the

electrical load of each substation.

3.2 TESTING, COMMISSIONING & HANDOVER

A. The complete installation shall be tested and commissioned by the specialist supplier

who is responsible to demonstrate the operation of the system to the satisfaction of

the Client's personnel. The supplier shall prepare fully detailed Operation andMaintenance Manuals for the system and submit to the Engineer for his approval.

3.3 MAINTENANCE

A. The supplier shall include for and be responsible for the free-of-charge regular

inspection and maintenance as recommended by the manufacturer of the complete

system for one year after the official handing over of the system.

3.4 DRAWINGS

A. Prior to commencement of any works the MEP Contractor shall prepare and submit

working drawings detailing but not limited to:a. Proposed cable routes.







b. Component layouts

c. Schematic Diagrams.

B. Prior to handing over the works, the Contractor is to supply the Engineer with four

sets of prints, one electronic copy of all "As-Built" drawings relating to the supplied

systems, four bound sets of all Operation and Maintenance Manuals for all equipment

installed.

3.5 APPROVED MANUFACTURERS

CEAG Notlichtsysteme GmBH(Germany), JSB (UK), Menvier (UK).

END OF SECTION





MV Switchgear

16363 - MV Switchgear Page 1 of 18 Date: 09/08/2014

SECTION 16363

MV SWITCHGEAR

PART 1 GENERAL

1.1 SCOPE

A. This specification covers the design, manufacturing, factory testing, marking, packing,shipping, transportation to site, installation, site testing and commissioning of 11/0.4 kVDistribution Substation equipped with the following equipment:11 kV metal-clad SF6-insulated switchgear with withdrawable vacuum circuit breakers48 V Battery and Charger

48 V DC Distribution BoardAC/DC (230 V AC/50 V DC) Adaptor, Duel rectifier with DC changeover contactors as DCSystem for the 11 KV Switchgear.CTs, VTs0.4 kV Distribution BoardDMS Interface CubicleLV Energy Meter (if applicable)Control and protection equipmentWiring up to interface cubicle for remote control and monitoring (DMS) and only thosegeneral aspects, which are, considered minimum quality and performance requirements byADDC. Further detailed and specific data are contained in the drawings, data sheets andother documents that form part of the Tender Document.

B. The 11/0.4 kV Distribution Substation equipment offered shall be complete in all respectsnecessary for their effective and trouble free operation when connected to the distributionsystem.

C. The 11/0.4 kV Distribution Substation equipment shall be installed in indoor substation withair condition.

D. For applicable technical standards, tests, reference shall be made to:

IEC 60044 - Instrument transformers

IEC 60050 - International electrotechnical vocabulary

IEC 60060 - HV test techniques

IEC 60068 - Environmental testing

IEC 60071 - Insulation co-ordination

IEC 60137 - Bushings for AC voltages above 1000 V

IEC 60255 - Electrical relays

IEC 60265 - HV switches for rated voltages above 1 kV and less than 52 kV

IEC 60270 - Partial discharge measurements

IEC 60352 - Solderless connections





MV Switchgear


IEC 60364 - Electrical installation of buildings – Protection for safety and protection against electric shock

IEC 60445 - Identification of equipment of termination of certain designconductors including general rules for an alpha-numeric system

IEC 60466 - AC insulation enclosed switchgear and controlgear for rated voltagesabove 1 kV and up to and including 38 kV

IEC 60529 - Degree of protection provided by enclosures (IP Code)

IEC 60664 - Insulation coordination for equipment within low-voltage systems

IEC 60694 - Common specifications for HV switchgear and controlgear standards

IEC 60750 - Designation of equipment and control cubicles

IEC 60865-1 - Short-Circuit currents – Calculation of effects

IEC 61000 - Electromagnetic compatibility (EMC)

IEC 61128 - AC disconnectors bus-transfer Current switching by disconnectors

IEC 61129 - Alternating Current Earthing Switches – Induced current switches>52kV

IEC 61166 - HV AC circuit breakers – Guides of seismic qualification of high-voltage alternating current circuit breakers

IEC 61243-5 - Voltage detection systems

IEC 61936-1 - Power installations exceeding 1 kVac – Common Rules

IEC 61958 - Voltage presence indicating system

IEC 62063 - HV switchgear and controlgear – The use of electronic and associatedtechnologies in auxiliary equipment of switchgear and controlgear.

IEC 62194 - Method of determining enclosure thermal performance by theinfluence of internal heat load and sun radiation

IEC 62271 - HV switchgear and controlgear

Part 100 - HV alternating-current CB`s

Part 102 - HV Alternating current disconnectors and earthing switches

Part 107 - Alternative current fused circuit switchesfor rated voltages above 1kV up to and including 52 kV

Part 200 - A.C. metal-enclosed switchgear and controlgear for rated voltagesabove 1 kV and up to and including 52 kV

BS 3692 - Isometric precision hexagon bolts, screws and nuts

BS 3382 - Electro-plated coating on threaded components

BS 6121 - Mechanical cable glands

IEEE C37.122 - Seismic qualification





MV Switchgear


PART 2 PRODUCTS

2.1 GENERAL

A. The 11/0.4 kV Distribution Substation equipment ratings shall be as specified in theTechnical data Sheets.

B. The 11/0.4 kV Distribution Substation equipment shall be capable of withstanding theelectrical and mechanical stresses as specified in the Technical Data Sheets and in theStandard Technical Specification, Part: General Technical Requirements

C. The highest degree of uniformity and interchange ability shall be attained. The design shallfacilitate easy maintenance, fault diagnosis and repair of the components.

D. Cast iron shall not be used for any part, which may be subjected to mechanical shock.

E. Materials shall wherever possible, be non-hygroscope and non-flammable. Insulatingmaterials shall have a high resistance to tracking.

F. A mimic diagram of suitable size showing incoming/outgoing 11 kV feeders shall be provided at prominent places.

2.2 11KV SWITCHGEAR

A. General Arrangement and Construction

The Switchgear shall be suitable for mounting on a concrete floor. All necessary fixing boltsand rails shall be provided.

The Switchgear shall be of the metal clad SF6-insulated indoor type complying with IEC62271 as a minimum requirement unless specified to the contrary in the Specification.

The Switchgear shall be of the self-supporting bolted construction with all equipmentinstalled inside vertical steel structures, suitably sub divided into individual compartmentsfor:

1. Busbars2. Circuit breaker3. Cable sealing ends & CTs4. Bus Bar VT.

5. Protection & metering.Metal enclosures shall be made from arc-proof sheet steel, offering mechanical and thermal

properties suitable for prevailing application.

The equipment in the 11 kV Switchgear compartments must be accommodated withnecessary clearances, easy access to the equipment for testing, maintenance, removal andnormal operation and to provide safety measures against all possible hazards to theequipment in the particular compartment, such as internal arcing faults.

The enclosure of the 11 kV Switchgear must be so designed that internal arc faults aredirected away from places where personnel or public may be present.

The 11 kV Switchgear of similar ratings/model/type shall have the same dimensions andcomponents. The devices shall be interchangeable with those of other units.





MV Switchgear


The 11 kV Switchgear shall be equipped with one set of three phase busbars. The circuit breakers shall be ‘VACUUM” and have approved means of isolation.

The 11 kV Switchgear shall also incorporate earthing facilities for each set of busbars,achieved by either suitably interlocked earthing switches/devices or other approved method.

The equipment shall be dust-proof, rodent and insect proof. It shall be capable of operatingin tropical and humid conditions and provision shall be made for electric heaters to preventcondensation, particularly when the equipment is out of service.

The Switchgear shall be designed for automatic pressure relief in case of pressure build updue to arcing, at the same time, ensuring that escaping gases are clear off the operating

personal in the front and rear of the Switchgear. Any devise for pressure relief shall undernormal service be absolutely vermin, dust and damp proof.

Complete protection shall be provided against approach to live parts or contact with internal

wiring parts. Particular attention shall be paid to drive linkages, bushings, earth bars and thelike to ensure that the enclosure classification is not reduced when these pass throughcompartments.

Adequate clearances and surface creepage distances shall be provided to ensure satisfactory performance under service conditions.

In order to make the type of Switchgear compatible with the arrangements familiar toADDC, the busbars shall be contained in a busbar chamber, which shall be positioned

physically above the cable box.

Suitable potential indicators shall be provided at each feeder.

For busbar voltage measurement withdrawable busbar VTs shall be installed (top mounted).

Connection to busbar shall be through HV protection fuse. Secondary circuit shall be protected through MCB. ADDCs Standard Specifications for VT shall apply.

The 11 kV Switchgear shall not exceed Noise and Radio Influence Voltage Levels asspecified in Technical Data Sheets.

The 11 kV Switchgear shall be checked after assembly to ensure that no rattling ofindividual components occur.

11 kV Switchgear shall be designed to ensure that thermal interaction does not unduly affectthe performance of any of the components.

All 11 kV Switchgear metal works, including cable screens shall be securely bondedtogether in such a way that a firm metallic connection exists between each component of the

substation metal work and the 11/0.4 kV Distribution Substation earthing system.All wirings shall be labelled at the terminal and equipped with approved tags.

B. Busbars

Each busbar shall be of hard drawn high conductivity copper and shall be covered with PVCsleeves. Silicone Rubber insulated Bus-Bar is acceptable. The single busbars shall bearranged to permit future extensions. The method of extension has to be described clearlyand shall be shown on a drawing. Provision shall be made for extending the busbar at eitherend without any need for cutting or drilling the busbar.

C. Low Voltage Equipment Compartment

1. General Arrangements





MV Switchgear


The low voltage equipment compartment, provided as part of the switchgear andmounted on the feeder switchgear panels, shall be completely metal enclosed and

shall be provided with a separate front access door. If protective relays are mountedinside this compartment, it shall have a door with a window to allow the observationof relays. Wiring to door mounted equipment shall run inside flexible conduit,suitably mounted to prevent stressing of the conductors when opening the door to itsextreme stop.

All wirings shall be labelled at the terminal and equipped with approved tags. 2. Indicating Lamps

The following indication lamps shall be provided:

Earth Switch ONEarth Switch OFFProtection Relay FAILURE

Any MCB TRIP CB IN SERVICECB IN TESTA common switch shall be provided in an approved location so that all normally litindicating lamps’ can be switched off.A common push button for all lamps testing shall be provided . Indicating lamps fitted into the fascias of switch and instrument cubicles or panelsshall be adequately ventilated.Lamps shall be easily removable and replaceable from the front of the panel and shallnot be requiring the use of extractors.The bezel of metal or other approved material holding the lamp glass shall be of anapproved finish and be easily removable from the body of the fitting so as to permitaccess to the lamp and lamp glass. The lamps shall be clear and shall fit into anaccepted standard form of lamp holder. The rated lamp voltage shall be 220% of thenominal auxiliary supply AC voltage, low voltage lamps with series resistors will beacceptable.The color shall be in the glass and not an applied coating and the different coloredglasses shall be interchangeable. Transparent synthetic materials may be used insteadof glass, provided it can be shown that such materials have fast colors and arecompletely suitable for operating in topical climates.MCBs shall be provided in indication circuits.The variety of indicating lamps provided shall be rationalized to reduce maintenanceand spares requirements.

3. Fuses and LinksFuses shall be of the high rupturing capacity cartridge type; (rewirable type fuses willnot be accepted). Fuse holders shall be designed to lock the cartridge firmly into

position without the use of screw clamping devices.Carriers and bases for 16 amp fuses shall be colored green and those for 6 amp fusesshall be black. Link carriers and bases shall be white or another distinctive color.Miniature circuit breakers may be offered in lieu of fuses in ac circuits. All colorsshall be subject to the approval of ADDC.

D. Interface Cubicle

A remote control interface cubicle for data dispatching and switching from the DistributionManagement System (DMS) shall be provided, to accommodate the required interfacewiring for all 11 kV switches, earthing switches, and circuit breakers, analogue information,alarms and protection trips. The required cubicle shall be suitable for operation under the





MV Switchgear


prevailing environmental site conditions. Each panel to be equipped with Local/Remoteswitch in interface cubicle. Wiring between the Switchgear and the Interface Cubicle shall

be provided as specified in the signal list for distribution substation.

E. Circuit Breaker1. General

The circuit breakers shall be of the withdrawable type with horizontal isolation fromthe fixed busbars and outgoing circuit connections.

2. Making and Breaking CapacitiesEach circuit breaker shall be capable of making and breaking short-circuit faults asspecified in the Technical Data Sheets.

3. Vacuum TypeOnly “vacuum” circuit breakers with totally enclosed and maintenance free contact

systems will be accepted.

Circuit breakers of the vacuum type shall incorporate contacts designed to ensure along contact life at all currents up to the rated making and breaking current switchingconditions. Contact material having low current chopping levels are preferred tominimise the occurrence of excessive overvoltages when switching.

If additional devices are required to limit overvoltages caused during switching to asafe level, these shall be supplied and the details shall be described in the Bid.

Contact material properties shall be such that the required dielectric strength acrossopen contacts is obtained at all times.

Transmission of high mechanical stresses to the vacuum enclosure during operationshall be reduced to the minimum possible by the use of resilient mountings. Featuresto prevent the application of abnormal stresses to the flexible seals shall beincorporated.

Means for measurement of contact wear without major dismantling shall beincorporated and an appropriate gauge shall be provided.

The details of any vacuum monitoring facilities shall be described in the Bid.

If possible, any one vacuum bottle should be able to be removed without having toremove any of those on the other two phases.

4. Operating Mechanisms

Circuit breaker operating mechanisms shall be of the 48 V, DC motor wound springtype.It shall be possible to charge the spring with the circuit breaker in either the “open” or“closed” positions. It shall not be possible for the circuit breaker to close unless thespring is fully charged. A visual indicating device, preferably mechanical shall be

provided to indicate the state of the spring. The device shall indicate “SPRINGCHARGED” when the spring is in a condition to close the circuit breaker and“SPRING FREE” when the spring is not in a condition to close the circuit breaker. Ifa charged spring is released when the circuit breaker is closed, the circuit breakershall not open and neither shall such operation result in damage. Indication lamps toindicate spring charged shall be provided where specified.

The mechanism shall be fitted with a local manual spring release, preferably a push

button, shrouded to prevent inadvertent operation and provided with means for padlocking. Operation counters shall be fitted to all circuit-breaker mechanisms.





MV Switchgear


Same spring(s) shall be applied for manual/electrical (through motor) operations offeeder switches.

Motor charging of the spring mechanism shall be fitted with a D.C. motor.Recharging of the mechanism operating spring shall be commenced immediately andautomatically upon completion of each circuit breaker closure. An emergency handoperated charging device shall be supplied manual charging of spring mechanism.A contact shall be provided to initiate a “Breaker Alarm” if the operating spring is notrecharged within a predetermined time.The operating mechanism shall be designed so that the circuit breaker is free to openimmediately when the trip coil is energized. A direct acting mechanical trip via anemergency button shall be provided on each breaker.Circuit breaker trip coil shall be series trip release type.Means shall be provided for the manual operation of all circuit breakers formaintenance purposes.An approved positively driven mechanically operating indicator shall be provided toshow whether the circuit breaker is open or closed.In the event of failure to latch in the closed position it shall not be possible for thecircuit breaker to open except at normal speed. Means shall be provided for slowclosing of the circuit breaker for maintenance purposes. It shall not be possible to usethis device when the circuit breaker is in the service position. An approvedarrangement shall be provided to prevent repeated reclosures in the event of a

permanent close signal being present.It shall not be possible, without the use of special tools, to gain access to the trippingtoggle or any part of the mechanism, which would permit defeat of the mechanicaltripping feature.

It shall not be possible to render the electrical protection tripping feature inoperative by any mechanical locking device.It shall be possible to complete the closing, tripping and interlock circuits when thecircuit breaker is isolated in order to permit operation for tests purposes. Theinterlocks of the circuit breaker when in the isolated position shall be arranged to

prevent interference with associated interlocks on circuits in service.A LOCAL/SUPERVISORY switch shall be provided for each circuit breaker.

Operating mechanism for feeder and transformer control switches shall include thefollowing electro-mechanical DMS interface facilities:

- Internal ON/OFF position of all switches (feeder & transformer)- Switch for LOCAL & REMOTE Operation (ON/OFF) manually and

electrically with the provision for motor installation facility on theexisting mechanism without any modification.

- For feeder switches electrical ON/OFF control switches (local and remote positions) shall be provided including all wirings.

- Provision of lever switch/contacts incorporated with mechanism of feederand transformer switches for indicating ON/OFF positions.

5. Isolating Contacts for Secondary Circuits

Means shall be provided for connecting the secondary circuit on the moving portionwith those on the fixed portion of the equipment. These connections shall bemaintained for all positions of the circuit breaker. A set of self-aligning contacts shall

be provided in the secondary connections between the fixed and moving portions to permit ready disconnection in the event of complete withdrawal of the moving portionof the equipment.





MV Switchgear


Secondary circuits on the moving portions of circuit breaker equipment of equalcurrent rating shall be identical in order to permit interchangeability.

F. Protection Scheme1. 11 kV

- GeneralRelays shall be of approved type and comply generally with the requirements ofIEC 60255 and other approved standards and shall be contained in dust proof,moisture proof flush-mounted cases with transparent fronts and semi gloss black

bezel; and shall be provided with breathers.

Test plugs to suit each different type of relay or test socket shall be provided foreach switchboard or set of relay panels. The test plugs shall have terminals for

both the relay and wiring side connections, which shall accept, both wires and plug

connectors, and shall be supplied with a flexible cable for connection to a portablerelay test set.

All relays shall be arranged in such a way that any dust, which may have collectedin or upon the relay housing shall not fall on the relay mechanism when openingthe housing.

Auxiliary relays shall also be mounted in dust proof cases.

All protective relays shall be provided with a name and data plate of approvedstandard, which shall include the ratios of the associated current and/or voltagetransformers.

All metal bases and frames of relays shall be earthed, except where the frame must be insulated for special requirements. An earth terminal shall be provided on the back of the relay case.

Each relay which initiates tripping shall be provided with a trip isolation facilitywhich should be integrated into the relay in such a way that the tripping has to beisolated prior to withdrawal of the relay from its housing.

All relays which are connected to the tripping circuit of a circuit breaker or to thecoil circuit of an auxiliary tripping relay shall be provided with approved operationindicators which, whenever possible, shall be of the mechanically operated type.Indicators shall also be provided on such additional relay elements to enableidentification of the faulty phase.

Each indicator, whether of the electrically operated or mechanically operated type,shall be capable of being reset by hand without opening the relay housing andrelay operation shall not be possible whilst resetting the operating indicator. Eachindicator shall be so designed that the status is not shown before the relay hascompleted its operation. Indicators shall not reset during a failure of auxiliary

power to the relay.

It shall not be possible to operate any relay by hand without opening the case.

Unless otherwise specified, the current circuit for the relays shall be suitable for 1A, 50 Hz and voltage circuit shall be rated for 63.5 V, 50 Hz (Ph-N) or 110 V by,50 Hz (Ph-Ph).





MV Switchgear


The maximum ac fault voltage across any two points of a current circuit shall notexceed 3000 volt peak and non-linear resistors shall be included if necessary to

achieve this limitation.

If bolts or nuts are so placed as to be inaccessible with an ordinary spanner, notless than 2 suitable special spanners shall be provided.

All calculations to determine relay settings and adequacy of CT and VT ratingshall be submitted to ADDC for approval. In the event that the rating of the VT orCT proposed is insufficient to handle the connected burden in accordance with thisspecification, the Bidder/Contractor shall supply the CT and VT with thenecessary increased capacity and ratio at no extra cost.

The Bidder/Contractor shall provide electrical protection relay schedules includingmanufacturer, type designation, characteristic details and ranges and actual

protection settings to be used, on a per circuit basis.All protection relays offered shall have been fully type tested in accordance withthe appropriate standards and shall have had satisfactory operational service.Comprehensive data’s related to these requirements shall be submitted with theBid.

- Protection of 11kV incomer cables1) Directional Over-Current and Earth Fault Protection

A three-phase O/C and one E/F numerical protection to detect inter-phase and phase to ground faults shall be provided. The tripping characteristics shall beselectable; either a definite time characteristic or a large number of inversetime characteristics, according to IEC-60255 and BS-142.

Relays shall be supplied with front and rear ports equipped withcommunication software for local/remote access of data and parameterdownload.

HMI-keypad facilities shall be provided for local access to setting, monitoringand disturbance data shall also be provided.

The current setting ranges shall be at least for over-current 20% to 200% ofI N, in steps of 10% or less and for earth fault 10% to 80% of I N, in steps of 5%or less. The high-set element shall have a setting range of 200 percent to 3000

percent of nominal. The tripping time of high-set elements should be within20 ms.

Each of the protection elements shall have separate trip and alarm contacts,and a separate trip indicator.

Over-current and earth fault protection relays shall be provided for all 11kVcable feeders, 11kV bus section, power and auxiliary transformers. The relaysshould be designed to cater the feeder requirements, for example secondharmonic restraint feature should be available on the transformer feeders.

Selectable Directional feature should be available on all overcurrent and earthfault relays.

2) Line Differential Protection (on both sides of new circuits with FO cables) This protection system shall be based on percentage biased current

differential principle, which shall be capable of clearing all faults within the





MV Switchgear


protected zone, and maintaining stability against all kinds of through faultcurrents up to the magnitude of switchgear fault rating.

The protection shall be of numerical type and phase-segregated.

The fault detection principle shall be independent of power swings. Faultsnear weak infeeds shall be detected as well as faults near high-energy centers.

The differential protection shall be designed with exchange of digitalinformation pertaining to the magnitude and phase angle of fault currentsflowing at both ends of the feeder through the fiber-optic interface.

Fiber-optic interface equipment shall be provided with all necessaryaccessories. This shall include repeaters as required for use on longtransmission lines.

The conceptual design of the protection shall be unaffected by: Zero sequence mutual coupling Sudden power reversal Cable charging currents Interaction of fault resistance and sources feeding with different fault

angles producing misleading measurement of reactance Collapse of voltage on the faulted phase(s) External switching phenomena Power frequency variations.

Close-in high-current faults shall be cleared instantaneously and the relaymay trip the breaker without information from the remote end. Also,measuring algorithms to provide switch-onto-fault facility shall be included.

The design shall have the ability to provide on-line monitoring and self-checkfacilities to monitor the state of health of the entire protection system.

Hardware and software shall be checked by software sub-routinecontinuously. Important components supervised shall include:

CPU’s and associated Memory (ROM, RAM, EEPROM) Input Signal Validity (A/D Converter) OS Software Protection Functions Software Communication System Software Watchdog and Self-Monitoring Software Output Signal Integrity Interference Noise Level Algorithm Execution/Logic Performance Analogue Measuring System Digital Input conversion System I/O Logic Points Power Supply Noise/Failure Internal Clock.The relay shall further have the following facilities: Serial interfaces for on-line and off-line transmission of relay

operation data, feeder load data, fault recording, remote settingand remote test initiation

Storage facility for on fault information for at least the latestthree system faults, giving on demand relay operations, operatingtimes, load data, etc.





MV Switchgear


Serial interface facility to a PC for further data exploitation withthe required software for this purpose.

The scheme shall be provided with thermal O/L built-in high-speed backup protection elements:

In the case of loss of signal transmission over fiber optic cables, thedifferential measurement function shall be automatically blocked. Therelays shall be allowed to work with backup O/C and E/F functions.

- 11/0.4kV Transformer Protection1) Directional Over-Current and Earth Fault Protection

The CB for Transformer Feeders shall be fitted with three protection classCT’s, rated 5P20 or better and three metering CT’s, class 1 as per CT & VTspecification for MV switchgear Clause 2.5.5.1 and applicable ADDC

Technical Standard Specification S-SWG-MV-VTCT. The secondary circuitfor protection CTs shall be connected to (IDTM) O/C and E/F numerical relaysupplemented with instantaneous functions.

To guarantee the correct operation of connected protection equipment,through fault stability calculations shall be submitted showing the sufficiencyof the chosen CT cores, i.e. rated output, rated accuracy limit factor, rated

primary current, knee-point e.m.f and resistance of the secondary windings(corrected to the maximum service temperature).

The O/C and E/F Protection Relay shall be designed to closely follow thecharacteristics:

Withstand transformer inrush currents

Permit transformer overloads To be co-ordinated with time/current characteristics of HRC

fuses (if applicable) for down-stream feeder protection.Time/current characteristics and a schematic diagram shall be submitted with theBid.

The O/C and E/F relay should be housed in a suitable housing shall have frontconnections and shall be accessible from the front.

Alternatively a built in control supply arrangement may be provided to trip the breaker.

The protection curves and all other settings shall be adjustable through micro-switches which when viewed from the front clearly show the unit settings. The

protection setting range and minimum pick up current shall be in accordance withthe protection of 500 to 2000 kVA transformers.

The O/C and E/F relay shall provide local indication of a fault operation.

It should be possible for the relay to perform a self-check giving clear indication ofthe status of the over current and earth fault elements.

The O/C and E/F relay shall have facility of historic fault information with time,date and fault records. The CT circuits to the O/C and E/F relay shall be routedthrough the test terminal blocks and also tripping circuits from O/C and E/F relayto the CB. DC supply for numerical O/C & E/F relay to be routed through test

block. The numerical O/C & E/F relay shall have output constants as required by

DMS signal list





MV Switchgear


Other auxiliary relays with flag indication to give trip/alarm in case of transformer protections such as oil temperatures etc. shall be provided.

2) Numerical Stand-By Earth-Fault Relay (Not applicable)A stand-by earth fault relay having the same curve specification like the O/Cfunctions shall be provided. The stand-by earth-fault relay shall be located inthe transformer control panel of 11kV switchgear and CT for stand-by earth-fault protection shall be integrated in 0.4 kV distribution board, CT shall belocated on the neutral busbar between neutral cable connection and link toearth busbar.

The earth fault function shall have current ranges from 20% to 80%,adjustable in steps of 10% or less.

The IDMT and instantaneous functions provided for the earth fault protection

also shall have separate trip and alarm contacts and separate trip indicators.The Stand-by Earth Fault relay shall be powered by 48 VDC.

G. Isolator cum Earthing Switches (for GIS)

Means to safely isolate and ground any feeder breaker of the Switchgear shall be provided.Motor-operated combined isolator cum earthing switches suitable electrical and mechanicalinterlocked with the breaker shall be provided.

Isolator cum earthing switches shall be designed to withstand the rated and fault current ofthe largest breaker interrupter element that can be fitted into the Switchgear.

The three-way switches must have definitive stops at their "ON", "ISOLATED" and

"GROUNDED" positions, with no direct movement from the "ON" through the"ISOLATED" into the "GROUNDED” position.

View-ports or mechanical indicators connected directly and permanently to the operatingshaft are required to positively display the actual switch position. Indirect position indicatorsare not acceptable.

Power operated drives shall be provided which shall be suitable for local, remote and DMScontrol and should be fitted with a removable emergency manual operation facility.

H. Interlock System (for GIS)

The interlock system must positively prevent an operator from reaching or creating

unintentionally a dangerous or potentially dangerous condition. Systems that can be bypassed without the use of tools and/or force are not acceptable.Specifically the following conditions must be impossible to reach:

- Electrically and manually operating the breaker with the isolator cum earthingswitch not fully engaged in any of its three positions.

- Electrically and manually closing or opening of the isolator cum earthing switchwhilst the breaker is closed.

- Electrical interlocks shall be provided as specified, particularly for the incomingfeeders and the bus-tie breakers.

- When the manual emergency cranks are used, it shall be impossible to control thedevices electrically.

- At the optical output of the capacitive voltage indication devices a no-voltage

relay for interlocking shall be provided.- CLOSING of earth switch when the power cable is energised





MV Switchgear


All breakers for remote and/or DMS control shall have a local cut-out switch of thekey-operated type allowing selection of the operation modes as applicable.

I. Locks and Padlocks

Provisions for padlocks and padlocks shall be provided on the Switchgear.

Padlocks shall be provided as listed below (three ordinary keys for each lock shall besupplied).

- Locking the isolator cum earthing switch in the isolated and earthed position- Locking the C.B. control switch- Locking the Local/Supervisory switch.

Six (6 Nos.) master keys to fit all types of control and lock switches shall be provided foreach 11/0.4 kV substation.

Suitable wall mounted metal cased key cabinet shall be provided. In each key box provisions shall also be foreseen to keep permit books and danger boards.

J. Floor Inserts

Where metal inserts or rails are required in the floors for constructing the panels or guidingthe circuit breakers into position, these rails shall be included in the Contract. It shall be

possible to remove/install the circuit breakers from/into the fixed portion without the aid ofspecial portable ramps or the like.

K. Voltage and Current Transformers

Concerning voltage and current transformer specifications and technical data, reference shall

be made to Standard Technical Specification, Part:

L. Cable Boxes

Cable boxes shall be adequately sized to accommodate air-insulated heat shrinkable typeterminations.

The minimum distance between the lower end of the cable socket and the inner face towhich the gland is bolted shall be that required to effect the necessary clearances incompliance with the requirements of the heat shrink cable terminations used and in any casenot less than 450 mm. Above this face there shall be no projection which restricts thespreading of the cores of the cable.

The cable box shall be positioned below the busbar chamber and shall completely enclose

the cable above the switchgear room floor.

Cable glands shall be suitable for 11 kV, 3 Core, XLPE insulated, Double Steel TapeArmour, PVC Served Cables, cable size range 95 to 300 mm² Copper. Gland plates, unlessotherwise specified, shall have glands pointing vertically downwards.

Each panel shall be supplied complete with Heat Shrinkable/Plug-In Termination Kit of anacceptable and approved make, Cable Lugs support glands, etc. The termination kit shall besuitable for 95 mm² for Transformer Feeder and 185, 240 or 300 mm² for Cable Feeder.

M. Earthing of Metal Parts

All metal parts of the switchboard and integral earthing features shall be directly connected to

a copper earth bar, which shall run along the full length of the switchboard.





MV Switchgear


The cross sectional area of the earth bars shall be sufficient to carry the rated short timewithstand current of the switchgear for the time specified.

The frame of draw-out circuit breakers and earthing trucks shall be automatically connected tothe switchboard earth bar through substantial plug type contacts.

N. Corona

The equipment shall be designed in such a way to minimise corona or other electricaldischarge and radio interference.

O. Switchgear Space Heater

Each switchgear compartment shall be equipped with a space heater, fed from a separate power source (regardless of the position of the 11 kV CB (ON or OFF) position. The spaceheater shall be protected by a two-pole MCB with auxiliary N/C contact wired to a groupalarm terminal and shall be equipped with sensors for temperature and humidity control. Theheater shall be located at a suitable position and its capacity shall be as required to maintainthe interval temperatures above the dew point taking into consideration the specifiedenvironmental conditions. A switch for each heater shall be provided so that the heatercircuit can be switched “ON” or “OFF” as required independently. The heating elementsshall be installed vertically, with minimum all round clearances of 50 mm and shall meetrequirements as specified in the Technical Data Sheets.

P. Labels

Each panel of each switchgear shall have a blank circuit label approximately 30 cm x 8 cmmounted on the front of the panel in a prominent position. These labels shall be made of

suitable engraving material approximately 2 mm thick, white surface with black engraving.Small black labels of similar material shall be mounted on the rear of the panels. The circuitnames will be engraved at site by ADDC.

Q. Fault Current Indicator

Through fault current indicator with ring/split core-balance CT shall be provided on incomerfeeders only.

It shall be fixed flush mounted on the access door, in such a way that it can be seen througha window without opening the door.

The through fault current indicator shall operate while passing a fault current through theCT.

The through fault current indicators shall be of the automatic re-set type, i.e. the indicationshould re-set to the normal position as soon as the system is back to normal condition, can

be offered.

The required power supply shall be described in details. Power supply from other than CT orAC auxiliary supply will not be accepted.

The indicator shall also have provision for remote indication and shall be complete with allnecessary components including cabling.

R. 11kV Voltage Detectors

11 kV plug-in type voltage indicators with three glow discharge lamps to indicate phases

“ALIVE” shall be provided at each outgoing/incoming and transformer feeder. The voltage





MV Switchgear


detector (capacitor Type) shall be connected to each phase on the circuit side. The glowdischarge lamps are to be located on front of the panel.

2.3 POWER CIRCUITS, CONTROL, PROTECTION & TELECOMMUNICATION WIRING

A. In selecting cable and wire sizes, due regard shall be paid to the appropriate de-ratingfactors in relation to the climatic conditions at site. All cables and wires shall continuouslycarry their rated currents under the worst temperature conditions, which prevail in summer,and shall also withstand maximum fault currents without damage or deterioration.

B. All secondary copper wiring within panels, boards, etc. shall be in accordance with therelevant IEC standards, it shall be carried out for the fully rated distribution voltage (2 kVAC/ 1 min. test voltage), and shall consist of copper wires. The bare ends of stranded wiresshall be provided with squeezed sleeves.

C. Secondary wiring to be performed at Site shall enter the terminal block at one side only.The panel wiring shall terminate in one or more terminal blocks accommodated at the sideor bottom.

D. Generally for wiring, the cable tails shall be so bound that each wire may be traced back toits associated cable without difficulty.

E. Extra 20% spare terminals of each type shall be provided.

F. Minimum size shall be as specified in Technical Data Sheets.

G. All wiring shall be properly supported, neatly arranged, readily accessible and securelyconnected to terminal blocks in such a manner that wherever practicable, wiring can beeasily checked against diagrams.

H. Internal terminations of standard conductors shall be made with solderless crimping typetinned. Copper lugs which shall firmly grip the conductor, or by an equally suitablemethod. Insulating sleeves shall be provided over the exposed parts of lugs.

I. Engraved core identification ferrules marked to correspond with board wiring diagramshall be fitted at both ends of each wire.

J. Separate ferrule numbering and identification shall be attached to the wires connecting the protective relays, even if the numbering and identification are printed on the wiresthemselves.

K. As far as possible, all circuits shall be run along the shortest path to their addresses butshall be run only in horizontal and vertical planes. Diagonal runs are not acceptable.

L. However, the wire runs shall not block access for ready test or removal of any devicewithout disturbing other devices.

M. If wiring is provided to equipment installed on doors, bundled conductors shall be used onthe hinged doors with extra/flexible wire, so arranged that a twisting rather than a bendingmotion, is imparted to the moving bundled conductors. Each bundle shall be anchored suchthat the moving bundle length is the maximum available without loops.





MV Switchgear


N. Conductors between terminal blocks and apparatus shall be laid in plastic ducts or coveredwith plastic bands.

O. All power circuits, control and protection wiring and low level signal wiring shall be physicallyseparated. Separate laying-way shall be provided for power cables, and the working voltage ofeach power circuit shall be marked on the associated boards.

P. Conductor ends not connected to compression-type terminal blocks shall be provided withapproved claw-washers, which neatly retain all strands, "Push-on" or "quick" type connectorsshall not be used for current transformers and trip circuits. These connectors maybe used foralarm and control system and within an equipment assembly only. Sample of any suchconnectors shall be submitted for ADDC ´s approval.

Q. Wiring shall be arranged to give easy access to the terminal or relays and other apparatus.

R. Soldered or wire strapped connections shall only be inside electronic systems. Any wirewrapping shall be in accordance with IEC Publication 60352.

S. As far as reasonably possible, all outgoing wiring shall be grouped by function (CT, VT,Trip, Alarm, etc.) with those going to a common destination allocated to adjacent terminal

blocks. Terminal block configuration shall be submitted for ADDC’s approval. Labels shall be provided on the fixed portion of the terminal boards showing the function of the group.

T. Insulating barriers shall be provided between each group of power circuit terminals and between the terminal categories as applicable. The height and spacing between the barriersshall be such as to give adequate protection to the terminals.

U. Connections for indicating instruments, and for the telecommunication circuits fromtransducers, or modem outputs, shall use individually shielded wire pairs. One (1) extraterminal per pair of terminals shall be provided to connect this shield to ground.

2.4 CORROSION PROTECTION

A. The Switchgear shall be treated and protected to withstand at least five years of operationafter FAC under the site conditions without sustaining significant corrosion or attacks fromfungus or rodents, provided the surfaces remain mechanically undamaged.

B. The manufacturer’s standard corrosion protection may be acceptable subject to the approval by ADDC.

C. Manufacturers standard paint color shall be used, but a light grey finish with high scratchresistance is preferred.

D. All hardware used in the assembly of the Switchgear must be either of corrosion proofmaterial, or be hot dip galvanized.

E. For Corrosion Protection measures, reference shall be made to section 16035

F. A detailed Corrosion Protection/Painting description shall be submitted with the Bid.





MV Switchgear


PART 3 EXECUTION

3.1 INSTALLATION

A. Install work as specified, as shown on the drawings, to the satisfaction of the Engineer, andin accordance with local relevant authorities’ regulations.

3.2 TESTING AND INSPECTION

A. GENERAL1. The 11/0.4 Distribution Substation equipment shall be subject to inspection and test

during manufacture and after the completion by ADDC.2. Testing of each equipment shall be according to IEC Standard 62271 as a minimum

requirement.

3. Type Test Certificates shall be submitted with the offer.4. Acceptance by ADDC’s representative of any equipment shall not relieve the

manufacturer from any of his performance guarantees or from any other obligations.5. Test Certificates for each equipment shall be submitted prior to delivery.6. The various components of the 11/0.4 kV Distribution Substation shall be inspected

visually prior to any test in accordance with the list of defects set forth below:

B. Material1. Parts not made of material as specified2. Any component missing or damaged.

C. Finish1. Dirt, grit or foreign matter embedded in finish2. Painting work not in order3. Pits, cavities on the surface of components and busbars. The contact surface

of switches and breakers not being smooth and uniform in thickness4. Steel parts rusted.

D. Construction1. Construction of any major components not as per specification or good engineering

practice2. Nuts and bolts not tight3. Nuts not freely moving or loose on threads

4. Doors of the housing do not fit properly5. Welding not proper6. Locking arrangement not proper7. Earthing straps between doors and housing not of adequate size8. Marking/Name Plates9. Caution notices missing, not legible, incomplete or not permanent

3.3 FACTORY TESTS

A. Type Tests (Only applicable for Pre-Qualification):1. Dielectric tests2. Temperature rise tests

3. Measurement of the resistance of the main circuit4. Making and breaking tests





MV Switchgear


5. Rated peak withstand current and rated short-time current tests on main and earthingcircuits

6. Short-circuit test procedure7. Capacitive current switching tests8. Operation & mechanical endurance tests.

B. Routine Tests1. Power frequency voltage tests2. Voltage test on auxiliary circuits3. Measurement of resistance of main circuits4. Operation tests5. Continuity with diagrams (scheme check)6. Measurement of closing and opening speeds and times7. Measurement of operating torque8. Checking of partial discharges on individual components9. Dielectric testing and main circuit resistance measurement.

C. Sample Tests:1. The following sample (or quality acceptance) tests shall be carried out in the presence

of ADDC on the selected samples of 11 kV Switchgear.a. Verification of dimensions of various components including thickness of

mild steel sheets and paint b. Functional tests of all major components according to the Specifications and

relevant IEC standards.

D. Site Tests:1. The 11/0.4 kV Distribution Substation supplied should be suitable for specified

functions illustrated in this specification unless otherwise approved by ADDC.2. The Bidder/Contractor shall carry out electrical and function tests when installation of

the 11/0.4 kV Distribution Substation has been completed.3. The tests shall comprise but not limited to the following:

a. Visual and wiring checks for the equipment installation & wiring b. Power frequency voltage testc. Insulation resistance testd. Secondary/Primary Injection teste. Relay testf. Checking of proper annunciation system operation

g. Calibration and adjustment of instrumentationh. Interlocking checksi. Functional checks on Control, Protection and Monitoring Equipment.

4. The scope of the tests should be finalized and submitted to ADDC for approval priorto implementation.

END OF SECTION




Division 16: Electrical

MV (11 kV) Switchgear - Data Sheet

SECTION 16363


Sl. No. REQUIRED TENDERED

1.00 GENERAL

1.01 Applicable standards IEC 62271-200

1.02 Type test

1.02.1 carried out yes/no

1.02.2 date dd-mm-yy

1.02.3 testing laboratory

1.02.3.1 name

1.02.3.2 country

1.03 Type

1.04 Commercial operation time of offered switchgear years 3

type

2.00 CONSTRUCTION DATA

A. Switchgear

2.01 Manufacturer

2.01.1 name

2.01.2 country of manufacturing

2.02 Enclosure

2.02.1 material

2.02.2 arc-proof yes

2.02.3 degree of protection IP 68

2.02.4 color RAL 7032

2.02.5 Rated gas pressure at 20°C bar abs.

2.02.6 Minimum gas pressure at 20°C bar abs.

2.02.7 gaskets

2.02.7.1 material

V Switchgear Data Sheet

_____________________________________________________________________________________________________________

Page 1 of 12

TENDERER'S STAMP SIGNATURE

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SECTION 16363



2.03 Control and protection compartment

2.03.1 degree of protection IP 4X

2.04 Busbars

2.04.1 insulation medium SF6

2.04.2 material copper

2.04.3 single busbars yes

2.04.3.1 location upper part

2.04.3.2 sections No.

2.04.3.3 number of runs No.

2.04.3.4 dimensions

2 04 3 4 1 mm. . . .

2.04.3.4.2 width mm

2.04.3.5 elevated busduct yes/no

2.04.3.5.1 number of runs

2.04.3.5.2 dimensions2.04.3.5.2.1 height

2.04.3.5.2.2 width

2.04.4 double busbars no

2.04.4.1 location upper part

2.04.4.2 number of double busbar sections No.


2.04.4.4 dimensions

2.04.4.4.1 height mm

2.04.4.4.2 width mm


_____________________________________________________________________________________________________________

Page 2 of 12


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SECTION 16363



2.04.5 transfer busbar yes/no

2.04.5.1 location


2.04.5.3 dimensions

2.04.5.3.1 height mm

2.04.5.3.2 width mm

2.04.6 minimum clearances

2.04.6.1 between phases mm

2.04.6.2 phases to earth mm

2.04.7 phase barrier provided yes/no

2 04 8 es/no. .

2.04.8.1 thickness of plating μm

2.05 Busbar support insulators

2.05.1 manufacturer

2.05.1.1 name

2.05.1.2 country of manufacturer

2.05.2 applicable standards IEC

2.06 Earthing busbar

2.06.1 material copper

2.06.2 minimum cross-section mm2 210

2.06.3 dimension

2.06.3.1 height mm

2.06.3.2 width mm

2.06.4 number of runs No.


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2.07 Circuit breaker (vacuum type)

2.07.1 applicable standards IEC 62271-100

2.07.2 class E2, C2

2.07.3 operating facilities

2.07.3.1 hand yes

2.07.3.2 motor yes

2.07.3.3 counter yes

2.07.3.4 tripping coils, including trip cct. supervision No. 2

2.07.4 operation mechanism

2.07.4.1 opening spring

2 07 4 2 s rin. . .

2.07.5 mechanical position indicator of main contact yes

2.07.6 mechanical trip free operation mechanism in yes

transformer feeder

2.07.7 facility for measuring degree of vacuum yes

2.07.8 cable testing facility without disconnecting the cable yes

2.08 Earthing

2.08.1 each busbar section isolator cum earthing switch

2.08.2 feeder isolator cum earthing switch

2.09 Isolator cum earthing switch


2.09.2 operating facilities

2.09.2.1 hand yes

2.09.2.2 motor yes

2.09.2.3 mechanical position Indicator yes


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2.10 Surge arresters (if applicable)

2.10.1 manufacturer

2.10.1.1 name

2.10.1.2 country of manufacturing

2.10.2 applicable standards IEC 60099

2.10.3 type MO plug-in type

2.11 SF6 Gas density (pressure) sensors/transmitters

2.11.1 manufacturer

2.11.1.1 name


2 11 2 IEC. .

2.11.3 independent sensor for each chamber

with remote monitoring facility yes

2.12 Space heater

2.12.1 manufacturer

2.12.1.1 name


2.12.2 applicable standards IEC

2.12.3 application

2.12.3.1 LV compartments yes

2.12.3.2 each motor-drive compartment yes

2.12.4 control system

2.12.4.1 humidistat PTC type

2.12.4.2 thermostat PTC type

2.12.5 MCB for each heater provided yes


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2.13 Live indicators

2.13.1 manufacturer

2.13.1.1 name



2.13.3 type plug-in

2.13.4 provided for each phase yes

2.13.5 provided at each feeder yes

2.13.6 provided with optical output yes

2.14 Weights

2 14 1 k. .

B. Wiring

2.15 Material copper

2.16 Cross-sections

2.16.1 power circuits (min) mm2 2.5

2.16.2 control circuits (min) mm2 1.5

2.16.3 CT circuits (min) mm2 4

2.16.4 VT circuits (min) mm2 2.5

2.16.5 telecommunication/control/protection connections

2.16.5.1 pairs are screened (for communication) yes

2.16.5.2 external wiring mm2 1.5

2.16.5.3 other wiring mm2 0.5


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SECTION 16363



3.00 ELECTRICAL DATA

A. General

3.01 Radio Influence Voltage at 1 MHz dB

3.02 Noise level dB(A) 48

3.02.1 applicable standards IEC 60551

3.03 Remote control Interface terminals/cubicle yes

B. Switchgear

3.04 Common

3.04.1 nominal operating voltage kV 11

. . ra e vo age

3.04.3 frequency Hz 50

3.04.4 rated short-time withstand current, 1s kA 25

3.04.5 rated peak withstand current kA 80

3.04.6 insulation level

3.04.6.1 power frequency withstand voltage, 1 min.

3.04.6.1.1 phase to phase and phase to earth kV 28

3.04.6.1.2 across isolating distance kV 32

3.04.6.2 lightning impulse withstand voltage

3.04.6.2.1 phase to phase and phase to earth kV 75

3.04.6.2.2 across isolating distance kV 81

3.05 Busbars

3.05.1 rated current A 1250

3.05.2 current carrying capacity at 50°C A


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SECTION 16363



3.06 Circuit Breakers

3.06.1 rated currents

3.06.1.1 transformer incomer A 1250

3.06.1.2 outgoing feeder A 630

3.06.1.3 bus coupler/sectionalizer A 1250

3.06.2 current carrying capacity at 50°C

3.06.2.1 transformer incomer (80 MVA) A

3.06.2.2 outgoing feeder A

3.06.2.3 bus coupler/sectionalizer A

3.06.3 rated breaking current capacity

3 06 3 1. . .

3.06.3.1.1 AC component r.m.s. value kA >25

3.06.3.1.2 DC component %

3.06.3.1.3 asymmetrical including DC component kA

3.06.3.2 line charging breaking current A

3.06.3.3 cable-charging breaking current A

3.06.3.4 back to back capacitor bank breaking current A

3.06.3.5 small inductive breaking current A

3.06.3.6 out of phase breaking current A

3.06.4 rated making current capacity

3.06.4.1 short circuit making current kA

3.06.4.2 capacitor bank in rush making current kA


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SECTION 16363



3.06.5 time ratings

3.06.5.1 opening time at

3.06.5.1.1 10% of rated short-circuit current ms




3.06.5.2 rated operating sequence 0-t-CO-t`-CO

3.06.5.2.1 with t = s 0.3

3.06.5.2.2 with t` = min. 3

3.06.6 first - pole - to clear factor 1.5

3 06 7 s 25. .

3.06.8 interrupter

3.06.8.1 manufacturer

3.06.8.1.1 name

3.06.8.1.2 country of manufacturing

3.06.8.2 arc quenching medium vacuum

3.06.8.3 pressure/vacuum inside the interrupter mmHg

3.06.8.4 contact wear indication provided yes/no

3.06.8.5 facility for checking loss of vacuum provided yes/no

3.06.8.6 vacuum monitoring relay provided yes/no

3.06.8.7 shielding against X-Ray radiations provided yes/no

3.06.8.8 length of interruption mm

3.06.8.9 type of contact material

3.06.8.9.1 contacts silver plated yes

3.06.8.9.1.1 thickness of plating µm

3.06.8.9.2 contact pressure on contacts kg/m2


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3.06.8.10 maximum temperature rise over the specified °C

3.06.8.11 ambient temperature

3.06.8.12 heat dissipation at normal current kW

3.06.8.13 number of switchings

3.06.8.13.1 with rated current No. 20,000

3.06.8.13.2 with rated short circuit breaking current No. 100

3.06.8.14 number of operations

before first inspection and maintenance

3.06.8.14.1 switching at rated load No.

3.06.8.14.2 switching at 100% fault capacity No.

3.06.8.14.3 switching at 50% fault capacity No.

3.06.8.14.4 making under fault conditions No.

3.06.9 whether the circuit breaker is suitable for yes/no

trip-free or fixed trip operation (mechanically)

and (electrically)

3.06.10 whether the circuit breaker designed to close yes/noand latch on making or fitted with current

release

3.06.11 whether any anti-pumping device provided yes/no

rated supply voltage of operating mechanism

3.06.11.1 closing coil Vdc 110

3.06.11.1.1 allowable variation of voltage ±% +10% -20%

3.06.11.1.2 power required at normal voltage kW

3.06.11.2 tripping coil Vdc 110




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3.06.11.3 spring charging motor Vdc 110



3.06.11.3.3 motor rated current A

3.06.11.3.4 motor starting current A

3.06.12 rated voltage of shunt opening release V

3.06.12.1 normal current at rated voltage A

3.06.12.2 power W

3.06.12.3 duration ms

3.06.13 whether control circuitry is suitable for yes/no

monitoring of closing and tripping circuits

3.06.14 auxiliary switches (directly driven)

3.06.14.1 normally open (NO) when breaker is closed No. 8

3.06.14.2 normally close (NC) when breaker is closed No. 8

3.06.14.3 adjustable w.r.t the position of main contacts No.

3.06.14.4 rated voltage Vdc 110

3.06.14.5 normal current at rated voltage A 2

3.06.14.6 breaking current A 2

3.06.15 current required at rated voltage by other A

auxiliaries

3.06.16 wiping contacts

3.06.16.1 number No. 2

3.06.16.2 rated voltage Vdc 110

3.06.16.3 current carrying capacity A

3.06.16.4 breaking capacity A


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3.07 Isolator cum earthing switch

3.07.1 rated currents

3.07.1.1 transformer incomer A 1250

3.07.1.2 outgoing feeder A 630

3.07.1.3 bus coupler/sectionalizer A 1250

3.07.2 current carrying capacity at 50°C

3.07.2.1 transformer incomer A

3.07.2.2 outgoing feeder A

3.07.2.3 bus coupler/sectionalizer A

3.07.3 auxiliary contacts (directly driven)

3 07 3 1 No 6/6. . . .

3.07.3.2 voltage Vdc 110

3.07.3.3 motor

3.07.3.3.1 voltage Vdc 110

3.07.3.3.2 power

3.08 Space heater

3.08.1 power W

3.08.2 rated voltage Vac 230

3.08.3 rated current A

C. Wiring

3.09 Power frequency withstand voltage kV ac1min 2


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MDBs, SMDBs and Distribution Boards

16442 - MDBs, SMDBs & DBs Page 1 of 27 Date: 09/08/2014

SECTION 16442

MDBs, SMDBs AND DISTRIBUTION BOARDS

PART 1 GENERAL




1.2 SCOPE

A. Conform to General Requirements for Electrical Services of Division 16.

1.3 DESCRIPTION OF WORK

A. Supply and installation of main low voltage switch boards (MDB), sub main

distribution boards (SMDB), final distribution boards (DB), motor starters and motor

control center (MCC) and related accessories.

B. This specification section covers the design and fabrication of low voltage switchgear

including all items of equipment and materials necessary to complete the assembly

and the information, documents and data required to be supplied by the supplier.

C. Any separate panels shall be as detailed hereafter. Separate panels shall comply withthe requirements of this specification section.

1.4 CODES AND STANDARDS

A. The assemblies and the associated equipment shall conform to the requirements of the

latest edition of the following standards and codes where applicable:

1. Low voltage switchgear and

control gear assemblies

IEC 60439-1, IEC 60529, BSEN60439.

2. Circuit breakers IEC 947-1, BS EN 60947-2, BS EN 60898.

3. Isolators/switch disconnectors IEC 60947-1, IEC 60947-3

4. Current transformers IEC 60185

5. Voltage transformers IEC 60186

6. Measuring instruments IEC 51, IEC 414

7. Contactors IEC 60947-1, IEC 60947-4

8. Overload relays IEC 60947-1, IEC 60947-4

9. Control relays IEC 337-1, IEC 60947-1, IEC 60947-5

10. Indication lamps, push

buttons, switches

IEC 60947-5-1, IEC 337-1, IEC-60536

11. Tropicalisation IEC 68-2-30, IEC 68-2-1 & 2, IEC 68-2-11

12. Automatic transfer switching IEC 947-6-1

13. Direct acting indicating

analogue electrical-measuring

instruments and theiraccessories.

BS EN 60051 / IEC 51







14. Electrical apparatus for

explosive gas atmospheres.

BS EN 60079 / IEC 79

15. Method for determining thecomparative and the proof

tracking indices of solid

insulating materials under

moist conditions.

IEC 112

16. Electrical relays. BS 5992 / IEC 255

17. Low voltage fuses. BS 88 / IEC 269

18. Class 0.5,1 and 2 alternating

current watt-hour meters.

BS 5685 / IEC 521

19. Insulation coordination for

equipment within low-voltage

systems, including clearancesand creepage distances for

equipment.

IEC 664

20. Electrical measuring

transducers for converting

AC electrical quantities to

analogue or digital signals.

IEC 688

21. Low-voltage switchgear and

control gear. Part 3: Switches,

Disconnectors, Switch-

Disconnectors and Fuse-

Combination units.

BS EN 60947 / IEC 947-3

22. Low-voltage switchgear andcontrol gear. Part 4:

Contactors and Motor-

Starters.

BS EN 60947 / IEC-947-4

23. PVC Insulated cables for

switchgear and control gear

wiring.

BS 6231 / IEC 502

24. Earth leakage circuit

breakers.

BS EN 61008

25. Earth leakage circuit

breakers.

BS EN 61009

B. Applicable local laws and regulations.

C. All panel boards shall be manufactured only by manufacturer having BS EN ISO 9001

Certificates. The Contractor shall also submit test certificates such as ASTA or as

issued by any other independent testing authority confirming the declared short circuit

ratings of Switch Boards and circuit breakers.

D. All mains and sub-main panel boards shall undergo the following test before

dispatching and a test certificate shall be forwarded for the same.

1. Primary injection test for all circuit breakers and meters.

2. Secondary test for all protective relays.

3. Milli-Volt droptest.

4. Insulation test.

5. Function test.







E. All such tests shall be witnessed by the Engineer or it shall be carried out by an

independent testing authorities.

F. The Contractor is responsible for complying with all codes, which apply to

equipment. Any special certification requirements or inspection by other authorities

arising from the above shall be arranged by the Contractor and the costs for the same

included in this quotation.

G. The equipment to be provided by vendor must be in complete compliance with this

specification and reference codes. Exceptions or deviations if any, shall be listed

separately, with the quotation for the Engineer’s approval. Any exception, which is

not listed, shall not be considered.

H. Project Conditions:

1. Verify dimensions by field measurements.2. Determine suitable path for moving switchgear into place considering project

conditions.

3. Verify clearance requirements. Locate switchgear to meet installation

tolerances.

4. Revise locations and elevations from those indicated as required to suit

project conditions.

1.5 SUBMITTALS

A. Manufacturers Technical Data: During the time of the Contract and before

substantial completion of the electrical installation, submit to Engineer three(3)

copies of descriptive literature, technical data, maintenance recommendations(from

the equipment manufacturer), catalogues etc

B. Test Reports: Provide test reports. Provide other tests reports necessary to establish

the adequacy, quality, safety, completed status, and suitable operation of each system.

C. Installation Instructions: Submit the complete manufacturers installation instructions

of all the products used.

D. Calculations: Forward the following calculations and data:

1. Calculations and charts proving that discrimination in the breaker

characteristics is achieved. Detailed short circuit level calculation to select

the short circuit rating of the various switchboards. Bus bar sizing calculation

for each switchboard. Calculation for Temperature rise inside switchboards

E. Shop Drawings: The Contractor shall furnish the following drawings and documents

along this submittal for approval:

1. Dimensioned drawing showing outline of the switch boards arrangement and

position of important external features. These drawings shall show masses,

crane lift necessary for untanking and size of lifting lugs or eyes.

2. Single line diagram showing all auxiliary devices.

3. Original catalogues for various proposed components.

4. Drawings of nameplate and all termination arrangements.

5. Drawing giving typical mechanical and electrical details of the voltagecontrol apparatus.







6. Details of cable terminations and fittings.

7. Foundation plan, including foundation loading.

8. Schematic and connection diagrams covering all equipment pertaining to theswitch board.

9. Type and special test certificates as applicable.

10. Approved test certificate / test report.

11. Schedule of Accessories and Fittings.

12. Technical Manual giving installation, operation and maintenance instructions.

13. Schedule of recommended spare parts.

1.6 QUALITY ASSURANCE

A. Design, manufacture, testing and method of installation of all apparatus and materials

furnished under requirement of these specification shall conform to latest publications

or standard rules of the following:1. ADWEA regulations for electrical installation works.

2. Department of Civil Defense requirements.

3. ETISALAT standards and requirements.

B. Product selection for restricted space: Drawings indicate maximum dimensions for

the equipment, including clearance between the equipment and adjacent surfaces and

items. Switchgears having equal performance characteristics and complying with

indicated maximum dimensions may be considered.

PART 2 PRODUCTS

2.1 APPROVED MANUFACTURER

A. Only approved manufacturer as per latest ADDC vendor list.

2.2 GENERAL

A. The specification hereunder shall be applied to all panel boards referred on the

drawings (power layout, single line diagrams as MDB.

2.3 MAIN LOW VOLTAGE SWITCH BOARD (MDB)

A. The switchboards shall comply with BS EN 60439 Part 1, Multi-cubicle type FBA,

Form 4, Type 6, Construction.

B. The switchboards shall be rated 400V three phase and neutral 4 wire 50HZ with

neutral solidly grounded. The equipment shall be suitable for operating on a system

having a fault level of 50 kA rms symmetrical. The switchboard shall be tested for

internal arc withstand as per AS 3439/1.

1. The minimum short circuit rating of MDBs shall be 50 kA for 3 seconds.

C. The switchboard shall confirm to fully type tested (TTA) design having passed all 7

tests complying to the latest editions of BSEN 60439-1. The Contractor shall submit

valid test certificates such as ASTA or as issued by any other independent testing

Authority to the Engineer for approval.







D. Refer to the single line diagram for rating and type of feeder required.

E. Provide meters and CTs as shown in the single line diagram. Meters shall be mountedin separate compartment in each section. Provide permanent lifting means on top of

shipping sections.

F. Provide permanent lifting means on top of shipping sections.

G. Include an integral roll-along lifting device for any switchgear equipped with draw

out devices. Mount lifting device on top of switchgear.

H. Electrical Characteristics:

1. Rated Operating Voltage: 690 V.

2. Rated Insulation Voltage: 1000 V.

3. Rated Current: 3200 A.4. Rated Short Circuit Withstand Current:50 kA, 1 sec.

I. Special Tools:

1. The Contractor shall provide a complete set of all special tools and devices

necessary for the operation and maintenance of the complete assembly.

2. The Contractor shall provide a wall mounted panel to accommodate these

tools and devices.

J. The switchgear assembler should have a valid ISO 9001 certification.

K. The switchgear system and devices shall originate from single reputed manufacturer.

L. In case of local assembly the authorized / approved assembler shall strictly follow the

guidelines and standards laid down by the manufacturer.

M. The Contractor shall provide fault level calculations to substantiate proper selection

of all devices.

N. The Contractor shall carry out routine tests at their works with the valid testing

equipment calibrated by reputed laboratory.

O. The assemblies shall be of the dead-front, multi-cubicle type forming an enclosed

FBA with air insulated switching devices. Each incoming or outgoing circuit-

switching device shall be housed in its own enclosure. The switchgear shall be

completely compartmentalized and metal enclosed in accordance with Form 4 Type 6

separation described in IEC 439. Assemblies shall be freestanding. All switchboards

and MCC shall be single fronted and not double-front.

P. All air circuit breakers shall be withdrawable type. The incoming air circuit breakers

shall have manually and electrically operated spring charge mechanism while the

outgoing air circuit breakers shall be manually operated.

Q. All equipment and materials shall be new.

R. The assembly, including the framework, wiring, earth bar, etc., shall be suitable in all

respects for extension at both ends such that only the minimum of work will be

required to make such extensions.







S. The switchgear shall be painted inside and out. Unpainted galvanized coating of

internal metal work will not be acceptable.

T. A space of 100mm shall be provided at the bottom of each panel.

U. A vertical cable alley covering the entire height shall be provided. The cable alley

shall be minimum 250mm wide.

V. The panel shall be of uniform height of not more than 2450 mm.

2.4 SWITCHBOARD CONSTRUCTION

A. The degree of protection, according to IEC 529, shall be IP 44 with fixed front frame

plus overall plain door and gasket.

B. The switchboard shall be built-up of individual freestanding cubicles to allow easy

installation on site. The cubicles shall be made of electro-zinc coated sheet metal of

2mm thickness. The sheet metal shall be coated with a thermosetting powder of any

epoxy resin base modified by polyester resin, which provide perfect finish and

excellent protection against corrosion (standard "all climate" protection). The color

shall be to RAL 7032 /9002 and to the Engineer’s approval.

C. The switchboard shall be:

1. Provided with a metal sill frame made of structural steel channels section

properly drilled for mounting the switchgear along with necessary mounting

hardware. Hardware shall be zinc plated and passivated.

2. Provided with labels on the front and rear indicating the switchgeardesignation.

3. Provided with cable entry facilities at bottom with 3mm thick removable

gland plates and necessary cable glands. For 1 core cable these plates shall be

nonmagnetic.

4. Provided with gaskets all round the perimeter of adjacent panels, panel and

base frame, removable covers art doors.

5. Provided with bus-bar running at the top all along the Switchgear in a

separate sheet steel enclosure.

D. Operating devices shall be incorporated only in the front of the switchgear with a

hinged door.

1. Only the handles of control and selector switches, push buttons, knobs and

cutouts for lamps and meters shall be arranged on the front doors of the

respective compartments to permit operation without opening the door.

Protective relays shall be mounted on the front door of the compartment. All

other equipment pertaining to a circuit shall be mounted on the withdrawable

chassis. All cutouts shall be provided with gaskets for the purpose of dust

proofing.

E. Current transformers shall not be directly mounted on the buses. Current transformers

shall be mounted on the fixed portion of the compartment.

F. Suitable barriers shall be placed between circuit breakers and all control, protectiveand indication circuit equipment including instrument transformers. External cable







connections shall be carried in separate cable compartments for power and control

cables.

G. After isolation of the power and control connections of a circuit, it shall be possible to

safely carry out maintenance in a compartment with the bus bars and adjacent circuits

live.

H. The withdrawable chassis shall move on suitable guides and on stainless steel rollers

or balls to facilitate easy withdrawal.

I. Cable entry shall be from front from a separate cable alley provided adjacent to each

vertical section. Cable shall enter each module from the sides.

J. Cable alleys shall be provided with suitable hinged doors. The cable termination shall

be completely shrouded. It shall be possible to safely carry out maintenance work oncable connections to any one circuit with the bus bars and adjacent circuits live.

Adequate number of slotted cable support arms shall be provided for cleating the

cables.

K. The switchgear shall be divided into distinct vertical sections each comprising:

1. A completely metal enclosed bus bar compartment running horizontally.

2. Individual feeder modules arranged in multi-tier formation. It is essential that

the modules are integral multiples of the basic unit size to provide for

flexibility in changes, if any, at site.

3. Enclosed vertical bus-bars serving all modules in the vertical section for

safety isolation of the vertical bus-bars, insulating barrier with cut outs shall

be provided to allow the power stab contacts to engage with vertical bus-bars.

4. A horizontal separate enclosure for all auxiliary power and control buses, as

required, shall be located so as to enable easy identification, maintenance and

segregation from the main power buses. Tap off connections from these buses

shall be arranged separately for each vertical section.

L. Each vertical section shall be equipped with thermostatically controlled space heaters,

which may be located in the cable alley and with internal light.

M. Open metal sheet shall be provided between two adjacent vertical sections running to

the full height of the switchgear except for the horizontal bus-bar compartment.

However, each shipping section shall have metal sheets at both ends.

N. All equipment associated with a single circuit shall be housed in a separate module

compartment of the vertical section. The compartment shall be sheet steel enclosed at

the sides and the rear with the withdrawable units in the position or removed.

However, for front cable entry type switchboards, a plate cover with a slot to permit

wiring connections shall be provided on the side corresponding to the cable alley

O. All doors shall be provided with concealed type hinges and captive screws.

P. All withdrawable chassis housing circuit breakers shall be of the fully draw out type.

Q. It shall be possible to draw out the withdrawable chassis without having to unscrew orunbolt any connections to the equipment mounted on the withdrawable chassis. The

power and control draw out type connections shall be of the slab-in or sliding type.







All draw out contacts including for auxiliary and control wiring shall be of self-

aligning type.

R. All identical equipment and corresponding parts including chassis of draw out

modules of the same size shall be fully interchangeable, without having to carry out

modifications. For trouble free interchangeability, the draw out arrangement shall be

designed such that normal dimensional variations are taken care of by self-aligning

feature of the modules.

S. All out-going breakers shall be fitted on prefabricated appropriate mounting plates

and access to their operating toggles shall be provided through an appropriate front

cover, fixed to the front frame.

T. The cable connection shall be made in a separate compartment. The access shall be

possible through hinged covers.

U. The cubicle shall be divided into modules with a minimum of 15% of empty modules

for extension.

V. All incoming cable entries shall be from bottom. Outgoing cable entries shall be from

bottom or top as per the requirement.

W. Compartments for future breakers shall be complete with bus connections, plug-in

base and mounting plates, ready for the insertion of a breaker.

X. ACBs shall be draw-out with ratings, breaking capacity etc. as mentioned elsewhere

in this specification and Contract drawings.

Y. Out-going MCCBs shall be draw out type, operated by door interlocked rotary

handles with ratings breaking capacity etc. as given elsewhere in this specification.

Z. The draw out contact shall be only between copper/copper alloy faces, which are

silver-plated.

AA. All live parts shall be provided with suitable automatic shutter to cover all live parts

when the section is in withdrawn position.

BB. No cast iron or cast aluminum shall be used in any part of the assembly which is

subjected to mechanical stress.

CC. All incoming and outgoing switching devices shall have provision for locking in the

‘off position’.

DD. Where the FBA is required to bridge one or more civil work expansion joints in the

substation construction, this requirement shall be detailed on the civil drawings.

EE. Degree of Protection:

1. The degree of protection shall be a minimum of IP 44. IP 20 minimum shall

apply within an isolated compartment or cubicle while the remainder of the

assembly is live. Metallic barriers shall provide this protection. Unless

otherwise approved this requirement shall apply to bus-bar shutters and to







devices energized from external supplies, such as motor heater auxiliary

switches.

FF. Incoming and Sectionalizing Units:

1. Incoming and sectionalizing units shall be air circuit breakers and shall be

mounted in separate panels.

2. Air circuit breakers shall be four-pole or three-pole type as indicated in the

single line diagram for three phase and neutral systems. They shall be

provided with “In Service/Out of Service/Test Point” positions and suitable

locking devices shall be provided for the “Out of Service” and “Test Point”

positions.

3. A dedicated compartment shall be included for metering on the incomers.

4. Supplier shall supply details for incoming units and bus-bar standard earthing

arrangements.

GG. Outgoers:

1. They shall be ACB or MCCB with type and ratings as indicated in the

Contract drawings and as specified in the relevant section of this

specification.

2. Suppliers shall provide a minimum 160mm space between the base of the

switchgear and the underside of the lowest outgoers.

3. All incoming and out going circuit breakers shall be provided with a release

to trip the breaker, instantaneously if closed onto a fault.

4. All compartments shall occupy the full cubicle width; a semi module

compartment or vertical division between compartments is not acceptable.

5. Supplier shall ensure that the number of outgoing feeders in any verticalsection of switchboard shall be such that there is adequate space in the cable

alley for all power, and all control cables entering the panel. The number of

feeders shall not exceed 8 numbers for each vertical panel.

HH. Cable and Wire Terminations and Terminals:

1. All internal control and auxiliary wiring shall terminate in suitable spring

loaded, clamp type terminals and shall be provided with a permanent, easily

read numbering system at both ends in accordance with the wiring diagram.

Wires shall be identified by means of numbered and or lettered sleeves.

2. Formal blocks shall be arranged and positioned to afford easy access for

carrying out external cabling, testing, inspection and maintenance.

3. Cable Glands shall be of the double sealed compression type with positionarmor bond suitable for XLPE and PVC insulated cables.

II. Mechanical Indications: All main circuit devices other than contactors shall be

provided with mechanically operated “on” and “off” indicators which shall be

positively driven in both directions and shall be visible from the front of the

assembly.

JJ. Safety Shutters:

1. Where shutters are provided to maintain IP 20(minimum), they shall

automatically cover all bus bar and cable spouts or isolating contacts

whenever removable or withdrawable units are removed.







2. The safety shutters shall be automatically opened and closed by action of the

removable or withdrawable unit movement. A positive drive to the shutters

shall be provided in both directions.3. They shall be capable of being padlocked in the closed position.

KK. Interlocks:

1. All units shall be provided with a complete set of electrical and mechanical

interlocks to prevent incorrect operation and to provide safety for personnel

in addition to any external interlocks specified for operational reasons.

2. On removal of withdrawable units, mechanical interlocks shall be provided to

prevent the following operations and any other operations which could cause

danger or damage:

a. The unit being closed unless it is correctly located in the service,

isolated or earthed positions or unless it is removed from the fixed

part of the assembly.

b. The unit being withdrawn from or inserted into the feeder spouts or

isolating device when it is in the closed position.

c. The unit being moved to any position other than that selected by

means of the mechanical selector.

d. The unit being withdrawn or inserted into the fixed part unless it is in

the correct state for withdrawal or insertion.

e. The unit being closed in the service position unless all auxiliary

circuits between fixed and removable parts have been completed.

f. Means shall be provided to prevent opening of cubicle doors or

covers before disconnection of supply to exposed live parts within.

LL. Interlocks and Transfer Functions:

1. The general philosophy of the required inter-trips and interlocks shall

generally be as indicated hereunder. The vendor shall submit all logic

diagram and interlocking line diagram to the Engineer for approval.

2. The main switch board incoming transformer feeders and the bus section

circuit breaker shall be provided with the required electromechanical

interlock for auto transfer incase of failure of an incoming supply facilities

shall be provided for manual transfer.

3. The various interlocking schemes shall generally as indicated on the drawings

and to the Engineer’s approval.

MM. Nameplates shall be engraved on traffolite sheet, with white letters on black background. Nameplates for main breaker, tie breaker, section and outgoers modules

identification and for the entire switchboard shall have letters not smaller than 13 mm

high. Nameplates for branch breakers, switches, push buttons, control devices, pilot

lights and metering shall have letters not less than 3 mm high. All nameplates shall be

mechanically fixed with non-ferrous metal screws.

NN. Warning signs on doors and access panels shall be engraved traffolite with white

letters on red background.

OO. Control contacts, auxiliary contacts, relays and small or light mechanisms shall be

enclosed and protected, and shall be accessible for repair or adjustment.







PP. Engraved trafolite/aluminum mimic of the SLD shall be provided on the front face of

the switchboard. The same shall be mechanically fixed with non-ferrous metal

screws.

QQ. Anti condensation heaters shall be provided within the assembly and shall be

controlled by a panel-mounted hygrostat with a 50% to 100% setting range.

2.5 BUSBARS

A. The bus-bars shall be TPN+E (full neutral and half earth). Earth bar shall run through

the entire length of the switchboard. The metal frames and all components shall be

connected to the earth bar.

B. The bus-bar shall be of uniform cross section throughout the length of the switchgear

and shall be of hard drawn high conductivity tinned copper.

C. Bus-bars shall be provided with at least the minimum clearances in air as per

applicable standards for a 500V, 3 phase system.

D. The complete bus-bar system shall be certified for a fault level as indicated on the

drawings, certificate for a typical bus-bar system assembled by the switchgear

assembler shall be submitted to the Engineer for approval.

E. Bus-bars shall be totally enclosed within sheet steel compartments to provide

optimum safety against accidental contact. The busbar compartments shall be

properly marked with danger signs.

F. Horizontal and predrilled vertical bus-bar, make modification and extension very easy

in addition to the above characteristics.

G. The vertical bus-bars shall be accessible through hinged doors.

H. The bus-bars shall be PVC sleeved with high die electric strength (450 V/mm). The

maximum operating temperature at a design temperature of 55 deg. C shall not

exceed 90 deg. C for normal operating and 200 deg. C for short circuit conditions.

The bus-bar dropper shall be rated at 120 % of the current carried by the busbar with

a minimum of 800 A rating.

2.6 SUB-MAIN DISTRIBUTION BOARD, SMDB-FREE STANDING

A. Description:

1. The distribution panel(s) shall be of the free standing cubicle multitier type

incorporating 3 phase, neutral and earth insulated tinned copper busbars, all

necessary CTs, and the like as required.

2. Each cubicle shall be equipped with thermostatically controlled heaters which

shall be 'on' all the time and ventilation means.

3. Switchboard shall be designed to operate on a 400/230V 3 phase and neutral

50HZ supply and shall have a minimum short circuit rating of 30 kA for one

second, for the MDB's, switchboards shall be constructed in accordance with

BSEN 60439 Part 1 multicubicle type FBA FORM 4b type 6.

4. Main Distribution panel(s) shall be equipped with all necessary circuit breakers

and components with enough spare outgoing for any future use.







B. Busbars:

1. The busbars shall be made of hard drawn high conductivity tinned copper and

rated for continuous operation. The main bus bar rating shall be the samethroughout the entire length of the switchboard and a provision shall be made

in the busbars system to allow for expansion and contraction caused by

temperature variation.

2. The busbar shall be sized taking into consideration the ambient temperature

and the specified temperature rise.

3. The neutral busbar shall have the same size as the phase busbars while the earth

bar shall have a minimum size of half the phase busbar.

C. Breakers:

1. All breakers shall be fixed type and all circuit breakers of the same type and

rating shall be entirely interchangeable.

2. The cubicle shall be front operated with a mechanical ON/OFF position

indicator and shall be designed and tested in accordance with relevant

standards.

3. The main incoming supply shall be complete with a flush mounted ammeter for

each phase, CTs, phase to phase voltmeter. Each meter shall have a phase

selector switch and indication lamps.

D. Enclosure:

1. The switchboard shall be constructed of a minimum 2mm thick electro-

galvanized steel coated with high solid enamel polyester electrostatic spray and

oven baked. There shall be adequate channel frames, drilled or slotted for ease

of assembly, to support cable tails, clamps and terminations within the cubicles.2. The busbars shall run in a separate compartment with the partition shall be

made of Alu-zinc or of similar material as the enclosure of at least 1mm

thickness. All entries and openings shall be vermin-proof. All live conductive

parts either on the incoming or outgoing side shall be shielded in such a manner

that they cannot be accidentally touched when the doors are open.

3. The degree of protection of the Switch Board enclosure should be IP 44.

4. The Contractor shall provide all necessary means of ventilation and forward the

necessary calculation in order to ensure that maximum temperature rise within

the panel will not exceed 35 deg at the operating ambient temperature of 55ºC.

2.7 SUB-MAIN DISTRIBUTION BOARD, SMDB-WALL MOUNTED

A. General: MCCB distribution boards shall comply with IEC 60439-1 Form 2b type 2

B. Enclosures:

1. MCCB distribution boards must be totally enclosed.

2. The degree of protection according to IEC 439.1 shall be IP 41 minimum for

indoor installation and IP 55 for outdoor installation.

3. The enclosure shall be manufactured from minimum 1.5 mm thick electro-

zinc coated sheet steel with Epoxy polyester powder finish and color to the

Engineer’s approval.

4. A hinged door fitted with lock and key has to be opened for operating the

switchgear. Access to the cabling space and to the switchgear shall be

obtained by removing a front cover bolted fastener.







5. Ample-wiring space shall be provided. Detachable blank gland plates shall be

provided at the top and bottom.

6. Anti condensation heater shall be provided.

C. Pan Assembly:

1. The pan assembly shall be completely independent unit that can be taken out

of the enclosure for maintenance purpose.

2. All components are mounted on a strong chassis consisting of 2mm thick

electro-zinc coated folded sheet steel.

3. Bus-bars shall run in separate compartment with metallic partition and shall

be made of hard drawn high conductivity tinned copper, air insulated and full

neutral and earth bar included.

D. Breakers:

1. Incoming and out-going breakers shall be MCCBs of fixed type. Breakingcapacity of the MCCBs shall be in line with the prospective fault level of the

installation but shall not be less than fault level calculation. Ratings and

capacity shall be as given elsewhere in this specification.

2. Short circuit calculations shall be submitted to the Engineer for approval.

3. Breaker selection shall be made to achieve maximum discrimination between

the upstream and downstream breakers.

E. Electrical Characteristics:

1. Rated Insulation Voltage: 600 V (AC).

2. Maximum Rated Current of Busbars: Up to 630 A.

3. Rated short time withstand current of bus-bars shall be as shown on the single

line diagram.

4. The short circuit capacity of the distribution boards shall be 30 kA minimum

and shall be rated to withstand the short-circuit level of the position it is

installed. A short circuit level calculation shall be submitted and the short

circuit level of the distribution board shall be upgraded accordingly.

F. Auxiliaries and Accessories:

1. All MCCB’s shall be provided with 2 number spare NC and NO contact.

2. In addition the incomer shall be provided with ammeter and voltmeter and

selector switches.

2.8 DISTRIBUTION BOARDS

A. Description:

1. The specification hereunder shall be applied to al panel boards referenced on

the drawings/load schedules as DBs. The distribution board shall be flush /

surface mounted split busbar type and shall be provided with standard

extension box to allow cable glanding if required. The distribution board shall

be surface mounted when installed within the electrical room/service rooms.

2. Distribution boards shall be provided with an isolator incomer with common

ELCBs for group of lighting and A/C circuits and common ELCBs for group

of power circuits for each section of MCBs or RCBOs for each power circuit

as shown on schedules.

3. As a standard item, all MCB boards shall be provided with permanent circuitidentification charts to the approval of the Engineer.







4. MCBs shall comply with IEC – 898 and RCBOs shall comply with BS EN

61009. ELCBs shall comply with BS EN 61008.

5. DBs inside electrical rooms shall be surface mounted type fixed onto a Uchannel support.

B. Enclosures:

1. MCB distribution boards to be surface / flush mounted type. Enclosures within

electrical rooms must be surface mounting type; powder coated rustproof sheet

steel units, complete with circuit breakers providing thermal overload and

magnetic short-circuit and earth fault protection as per drawings. The enclosure

protection to be IP 31, while the complete assembly shall comply to IEC439-1.

2. Surface wall mounted DBs shall be fixed on U channel support and not direct

to the wall. Enclosure shall be from GMC, Rittal, Himal, Electra or ETA.

C. Busbar:1. The MCBs shall be mounted on either 3 phase or single phase or split busbars

as appropriate. All spaces which are not provided with breakers shall be

covered with blank plates.

2. A final sub-circuit neutral assembly and an earthing bar assembly shall be

available to facilitate the connection of neutral conductors and protective

conductors respectively.

D. Breakers:

1. Miniature circuit breakers, RCBOs and earth leakage circuit breaker and shall

be provided as indicated on the load schedules.

2. The short circuit rating for the MCBs and RCBOs shall be 25KA for DB’s.

3. All circuit breakers shall be factory calibrated to ambient temperature of 50ºC.

2.9 DISCONNECT SWITCH

A. Disconnect switches (isolators) shall be manufactured to IEC and British standards.

B. Disconnect switches shall be heavy duty (AC23) with operating handle interlocked

with the switch cover, in general purpose rust proof aluminum enclosure and to IP44

finished in gray stove finish.

C. Switches shall be quick make, quick break action. Provision shall be made for

padlocking in either the “On” or “Off” position.

D. Switch blades shall be fully visible when in the “Off” position.

E. Operating handles shall be interlocked to prevent doors from being opened when

switch is closed. Provision shall be made to defeat this interlock with a screwdriver.

F. Fuse clips shall be designed for HRC BS 88/IEC 269 fuses without adapters and shall

reject standard code fuses.

G. Switches mounted outside, in damp or dusty locations and unconditioned areas shall

be supplied in weather resistant enclosures IP 65 made of aluminum with double wall

construction.







H. Sample and catalogues with installation details shall be submitted for approval by the

Engineer prior to ordering.

I. Provide a disconnect switch ahead of all motors, starters and electrical equipment

where shown on the drawings and where required to meet Code regulations and

jurisdictional authorities, whether the equipment is supplied or installed under the

Electrical Division or any other division.

J. All disconnect switches shall be provided with tag to the Engineer’s approval to

indicate equipment connected to the switch. The feeding circuit reference and the

related distribution board number.

2.10 MOTOR STARTERS

A. Description:1. Starters shall be manufactured and type tested in accordance with IEC 947-4

and IEC 947-4-1

2. All motors shall be provided with heavy duty contactor type motor fuseless

starters selected for coordination type 2 in accordance with IEC 947-4

generally complying with the following and protected through circuit breaker.

a. 3 kW direct on line starting

b. 3 kW to 25 kW Star Delta starting

c. 25 kW and above reduced voltage electronic soft starters.

3. Each starter panel shall be provided with a main incoming MCCB capable of

carrying the full load current.

4. Each starter shall comprise as a minimum:

a. On load triple pole MCCB with two normally open and one normally

closed auxiliary switches. The MCCB to be mechanically interlocked

with the starter component door and capable of breaking the motor

starting current and of making onto a fault at the motor terminals.

Provision to be made for padlocking the MCCB in the 'OFF' position.

b. Three pole contactors to be fitted with three normally open and three

normally closed auxiliary contacts. All the auxiliary contacts to be

wired down to the starter terminal block.

c. One triple pole thermal over current relay incorporating over current,

phase sequence and single phase protection with adjustable trip

settings. External mechanical hand reset to be provided.

d. One control circuit MCB or fuse and one copper link.e. Each starter shall be fitted with one set of local start/stop push buttons

and a local/remote/auto selector switch or hand/off/auto switch as

required. Each starter control wiring terminal block shall include

control terminals for connection of remote push buttons, auto circuits

and local and remote emergency stop push buttons.

f. Where more than one motor with a duty/standby or duty/backup

functions used, the starter control wiring shall be arranged to

automatically change duty upon the fault tripping of the selected

motor. A duty/standby or sequence selector switch shall be provided.

g. Each starter shall be fitted with twin led indication lamps indicating:

1) Motor running (green)

2) Motor stopped (red)3) Overload tripped (amber)







h. Each starter shall be fitted with an ammeter and selector switch for

motors 3 KW and above.

i. Each starter to be equipped with labels in English and Arabic givingdrive designation, plant number and control operation.

j. Each starter control wiring shall include control terminal and control

relays as necessary to achieve any interlocking specified else where or

to achieve any control or monitoring thru the BMS where specified.

k. Adjustable time delay devices for Star Delta Starters.

l. Starter units for manual operation shall have push buttons for starting

and stopping, together with auxiliary contacts for remote indicator

lights where specified. Starter units arranged for automatic operation

shall have hand/off/auto controls and remote push buttons.

5. All Star Delta starter shall be provided with mechanical and electrical

interlocks for star delta contactor assembled to prevent short circuiting.

B. Enclosure:

1. Panels shall be constructed of a minimum 1.6mm thick electro galvanized steel

coated with high solid enamel polyester electrostatic spray and oven baked and

protected to IP 54.

2. Front access shall be arranged for all panels with hinged lift off doors. Dust and

damp proof gasket around the edge and fitted with lockable cam type

chromium plated handle mechanically interlocked with the starting MCCB.

3. The enclosure for the motor starters are divided into two types as follows:

a. Single starter panel.

b. Motor control centre.

4. Single starter panel:a. This specification shall be applied for starter panels used for starting

a single equipment with a maximum of two motors.

b. All equipment shall be mounted on sheet steel mounting plate with

screws into tapped holes and all live parts shall be shrouded to a

minimum IP54.

c. The minimum short circuit rating for the different components shall

be 25kA. However, the Contractor shall forward a short circuit

calculation and upgrade the same if found necessary.

5. Compensated Equipment:

a. Any motorized valve or damper controlled via a compensated system,

shall be arranged such that a manual selector switch is provided to

override compensated selection and enable manual opening/closing oron/off control, as appropriate. Any compensator unit mounted within

the control cabinet shall remain in the manufacturer's purpose made

enclosure and be installed strictly in accordance with the

manufacturer's recommendations.

b. The panels shall contain devices for automatic restart of units after

power failure where required.

2.11 MOTOR CONTROL CENTERS (MCC)

A. Motor control centers shall be of similar construction to the main low voltage

switchboard in addition shall comply with the following specification:

1. Motor control centers shall be in accordance with IEC 947-4-1 with type 2coordination.







2. All power and control devices shall be mounted in separate compartments.

All power and control wiring shall be segregated. Separate color-coded wires

shall be used for power and control wiring, the same shall be properlyferruled.

3. Control wires shall be of flexible copper not less than 1.5 sq. mm.

4. Chiller sequence controller shall be provided.

5. Automatic controls for pump duty stand/by, duty selection, interlocking with

chillers shall be provided.

6. All motors shall be provided with phase failure, under voltage, phase

sequence over current and earth fault protection.

7. Run/Trip/Off indication shall be provided for all pump with lamp test facility.

8. On/Off switch for chiller’s control panel shall be provided.

9. Hand/Off/Auto selector switch and On/Off push buttons shall be provided for

all motors.

10. The degree of protection of the switchboard enclosure shall be IP 54

(minimum).

B. Outgoers:

1. Motor starters and contactors shall have an utilization category of AC-3

(starting of squirrel-cage motors, switching off motors during running) and

AC-4 for motors with inching or reversing duties.

2. Motor starter components (i.e. breakers, contactors, relays etc.) shall be

selected in accordance with IEC 947 947-4-1 type 2 coordination.

3. Ammeters shall be fitted to all starters for motors greater than 3.0kW. On-off

fault indication of Contractors shall be fitted on the front of the starter

compartment with a red light for “ON”, green light for “OFF” and an amberlight to indicate motor overload or fault conditions.

4. Suppliers shall provide a minimum 160mm space between the base of the

switchgear and the underside of the lowest outgoers.

5. All incoming and out going circuit breakers shall be provided with a release

to trip the breaker, instantaneously if closed onto a fault.

6. All compartments shall occupy the full cubicle width; a semi module

compartment or vertical division between compartments is not acceptable.

7. Supplier shall ensure that the number of outgoing feeders in any vertical

section of switchboard shall be such that there is adequate space in the cable

alley for all power, and all control cables entering the panel. The number of

feeders shall not exceed 8 numbers for each vertical panel.

2.12 AIR CIRCUIT BREAKERS

A. General:

1. The circuit breakers shall comply with IEC947-2, 3pole or 4pole as

mentioned in the single line diagram. However the ATS and bus coupler

ACBs shall be of 4 poles.

2. The breaking capacity performance certificates shall be available for category

B to the above mentioned standards. The test shall be carried out with a

breaking performance during operation (Ics) equal to the ultimate breaking

capacity (Icu).

3. All circuit breakers can be reverse fed without reduction in performance.







4. Breaker shall be equipped with a grounding device to solidly ground the

framework before the main disconnecting contacts are engaged and to

maintain the grounding until after the contacts have separated.5. Breaker trips shall be completely self-powered with no external control

power source required. If external control power is required, 125V D.C.

batteries and charger shall be provided. Batteries to be Ni-cad type.

6. Breakers shall be provided with overload, short circuit and earth fault

protection and have the following functions:

a. Adjustable long time delay trip.

b. Adjustable short time delay trip.

c. Instantaneous trip,

d. Ground fault trip.

7. Breakers shall be suitable for operating at 55ºC ambient temperature and shall

be tropicalised.

B. Construction:

1. The air circuit breaker ratings shall be as shown on the single line diagram.

2. All air circuit breakers main contact shall be encased in a reinforced polyester

casing and offer double insulation from the operators on the breaker front

face. The circuit breaker also shall offer total insulation between the control

part and the power part.

C. Operating Mechanism:

1. The operating mechanism shall be the O-C-O stored energy spring type

motor/manually operated with a closing time of less than or equal 80 ms.

2. Each breaker shall be provided with 3 nos. normally open and 3 nos.normally closed potential free spare auxiliary contacts rated 10A at 240 V ac.

D. Arc Chutes: Arc chutes shall be common on the whole range and removable on site to

allow inspection of arc chutes and main contacts.

E. Electrical Auxiliaries: All electrical auxiliaries including the motor spring charging

mechanism shall be field adaptable without adjustment or the necessity for any tool

(except a screwdriver).

F. Trip Units: The trip units shall be micro-processor based type and use digital

programming technique for highest protection accuracy against overload, short circuit

and earth fault. They shall be integrated as part of the circuit breaker. The trip unitshall have a wide adjustment range to allow flexibility of the setting on site. The trip

unit shall measure the true RMS value of any waveform of current. The trip unit shall

be equipped with a push to reset mechanical indicator, for anti-pumping function.

G. Control Unit:

1. The control unit shall be microprocessor based type and shall make it

possible to display the electrical quantities relevant to the protected line, and

the control of electrical devices through power relays housed in the release

case.

2. The control unit shall also provide the following:

a. Harmonic analysis and total harmonic distortion (THD).

b. Maintenance indications providing the wear and tear of the main power contacts of the breaker etc.







H. Dialogue Unit: The dialogue unit shall be microprocessor based type and shall give

information on electrical quantities, alarms and the circuit breaker condition. Besides

it shall receive the operational commands for the circuit breaker sent by centralizedsystem. The dialogue unit shall be provided with necessary interface for data

transmission and data reception from the BMS system.

I. Auxiliaries and Accessories:

1. 1 ammeter and volt meter with selector switch.

2. Operation counter

3. ON/OFF/Fault/Control Circuit fault indication light with lamp test facilities.

2.13 MOULDED CASE CIRCUIT BREAKERS (MCCB)

A. Moulded case circuit breakers shall conform to the latest editions of BSEN 60947-2.

B. The MCCB's shall have a minimum service short circuit capacity similar to the panel

board where the same is installed.

C. MCCB's shall be of the heavy duty quick make quick break type. Each breaker shall

have adjustable type thermal over current and magnetic release and also an

instantaneous magnetic trip.

D. Three pole breakers shall have a common trip with a single operating handle and

designed so that any overload in one pole automatically causes all poles to open.

Breakers shall be trip free and each shall have a trip indication independent of ON or

OFF positions.

E. The MCCB's at the MDB’s shall be provided with the necessary number of change over

auxiliary switch and with signaling unit which shall be connected to the BMS system in

order to provide information on the breakers conditions and alarms where required.

F. Withdrawable MCCB's shall be provided with safety shutter to cover the live parts

when the breaker is withdrawn.

G. Wherever shown on the drawings, MCCBs shall be provided with earth leakage alarm

relay or earth leakage relay of fixed/adjustable sensitivity.

H. MCCB [from 100 to 630 A]

1. The moulded-case circuit breakers shall comply with IEC 947-1 and 947-2

standards. They shall be of category A with a rated service breaking capacity

(Ics) equal to the ultimate breaking capacity (Icu) - on all the operational

voltage range for the ratings up to 630 A.

2. The moulded-case circuit breakers shall be designed for both vertical and

horizontal mounting, without any adverse effect on electrical performance. It

shall be possible to supply power either from the upstream or downstream

side.

3. The moulded-case circuit breakers shall provide class II insulation (according

to IEC 664 standard) between the front and internal power circuits.







I. Construction:

1. For maximum safety, the power contacts shall be insulated in an enclosure

made of a thermosetting material from other functions such as the operatingmechanism, the case, the trip unit and auxiliaries.

2. The operating mechanism of the moulded-case circuit breakers shall be of the

quick make, quick-break type with fault tripping over ridding manual

operation. All poles shall operate simultaneously for circuit breaker opening,

closing and tripping.

3. The moulded-case circuit breakers shall be front operated by a toggle or

handle that clearly indicates the three positions: ON, OFF and TRIPPED.

4. The moulded-case circuit breakers shall be equipped with a "push to trip"

button in front to test operation and the opening of the poles.

5. Where required, motor operated mechanism, shunt trip, under voltage release,

auxiliary switches up to four change over contacts and a tripped signal

contact shall be provided. Each of these units shall incorporate a pre-wired

terminal strip, which is accessible from the front of the breaker without

removing the cover.

J. Current Limiting:

1. The moulded case circuit breakers shall be capable of greatly limiting

currents. For short circuits, the maximum thermal stress shall be limited to

(A: Amperes and S: Seconds):

a. 106 A² s for ratings up to 250 A.

b. 5 x 106 A² s for ratings between 400 A and 630 A.

2. These characteristics will allow high cascading performance with moulded-

case or miniature circuit-breakers.

K. Auxiliaries and Accessories:

1. The addition of motor mechanism or a rotory handle shall in no way affect

circuit breaker characteristics:

2. Only three stable tripping mechanism positions (ON, OFF and TRIPPED)

shall be possible with the motor mechanism.

3. Suitability for isolation shall be provided by positive contact indication (ON

and OFF) in front of the motor mechanism module.

4. The moulded case circuit breakers shall be designed to enable safe on-site

installation of auxiliaries such as voltage releases (shunt and under voltage

releases) and indication switches.

5. The addition of a motor mechanism, module or a rotory handle, etc., shall notmask or block devise setting.

6. It shall be possible to equip the moulded case circuit breakers with devices

indicating faults without tripping the circuit breaker.

7. 2 NO and 2 NC spare contacts.

L. Protection Function General Recommendations:

1. Moulded case circuit breakers with ratings up to 250A shall be equipped with

inter changeable Thermal-magnetic trip units.

2. Moulded case circuit breakers with ratings over 250A shall be equipped with

electronic trip units. The trip units shall not augment overall circuit breaker

volume.

3. Electronic trip units shall comply with appendix F of IEC 947-2 standard(measurement of RMS current values, electromagnetic compatibility, etc.,)







4. Electronic and thermal-magnetic trip units shall be adjustable and it shall be

possible to fit lead seals to prevent unauthorized access to the settings.

5. Protection settings shall apply to all circuit breaker poles.

2.14 MINIATURE CIRCUIT BREAKERS

A. General:

1. MCBs shall comply with BS EN 60898.

2. MCBs shall be 35mm symmetrical rail mounted type and available in one,

two, three or four poles version.

3. MCBs can be reverse fed without reduction in performance.

B. Construction:

1. The operating mechanism shall be mechanically trip free from the operating

handle so as to prevent the contacts from being held closed against shortcircuit conditions. It shall be of the "automatic resetting type".

2. The individual operating mechanism of each pole of a multi-pole MCB shall

be directly linked within the MCB casing and not by the operating handles.

3. The operating handle shall be of the toggle type.

4. Each pole shall be provided with bi-metallic thermal element for overload

protection and magnetic element for short circuit protection.

5. Terminals shall be of the tunnel type (IP20) in order to minimize the risk of

direct contact.

2.15 METERING

A. Digital Metering Instrument:

1. The metering instrument shall be suitable for measurement, storage and

supervision of electrical quantities. Its dimensions shall not be less than

96x96mm.

2. The metering instrument shall be able to give the minimum following

measurements:

a. Voltage: phase and line.

b. Current.

c. Power: active, reactive and total values.

d. Power factor.

e. Frequency.

f. Energy: active and reactiveg. Harmonics: residual and total harmonic content for each harmonic

order up to the 20th per phase, both for voltage and current values.

3. The multimeter shall be equipped with an LCD display and function keys to

select and check the measured values.

4. The multimeter shall be equipped with a memory of minimum 128K capacity

to store the measured values. It shall be equipped with a communication port

RS485 to allow its connection to the network

5. Necessary software shall be provided for the visualization of online measured

values.

6. The measurement accuracy shall not exceed ± 1%.

7. The display refresh time shall be less than 2s.







2.16 CURRENT TRANSFORMERS

A. Current transformers shall comply with IEC 185.

B. The conditional ratings of current transformers shall correspond with the switchboard

rating and shall be such as to maintain the overall metering accuracy as is necessary

to operate relays within the tolerances specified by the manufacturer.

C. Current transformers secondary ratings shall be:

1. For Protection: 1A.

2. For Metering: 5A.

D. Current transformers shall have the following accuracy as a minimum, for protection

Class 5P (Except for REF Protection which will have PS class CT).

1. For Indication: Class 12. For Metering: Class 1

E. The manufacturer shall ensure that the current transformers are such that the relays

will operate correctly when set at any point within their ranges.

F. Current transformers secondary wiring shall be earthed on one side through a

removable link. Where current transformers are connected in star, the star point shall

be earthed through a removable link.

G. Shorting links shall be provided for each current transformer.

H. Current transformers shall be cast resin insulated.

2.17 VOLTAGE TRANSFORMERS

A. Voltage transformers shall comply with IEC 186.

B. Voltage transformers shall be suitable in rating and accuracy for their functions, loads

and duties. As a minimum they shall have following accuracy,

1. Protection Applications: Class 5P.

2. Indication and Metering Applications: Class 1.

C. The primary and secondary circuits of the voltage transformers shall be protected by

fuses and the secondary winding shall be earthed at one point through a removablelink.

D. Voltage transformers shall be cast resin insulated.

E. The manufacturer shall provide MCBs with auxiliary contacts or alternatively 4-pole

MCBs on the secondary side of the voltage transformers.

2.18 CONTACTORS

A. All contactors shall comply with IEC 947-1, IEC 947-4.

B. Duty category for lighting contactors shall be AC1 and for inductive load shall beAC3.







C. Contactors shall be protected against direct finger contact, mechanical life shall be 15

to 20 million operating cycles. Shall be suitable for 1200 operating cycles per hour.

D. The contactors shall be of 3 pole construction capable of handling high rush currents

and suitable for operating up to 55 deg. C ambient temperature without any derating.

E. Coils shall operate between 85% to 100% of the nominal voltage.

2.19 EARTH LEAKAGE CIRCUIT BREAKERS (ELCBS)

A. Current operated earth leakage circuit breakers shall be in accordance with BSEN

61008 providing the functions of isolation, switching and earth leakage protection of

electrical circuits.

B. The ELCB's shall have a residual current operated electro mechanical release.

C. The ELCB's shall incorporate a filtering device to eliminate unwanted tripping due

transient voltage.

D. A test push button is to prove operation.

E. A trip free mechanism is required to ensure that the unit can not be held closed against

an earth fault.

F. The tripping device is connected directly to the secondary of the current balance

transformer.

G. No amplifiers or rectifiers are to be used.

H. The breaker shall be double pole when used for single phase and 4 poles when used for

three phase circuit protection.

I. The ELCB's shall have 30mA or 100mA sensitivity as indicated in the drawings.

2.20 RCD + MCB / RCBO

A. Residual current operated circuit breaker with integral overcurrent protection.

B. RCBO's shall comply with BS EN 61009 providing protection against earth leakage,overload and short circuit protection.

C. RCBO's shall have 30mA sensitivity with type B tripping characteristic for power

circuits except for circuits feeding hand dryer it shall be 10mA sensitivity and shall

have 30mA or 100mA sensitivity with type C tripping characteristic for lighting and

inductive load circuits.

1. For three phase circuits a three pole circuit breaker with residual current device

clipped to the side of the breaker can be used. The tripping characteristic shall

be similar to what is described above.

2. The minimum short circuit rating of the breakers shall be 10 kA.

3. A test push button shall be incorporated to prove breaker operation.







2.21 TIME SWITCH CONTROL

A. Each time switch shall be of the quartz movement type with minimum 24 hour batteryreserve or operated by a 220 volt synchronous motor and of the type incorporating

separate motor supply and control switch terminals and be with a minimum of a 24

hour self winding clockwork spring reserve.

B. Unless more sophisticated operation is specified elsewhere, then each time clock shall

be capable of two 'on' and two 'off' operations every twenty-four hour period. Also, any

control time switch incorporated within the panel, shall be complete with an associated

bypass selection facility to manually override 'on/off'.

2.22 OVERLOAD RELAYS

A. These are to be used in conjunction with motor starters to provide protection againstoverloads, phase sequence, phase failure (single phasing) and under voltage conditions.

B. The relays shall be selected such that the full load current of the equipment protected

falls at the centre of the relays adjustment range.

C. Incase of Star Delta starter, the overload relays shall be placed on the main's contactor.

2.23 CONTROL RELAYS

A. Control relays shall be of the encapsulated plug-in type and incorporate visual

indication that the operating coil is energized.

B. Bases for relays shall be mounted horizontally, to ensure relay is vertical above the base

when the control cabinet is in its intended location, with screw type terminals, suitable

for receipt of spade type crimped/soldered lugs.

C. Adjustable timer delay relays used for the star delta starter shall ensure precise

reproducibility of the timing function. The relay shall have a linear setting scale over a

350 deg. rotation by means of knurled knob with timing guide marks. The relay shall be

equipped with two electrically separated time delayed contact one normally open and

one normally close.

2.24 INDICATION LAMP

A. These are generally used to indicate main's presence, run, trip, fault and to give fault

alarm or indicate any other function.

B. Indicator lamps shall be of the low voltage 24 volt transformer with twin LED lamp

type and accord with the signaling colors laid down in BS 4099. Minimum lens

diameter shall be 12.5mm and all lenses on a panel shall be of a matching size and

appearance and removable from the front for lamp replacement.

C. Terminations shall be screw grip to receive spade typing crimpled/soldered lugs.







2.25 SELECTOR SWITCH

A. They shall be of the complete rotary cam type rated to suit item controlled and fittedwith pointer type switching knob. Terminations shall be screw grip to receive spade

type crimped/soldered lugs.

B. Hand off auto selection switch shall have three positions with centre position off and

shall be key operated wherever necessary.

C. Selector switch when used along with the voltmeter it shall have 8 positions, i.e phase

to phase, 3 phase and 2 off position.

2.26 ACCESSORIES

A. Furnish the following accessories:1. Set of extension rails, if required.

2. Hoisting device for removing breakers.

3. Set of test plugs.

4. Levering out device, if required.

5. Manual maintenance closing lever, for electrically operated breakers.

6. Set of special tools and hardware.

PART 3 EXECUTION

3.1 INSTALLATION

A. Install work in accordance with approved standards, as per manufacturer’s

recommendations, and to the satisfaction of the Engineer.

B. After installation and leveling, render the entire switchboard rodent proof by any

means of steel plates.

C. Provide full length rubber mat in front of switchboard.

D. Installation of switchboard shall be fully in accordance with the Engineer’s

requirements. Switchgear and distribution boards shall be surface mounted or free

standing type, and shall be mounted on the building structure by means of suitable mild

steel straps or angle iron frames. Where distribution boards or switchgear are requiredto be directly attached to brickwork and the like, the fixing shall be by means of grouted

in bolts, or bolts of the expansion type. Any live metal in the distribution board shall be

screened with insulation material, so that circuit breakers can be replaced without any

danger to the operator.

E. The circuit breakers shall be situated to allow wiring to be carried out with sufficient

slack to enable them to be removed for inspection without disconnecting any circuit

wiring.

F. All main, sub-main and final distribution boards shall have a spare capacity and shall

also be provided with enough spare breakers as shown on the drawings.







G. All panel board and distribution boards shall consist of adequately rated circuit

breakers. Circuit breakers shall be temperature compensated at the manufacturer's

works to give the design current rating at 50ºC. Non-compensated breakers will not beapproved and a formal certificate will be required from the manufacturer confirming

that the breakers have been suitably temperature compensated.

H. Where single core cables enter or leave any item of metal clad switchgear, distribution

gear, etc., the cable cores shall all pass through the same aperture in the enclosure or

case of the unit concerned, to avoid the setting up of eddy currents. Where separate

holes are provided by the manufacturer for the cables, the holes shall either be cut out to

form a continuous slot, or alternatively the holes shall all be joined together with saw

cuts through the solid metal separating the holes. In all cases end plates shall be of

non-ferrous metal.

I. A special termination arrangement shall be provided to Engineer approval at the sub-main and main panel boards wherever the cable size exceeds the breaker terminal

capacity.

3.2 TESTS AT WORK

A. Routine tests to standards shall be carried out. Evidence that type test have been

carried out provided they are relatively to the configuration of the equipment offered,

may be acceptable to the Engineer and shall be made available.

B. A full visual check and electrical functional test shall be carried out on all apparatus

and every circuit. All wiring shall be inspected. It shall be verified that the FBA is

fully in accord with the requisition. Circuit breakers shall be closed and tripped at

their rated minimum and maximum trip and close supply voltage. Primary and

secondary injection tests shall be done on protection relays and CT circuits and

indicating and metering instruments. All labels shall be checked.

C. The test procedure shall be as follows:

1. Visual inspection to verify degree of protection creepage and clearance

distances.

2. All conductors and cables are checked for proper routing and all devices for

proper mounting.

3. Check effectiveness of all mechanical devices, e.g. handles, locks, interlocks,

operating devices, etc.4. Check panel conformity to drawing and Engineer’s requirements.

5. Megger test all main circuit through to final terminals. Insulation resistance

shall exceed 10 mega-Ohms. Record all measurements.

6. Flash test all main circuit at 2.5 KV for one minute. Record leakage current.

7. Repeat megger test to verify insulation resistance has not been affected by the

dielectric test.

8. Continuity tests of each circuit.

9. Function test of all circuit breakers switches, contacts, etc. and every circuit

to verify correct operation.

10. Primary and secondary injection tests of all relays, CT’s and indicating and

metering instruments.







D. Prior to energizing the switchboards, perform the following checks on site:

1. Operate the equipment through all design functions, including remote

operation, actuation of alarm and indicating devices, mechanical andelectrical tripping and closing and operation of the protective devices.

2. Insulation resistance measurements on the buses, phase to phase and phase to

ground, with all breakers in the fully connected position and contacts open.

3. Control circuit insulation resistance to ground.

4. Inspect all relays and protective devices, and verify settings in accordance

with the manufacturer’s instructions or the information in the Coordination

study.

5. Inspect current transformers and relays for correct polarity of connections and

the installation of jumpers on unused current transformer circuits.

6. Simulate the operations and check the logic of interlocks.

7. Manually close and trip each breaker checking and adjusting the main contact

alignment and wiring action as per manufacturer’s instructions.

8. Check the phasing on each side tie breaker, before closing.

9. Test protective relay operation for incomer air circuit breakers.

10. Tests to include Earth Loop Impedance test & RCD test where applicable. In

line with Abu Dhabi Wiring Regulations

E. Routine Tests:

1. Following routine tests are to be carried out by the switchgear assembler.

2. Inspection of assembly including inspection of wiring and electrical operation

3. Dielectric test: Checking of protective measures and of the electrical

continuity of the protective circuits.

4. Verification of insulation resistance.

END OF SECTION





Lighting Installations

16500 - Lighting Installations Page 1 of 3 Date: 09/08/2014

SECTION 16500

LIGHTING INSTALLATIONS

PART 1 GENERAL




1.2 SCOPE

A. Work is deemed to include supply and installation of:1. Lighting fixtures.

2. Cables with protective earthing conductors, conduits, trunking, raceways and

fittings, from outlet to upstream outlet, or to final branch circuit panelboard.

3. Lamps.

4. Fixing and supporting materials.

B. All fixtures are to have two cable entry holes.

C. Fluorescent lamp fixtures.

1. With built-in ballast. Single or two lamp ballasts are to be used in any one

fixture. Two lamp ballasts are to be lead-lag series type.

2. Each ballast is to have an external fuse and fuse holder rated in accordancewith manufacturer's instruction.

3. The ballast is to be of the conventional or electronic type, with the following

characteristics:

a. High power factor (greater or equal to 0.9)

b. Low power loss (less or equal to 10% of the lamp wattage)

c. Low self-warming (less or equal to 30ºC)

d. Total harmonic factor <20%.

4. The ballast is to shut down:

a. In response to component faults.

b. In response to lamp failure.

c. In no load operation.

5. The ballast is to be manufactured & certified for the specific lamp it controls.

6. The starter shall be of the electronic type.

D. High Intensity Discharge Lamp Fixtures:

1. Fixtures are to be supplied with mounting fixtures and control gear.

2. The ballast is to be of high power factor (greater or equal to 0.9).

3. RF suppression circuit is to be provided.

E. Low Voltage Lamp Fixtures:

1. Fixtures are to be supplied with transformers and accessories.







1.3 SUBMITTALS

A. The following data (but not limited to) shall be submitted for approval:1. Details on each fixture, lamp and control gear including manufacturer's

catalogue cuts, catalogue number, rating, material specification, overall

dimensions, operating characteristics, photometric data, etc.

2. Installation details.

PART 2 PRODUCTS


A. AS PER VENDOR LIST/DRAWING LEGEND

2.2 LIGHTING FIXTURES

A. Unless otherwise specified, fixtures are to be manufacturer's standard series.

1. Fixtures are to be fabricated, assembled and wired entirely at the factory. Site

work is to be restricted to reassembling parts dismantled at the factory for

packing and transportation.

B. Housing is made of not less than 0.6 mm thick sheet steel.

1. Sheet steel for reflectors should not be less than 0.8 mm thick.

2. Aluminum sheet for reflectors should not be less than 1.0 mm thick.

C. Light reflecting surfaces are to be finished with white baked enamel paint having areflection factor not less than 80%.

1. Finish is to withstand 72 hours exposure to an ultra-violet RS lamp placed

100 mm from surface.

D. Wiring to be not less than 1mm², insulated for 240 V supply. Wiring is to be

terminated on screw type insulated, terminal blocks.

2.3 TUBULAR FLUORESCENT LAMPS (26mm DIAMETER)

A. Normal start, bi-pin, rated as described on the drawings. Guaranteed rated life is to be

above 16000 hours. The luminous output shall be above:

1. 2700 lumens for 36 W lamps (for universal white) and 3250 (for othercolors).

2.4 PL FLUORESCENT LAMPS

A. Compact, with special bi-pin socket, rated as described on the drawings. Guaranteed

rated life is to be above 13000 hours and luminous output above the following:

1. 1200 lumens for 18W lamps.

2. 1800 lumens for 26 W lamps.










2.5 METAL HALIDE LAMPS

A. Lamps shall be rated as described on the drawings. Color of light is to be warm whitewith excellent color rendering properties. Luminous output to be above 12000 lumens

for 150 W lamps.

PART 3 EXECUTION

3.1 INSTALLATION

A. Install work in accordance with approved standards, as per manufacturer’s

recommendations, and to the satisfaction of the Engineer.

B. Fixtures are to be installed aligned, leveled and at uniform heights within one room orarea. Fixtures are to be supported with hangers to support weight of fixture.

C. Exact position of fixtures must be coordinated with the reflected ceiling plan.

D. Recessed fixtures in suspended ceilings are to be coordinated with exact dimensions

of ceiling tiles.

END OF SECTION




16500 – Lighting Installations - Catalogue

Type Specification

Store Area 2

T5, 28W x 2, surface mounted fluorescent luminaire, GRP housing, PMMA optic

diffuser

With

aluminum

reflector

with

high

efficiency

of

88%

,

stainless

steel

clips

and

IP65

Store Area 1

Surface mounted LED luminiare with Symmetrical optic, 54 LED,117W, 700mA, 6000K,

11290lm, frame and heat sink in 6060 T5 extruded aluminium, fixing flange in

moulded AISI 316 L stainless steel, composed of a double hook with security blocking

system, 4mm flat tempered glass and silicon gasket to guarantee IP 66.

Approved Manufacture

1, AEC, Italy

2, RUUD, USA

3. Philips, Holland

4. Vm elektro, Czech Republic





Fire Alarm System

16721 - Fire Alarm Systems Rev1 Page 1 of 5 Date: 8/18/2014

SECTION 16721

FIRE ALARM SYSTEM

PART 1 GENERAL




1.2 SCOPE

A. Work is deemed to upgrade the existing Fire Alarm System including:

B. The Scope of work shall include the modification of the existing fire alarm system to

match with the latest ceiling and architectural layouts and ensures that the AC

installation and fire protection & detection system .The whole installation is subject

to civil defense approval.

C. New detectors or devices shall be provided to achieve a fully functional fire alarm

system using the existing fire alarm control panel

D. Furnishing integrating connections and testing of the existing fire alarm equipment

required to form a complete, operative, coordinated system as per the new layout and

HVAC system. It shall include, but not be limited to, alarm initiating devices, alarmnotification appliances, auxiliary control devices, power supplies and wiring as shown

on the drawings and specified herein.

E. The Fire Detection and Alarm System shall be in accordance with the Al ain civil

defense requirements to protect the risk area set forth in the drawings.

F. The equipment shall form an integrated system of actuating devices laid in different

areas and connected to the control panel located at the gate house building. The

contractor shall submit a complete proposal with schematic drawings, list of materials

and original detailed catalogues of the equipment for consultant/client approval

before starting the work.

G. The supplier and installer of the system shall be approved by the local civil defense

authority.

H. The fire alarm system shall comply with requirements of NFPA Standard No. 72

except as modified and supplemented by this specification. Fire alarm system shall

shut down th HVAC system in case of fire

I. The system shall also be listed by Underwriter's Laboratories.

J. All peripheral devices shall be manufactured 100% by a single manufacturer.





Fire Alarm System


1.3 BASIC PERFORMANCE

A. Initiation Device Circuits and notification appliance circuits shall be wired as shownon the drawings.

B. Power for initiating devices and notification appliances must be from the main fire

alarm control panel.

C. A single ground or open on any system signaling line circuit, initiating device circuit,

or notification appliance circuit shall not cause system malfunction, loss of operating

power or the ability to report an alarm.

1.4 SUBMITTALS

A. General: Two copies of all submittals shall be submitted to the Engineer for review.

B. Shop Drawings:

1. Sufficient information, clearly presented, shall be included to determine

compliance with drawings and specifications.

2. Include manufacturer's name(s), model numbers, ratings, power

requirements, equipment layout, device arrangement, complete wiring point-

to-point diagrams, and conduit layouts.

C. Manuals:

1. Submit simultaneously with the shop drawings, complete operating andmaintenance manuals listing the manufacturer's name(s) including technical

data sheets.

2. Wiring diagrams shall indicate internal wiring for each item of equipment

and the interconnections between the items of equipment.

3. Provide a clear and concise description of operation which gives, in detail,

the information required to properly operate the equipment and system.

4. Approvals will be based on complete submissions of manuals together with

shop drawings.

D. Software Modifications:

1. Provide all hardware, software, programming tools and documentation

necessary to modify the fire alarm system on site. Modification includes

addition and deletion of devices, circuits, zones and changes to system

operation and custom label changes for devices or zones.

2. The system structure and software shall place no limit on the type or extent of

software modifications on-site. Modification of software shall not require

power-down of the system or loss of system fire protection while

modifications are being made.

E. Certifications: Together with the shop drawing submittal, submit a certification from

the major equipment manufacturer indicating that the proposed supervisor of

installation and the proposed performer of Contract maintenance is an authorized

representative of the major equipment manufacturer. Include names and addresses inthe certification.





Fire Alarm System


F. Guarantee: All work performed and all material and equipment furnished under this

Contract shall be free from defects and shall remain so for a period of at least one (1)

year from the date of substantial completion. The full cost of maintenance, labor andmaterials required to correct any defect during this one year period shall be included

in the submittal bid.

PART 2 PRODUCTS


To match with existing manufacturer

2.2 EQUIPMENT AND MATERIAL

A. Equipment and components shall be new, and the manufacturer's current model. The

authorized representative of the manufacturer of the major equipment, such as control

panels, shall be responsible for the satisfactory installation of the complete system.

B. All equipment and components shall be installed in strict compliance with each

manufacturer's recommendations. Consult the manufacturer's installation manuals for

all wiring diagrams, schematics, physical equipment sizes, etc. before beginning

system installation. Refer to the riser/connection diagram for all specific system

installation / termination / wiring data.

C. All Equipment shall be attached to walls and ceiling/floor assemblies and shall be

held firmly in place. (e.g., detectors shall not be supported solely by suspendedceilings). Fasteners and supports shall be adequate to support the required load.

2.3 CONDUIT

A. Conduit shall be in accordance with the specifications, minimum diameter 25mm.

B. Where possible, all wiring shall be installed in conduit or raceway. Conduit fill shall

not exceed 40 percent of interior cross sectional area where three or more cables are

contained within a single conduit.

C. Conduit shall not enter the fire alarm control panel or any other remotely mounted

control panel equipment or back boxes, except where conduit entry is specified by theFAP manufacturer.

2.4 WIRE

A. All fire alarm system wiring must be new and installed in conduits.

B. Wiring shall be in accordance with specifications / drawings and as recommended by

the manufacturer of the fire alarm system.

C. Wire and cable not installed in conduit shall be fire resistant.

D. All field wiring shall be completely supervised. In the event of a primary powerfailure, disconnected standby battery, removal of any internal modules, or any open





Fire Alarm System


circuits in the field wiring; a trouble signal will be activated until the system and its

associated field wiring are restored to normal condition.

2.5 HEAT DETECTORS

The heat detectors shall be rate of rise type with a fixed upper temperature limit. They shall be

solid state construction with a monitoring led and interchangeable plug in bases. The supply

voltage shall be between 17-28 V DC and nominal operating temperature -20o C to +90

o C.

The wiring shall be polarity insensitive. The detector shall be rated to IP 54.

The detector shall comply with EN 54 (BS 5445) as well as UL standards.

The detector shall be manufactured to comply with the quality assurance standards of BS EN

ISO 9002 1994.

2.8 ALARM BELL

Alarm bells shall be gong type and be suitable for mounting either directly on to a wall or to a

conduit box. The bell gong shall be constructed of steel with molded glass filled

polypropylene bases housing the motor/solenoid and terminal blocks. The bell shall be

polarized.

2.6 BREAK GLASS UNIT

Break glass units shall be standard model that fit on switch/socket box for flush installation.Testing shall be carried out by inserting a test key to move the glass, and operate the switch.

PART3 EXECUTION

2.1 INSTALLATION

A. Installation shall be in accordance with the civil defense authority ,NEC, NFPA 72,

as shown on the drawings, as recommended by the major equipment manufacturer,

and to the satisfaction of the Engineer.

B. All conduits, junction boxes, conduit supports and hangers shall be concealed infinished areas and may be exposed in unfinished areas. Smoke detectors shall not be

installed prior to the system programming and test period. If construction is ongoing

during this period, measures shall be taken to protect smoke detectors from

contamination and physical damage.

C. All fire detection and alarm system devices, control panels and remote annunciators

shall be flush mounted when located in finished areas and may be surface mounted

when located in unfinished areas.

D. Manual pull stations shall be suitable for semi-flush mounting as shown on the plans,

and shall be installed not less than 110cm, nor more than 120cm above the finished

floor.





Fire Alarm System

E. When the system is equipped with optional features, the manufacturer's manual

should be consulted to determine the proper testing procedures.

2.2 FINAL INSPECTION

A. At the final inspection a factory trained representative of the manufacturer of the

major equipment shall demonstrate that the systems function properly in every

respect.

2.3 INSTRUCTION

A. Provide instruction as required for operating the system. "Hands-on" demonstrations

of the operation of all system components and the entire system including program

changes and functions shall be provided.

END OF SECTION