1. general specification for transmission line

8/10/2019 1. General Specification for Transmission Line

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TRANSMISSION TECHNICAL SPECIFICATION

TENAGA NASIONAL BERHAD

Doc. No. Revision No. 0 Date 1 June 2011 of 21

Printed from EDMS System

17.0

CONTRACTOR’S RESPONSIBILITIES............................................................14

18.0

PROGRESS REPORTS AND MEETINGS........................................................14

19.0 TRANSPORTATION...........................................................................................14

20.0

EMPLOYER’S EQUIPMENT AND FREE ISSUE MATERIAL (Only forcontracts where equipment and materials are supplied by the Employer)15

20.1

Collection’s of Employer’s Material................................................................15

20.2

Procedure for Taking Delivery of the Employer’s Material..........................15

20.3

Loss and/or Damage of Employer’s Material ................................................16

20.4

Materials Accounted for ...................................................................................16

20.5

Return to Store of Surplus Employer’s Material ...........................................16

21.0

INSPECTION AND TESTING.............................................................................16

21.1 General................................................................................................................17

21.2 Type Tests ..........................................................................................................17

21.3

Costs of Type Test and Witnessing................................................................18

21.4

Notice of Type Test ...........................................................................................19

21.5 Testing Venue ....................................................................................................19

21.5.1

Electrical test only.............................................................................................19

21.5.2

Towers, Poles and Fittings (Mechanical Test) ..............................................19

21.5.3

Additional Witnessing.......................................................................................19

21.6

ROUTINE TESTS................................................................................................19

22.0

MAINTENANCE..................................................................................................20

23.0

FINAL RECORDS...............................................................................................20

24.0 LIVE LINE MAINTENANCE REQUIREMENTS (For Pole only) .....................21







1.0 GENERAL

This document describes the General Requirement of the Contract. Among the items

described in this document are the required standards, service and environmentalconditions, Contractor’s and Employer’s responsibilities.

2.0 STANDARDS

All plant and materials shall be designed, manufactured and tested in accordance withthe latest revision of the International Electrotechnical Commission (IEC), BritishStandards (BS) or Institute of Electrical and Electronics Engineers (IEEE) standardsexcept where specifically directed otherwise.

If the specification conflict in any way with any or all of the above standards, thespecification shall have precedence and shall govern.

The applicable standards are as declared in the appropriate equipment and materialspecification.

If a new material or equipment to be offered conform to Standards other than thosespecified herein or published by the I.E.C., a copy of the proposed Standards (Englishversion) shall be supplied under the contract.

3.0 SERVICE AND ENVIRONMENTAL CONDITIONS

All plant and materials shall be subjected to and be suitable for commercial operation inthe following service and environmental conditions:

Service and Environmental Conditions

Location 3º north of equatorClimate TropicalAltitude (m) 1000Ambient temperature (ºC) 32Relative humidity (%) 80-100Isoceraunic level (days per annum) 180 per annumAverage rainfall (mm) 2540 per annumWinds (km/h) < 80Wind gusts (maximum 3 seconds; m/s) 30

Natural pollution level ESDD (mg/cm2) 0.062

The plant and materials used must be suitable for the humid conditions under which theplant and materials will experience in commercial operation.







4.0 UNITS OF MEASUREMENT

Metric or System International (S.I.) units of measurement shall be employed in allcorrespondence, Technical Schedules and drawings. Angular measurement shall be indegrees, with 90°comprising one right angle.

5.0 ELECTRICAL PARAMETERS AND CLEARANCES

The system frequency is 50 ± 0.5 Hz. The transmission line electrical parameters andclearances are tabled below:

5.1 Minimum clearances

The minimum conductor clearance at 75°C shall be maintained at the maximumconductor sag:

Nature of Crossing 500kV(m)

275kV(m)

132kV(m)

Minimum clearances from conductor to ground at75°C

10 7 .31 7.01

Railway tracks 15 15 15

Roads (2 way with bitumen and more than 5mwidth)

11 10 10

Roads (with truck traffic) 12 10 10

Highway (PLUS) 18 15 15

Waterways not suitable for sailboats 10 7.31 7.01

Waterways suitable for sailboats 15 12 11

Paddy fields 13 7.31 7.01

To other electric power line wires (line or earth) 6 4.57 4.57

Communication lines 6 4.57 3.66

Gas/Pipe line 13 10 10

To metal clad or roofed buildings, or otherbuildings or structures upon which a man maystand

6 5.18 4.57







5.4 500kV Transmission Line

Electrical Clearance Data Distance

Minimum clearances between the energized parts of the conductorsupport assembly and the earthed steel structure is as follows.

Normal Operating Condition

Top and Middle Phase Positions mm

Bottom Phase Positions mm

Extreme Wind Condition mm

4000

4300

2000

5.4.1 Normal Operating ConditionThe minimum clearance listed for the Normal Operating Condition is required toprovide adequate insulation to the support structure during switching andlightning surges of voltage on the transmission line. The minimum clearance willbe maintained from the energized part box, to be nearest surface of the supportstructure.

The energised parts box encompasses for the conductor clamps to be displacedby a 29.3 kg/m2 wind on the conductor.

5.4.2 Extreme Wind Condition

The minimum clearance listed for the Extreme Wind Condition is required toprovide adequate insulation to the support structure during operating conditions

not including the occurrences of surges of voltage on the transmission line. Theminimum clearance will be maintained from the apex of the V-string assembly,displaced by 77.4kg/m2 wind, to the nearest surface of the support structure.

6.0 QUALITY ASSURANCE AND QUALITY CONTROL (QA/QC)

6.1 General

As a means of assuring that the performance of the Works fulfils the requirements of theContract, the Contractor shall establish and implement an approved Quality Assuranceand Quality Control (QA/QC) program. A Quality Manual shall be submitted by the

Contractor to the Engineer for approval before commencement of site work.

6.2 Inspection And Audits

The Contractor’s work and related records shall be subject to periodical inspection andaudit by the Engineer to assure compliance to the QA/QC program that was set up. Arequest for corrective action may be issued by the Engineer upon detection of non-compliance by the Contractor. The Contractor shall correct in timely manner all suchdeficiencies that were identified.







6.3 Rejection

All materials or equipment furnished and delivered under the Contract shall be subject toinspection. If any items or articles are found not to meet the Specifications, the item or anyfaulty portion thereof shall be rejected. The fact that the materials or equipment haveinitially been successfully inspected, tested and accepted by the Engineer shall not relievethe Contractor of responsibility to make good any defects before Taking-Over Certificate(TOC) is issued.

6.4 Inspection And Testing Prior To Delivery

Inspections by the Engineer at the Contractor’s mill, factory, yard or warehouse shall be inaccordance with the following conditions :-

a) Access

The Employer or his representative shall have the right to inspect the Contractor’s

or sub-contractor’s work during manufacture and undertake such tests from time totime as deemed advisable, provided no delay in production of acceptable materialsor equipment is caused thereby. The Contractor shall furnish, at his own expense,reasonable facilities including tools and instrumentation for such inspections.

b) Witness Tests

Mill or factory witness tests, shall be made in the presence of the Engineer. Allrelated costs related to the tests for the overseas manufacturer only shall be borneby the Contractor, except for the compensation and expenses incurred by theEngineer. If the component or material to be inspected or tested is not ready at thetime specified by the Contractor, or if the component or material fails the test carriedout, any additional costs incurred to the Employer from these delays shall be

charged to the Contractor.

c) Receipt Inspection

All materials or equipment purchased under the Contract may be inspected at thespecified receiving points, and there be accepted or rejected by the Engineer.Inspection will include the necessary testing for determining compliance with theSpecifications. All expense of initial acceptance tests shall be included in theContract. The expense of subsequent tests due to failure of materials orequipment first offered will be charged against the Contractor.

d) Quality Assurance (QA)

The Contractor shall maintain a QA program which specifies that all equipment,materials, and services under the Contract, whether manufactured or performedwithin the Contractor’s plant or at any other source, shall be controlled at allpoints necessary to assure conformance to Contractual requirements. The QAprogram shall provide for the prevention and ready detection of discrepancies,and for timely and positive corrective action.If required, the Contractor shall make objective evidence of quality conformancereadily available to the Engineer. All instructions and records for qualityassurance must be controlled and kept by the Contractor.







e) Release For Shipment

The Contractor shall not ship materials or equipment until they are released by theEngineer. The Contractor shall notify the Engineer in advance of any shipment.

7.0 PERMIT TO WORK (PTW)

The Contractor shall engage an Energy Commission Electrical Competent Engineer forthe purpose of obtaining the Permit to Work (PTW) for the supervision of works in livesubstations / vicinity of live plant / transmission lines. A copy of the supervisor’sCertificate of Competency shall be submitted for verification by the Engineer or hisrepresentative. The operation of connections to any items of equipment once made liveshall be subjected to Tenaga Nasional Berhad (TNB)'s Safety Regulations which requirework permits to be issued by an Authorised Person before any work can be carried out.The Competent Engineer shall not be deemed necessary to be on site at all the time.However, the Competent Engineer shall nominate his electrical authorised person (at leastChargeman or more than 5 years experience in transmission line works), and acceptable toTNB where he shall than be present at all time for the supervision of works in livesubstations / vicinity of live plant / transmission lines. The Competent Engineer shall alsomade himself/herself present during any switching operation or issuance of PTW for thework.

8.0 SERVICES

8.1 Site Office

The Contractor shall provide such temporary buildings as may be necessary for office

accommodation for the Contractor's engineers and site staff during the erection of theWorks. At least one room, complete with one(1) set of tables, chairs, cabinets and reliablecommunication equipment shall be reserved solely for the use of the Employer'ssupervisory site staff as a site office. The cost of all these shall be deemed to be included inthe Contract Price.

8.2 Storage Facilities

The Contractor shall in all cases make his own arrangements, at his own expense, withlandowners for suitable storage areas and camp sites, both within and outside the rentice.

9.0 CONSTRUCTION UTILITIES

All construction utilities required for the Contractor’s site staff (including the site office) andundertaking of the Works shall be provided and be the responsibility of the Contractor. Allrelated costs shall be deemed included in the Contract Price.

The required utilities shall include the following:-

a) Telephone and other site communication requirements.b) Temporary power facilities.







c) Temporary lighting: conductors shall not be less than 12 AWG copper, and be insulatedfor 600 volts. A fuse shall be provided for the protection of each circuit.

d) Water for construction use and drinking (including related piping, hoses and valves).e) Sanitary facilities, including provision of chemical toilets at site.f) First aid facilities.

g) Trash disposal, including removal of any construction debris from site at weeklyintervals.

h) Fire protection (all insurance requirements must be met).

10.0 CONTRACT LINE TERMINATIONS

The Contract includes the provision and erection of slack spans between the terminaltowers and substation gantries or any other termination structures.

11.0 DESIGN AND CONSTRUCTION

Each of the several parts of the Plant shall be of such construction and design as to givelong continuous service with high economy and low maintenance costs. All workmanshipshall to be of the highest quality throughout. The design, dimensions and materials of allparts shall be such that the stresses to which they are subjected under the most severeconditions encountered in service shall not render them liable to distortion or damage.Welding, filling or plugging of defective parts will not be permitted without the approval, inwriting, of the Engineer.

All equipment shall operate without undue vibration and with the least possible amount ofnoise so as not to be a nuisance to the environment. All apparatus shall be designed toensure satisfactory operation under the atmospheric conditions prevailing in the area wherethe lines are to be built and under such variations of load and voltage as may occur under

normal systems working conditions.

The design of all line supports, conductors, spacers, insulators and fittings, shall be suchas to minimise the risk of damage to any part of the lines due to deterioration, or damagein service. The design shall incorporate any reasonable precaution and provision for thesafety of those concerned in maintenance of the Contract Works and all associatedworks supplied and executed under other contracts.

All corresponding parts shall be made to gauge, and shall be inter-changeable whereverpossible throughout the Contract Works such as to facilitate the fitting of replacementparts.

All poles and fittings design shall be designed to accommodate the bare hands live line

maintenance requirements. Established live line maintenance consultants/ experts shallbe engaged in designing the plant equipment. All related costs shall be deemed includedin the Contract Price.







12.0 PACKING

Each item shall be packed properly and protected for shipment and transport from theplace of manufacture to the Site, and outdoor storage under the prevailing climatic

conditions.

13.0 DRAWINGS

The attention of the Contractor are drawn to the local statutory requirement under theREGISTRATION OF ENGINEERS ACT AND REGULATIONS (ACT 138 - REVISED1988), PART I, CLAUSE 8, that only Professional Engineers (of the relevant discipline)registered with the Board of Engineers, Malaysia (BEM), may certify and submit plans,drawings, schemes, proposals, reports, designs or studies to any person or authority inMalaysia. This requirement shall be strictly enforced without exception.

The drawings for approval, review or information shall be submitted in triplicate unlessotherwise requested by the Engineer after the Contract commencement date. Thecontractor shall commence with drawing submissions within 56 days from contractcommencement date. For drawings where the contractor is required to Revise andResubmit, the Contractor shall do so within 14 days.

The approval of the drawings shall not exonerate the Contractor from any responsibilityto make good any connection, detail arrangement and scheme connected with theworks, as may be found necessary during the later stage of testing and Site inspections.The approval or consent or review shall not:

1. be construed as acceptance of any non conformance which has not been

declared,2. be a basis for acceptance of any variations to the contract, and3. relieve the contractor from any contractual obligations or responsibilities.

At least 28 days before commencement of the works, four (4) sets of approved andbound plant and ancillaries drawings, installation, operation and maintenance manualsshall be submitted to the Engineer.

Prior to the issue of any Taking Over Certificate, the Contractor shall supply to theEngineer four (4) bound hard copies and three (3) softcopies of all as-built drawings,installation, operation and maintenance manuals for each substation in a form ofAutoCAD for drawings and Portable Document Format (PDF) format for manuals.

13.1 Drawings before Commencement of the Works

The following drawings must be prepared by Contractors before work commence

forapproval, review or information as the followings:-

a) Outline and general arrangement for all basic types of towers or supports,including proposals for hillside leg extensions.

b) Details of types of foundations for the above.







c) Diagram of external loads for all towers.

d) Electrical clearance outlines for all towers.

e) Conductor and earthwire cross-section.

f) Conductor spacers.

g) Conductor tension clamps and jumper terminals.

h) Earthwire tension clamps and jumper terminals.

i) Conductor non-tension clamps.

j) Earthwire non-tension clamps.

k) Conductor mid-span joints.

l) Earthwire mid-span joints.

m) Suspension insulator strings and clamps with all fittings.

n) Tension insulator strings and clamps with all fittings.

o) Earthwire suspension clamps and general arrangement.

p) Vibration Dampers for conductor and earthwire.

q) Conductor final tension charts.

r) Earthwire final tension charts.

s) Drawings and/or other data indicating the method of tension stringing to beadopted.

Where the Contract requires the supply and installation of the Optical Fibre Groundwire(OPGW) and Optical Fibre Approach Cable, the following drawings must be prepared byContractor:

a) OPGW / Approach Cable conductor cross-section.

b) OPGW dead-end assembly and jumper terminals.

c) OPGW non-tension clamps.

d) OPGW suspension assembly with all fittings and general arrangement.

e) OPGW vibration damping system.

f) OPGW final tension charts.

g) OPGW joint / distribution boxes.

h) Drawings and / or other data indicating the method of OPGW tension stringingto be adopted.

13.2 Working Drawings

Working drawings of the materials to be used are to be submitted to the Engineer forapproval before the work is put in hand within three months of Contract award notificationare as follows:-

a) Stress calculations, foundation loading data, wire clearance diagrams, generalarrangement drawings and erection diagrams for every type of tower (and towerextension), showing details of insulator and earth conductor clamp attachments.Material Lists giving total weight of steelwork above and below ground. Foundation







drawings showing all types of foundations complete with all necessary informationfor stub setting.

b) Special towers, extensions and parts of towers (where required), andfoundations with other details as in item (a) above.

c) General arrangement drawings of each type of insulator set and earthwire setcomplete with all fittings.

d) Detail drawings of all conductor, earthwire and insulator fittings including joints,clamps, vibration dampers and spacers and individual insulator set and earthwireset fittings.

e) Counterpoise earthing connections.

f) On-site conductor and earthwire joint test instrument.

g) On-site galvanising thickness test instrument.

h) Profiles and strip plans with proposed tower positions.

i) Cross-sectional drawings indicating leg extensions for uneven ground.

j) Detail drawings of all crossarm connections.

k) Initial and final Conductor and Earthwire Sag-Tension and Erection Charts.

l) Material Schedules

m) Sag Templates and Tower Height Templates.

In addition to the working drawings listed above, the Contractor shall submit drawings ofany other item of plant to be supplied under the Contract and any arrangement to beexecuted on the site.

All drawings shall have leading dimensions only. All detailed drawings, either tower andsupports, shall have provisional dimensions of principal members and shall indicate thenecessary clearance dimensions for still air and maximum swing of insulators and jumperscalled for in this Specification.

The conductor and earthwire tension charts shall show final sags and tensions for a rangeof equivalent spans between 100 to 500 metres, in still air at maximum, everyday andminimum temperature and the tension at minimum temperature under full wind.

13.3 Record Maps and Schedules

During the progress of the work the Contractor shall record on profiles, approved lineschedules and on a set of Survey Maps of approved scale such particulars as will allow anaccurate reference to be made afterwards in case of any faults or projected modifications to

the lines. The maps and / or profile sheets shall show the exact coordinates of everysupport with approved reference marks so that tower types, foundation types, insulator settypes and number of circuits can be ascertained quickly.

The maps and profiles shall be supplemented, by sketches where necessary, to delineateboundary positions of towers which cannot be clearly indicated on the maps. The dataincluded on the maps, profiles, sketches and line schedules shall be verified by a qualifiedlicensed surveyor (registered under the requirements of Act 458 of the Licensed LandSurveyors Act 1958 ) and to the approval of the Engineer, to whom facilities shall be givenfor examining such records during the progress of the work.







The maps, sketches and not less than two copies of the profiles and schedules, togetherwith its’ softcopy shall be prepared for the Engineer, but will be in the charge of theContractor until the completion of the particular section of the Work to which they refer.They shall be handed over before issue of the Taking-Over Certificate (TOC).

14.0 SUB-CONTRACTED PLANT AND MATERIALS

Three (3) copies of all sub-contracted plant and material Orders are to be submitted to theEngineer for approval whenever any such order is placed. Copies submitted should beclearly marked on the first page with the reference and title as stated in Clause 13.0 and astatement that the plant and material are subject to satisfactory inspection by the Engineer.

The Contractor shall provide the names and details of the selected local sub-contractors forthe Engineer’s approval before such sub-contracts are placed. The Engineer reserves theright to withhold his consent to local sub-contract arrangements if such is consideredunsuitable, but consent will not be unreasonably withheld.

15.0 DATES FOR COMPLETION

The dates of readiness for inspection and testing, delivery and completion of the ContractWorks shall be as stated in Schedule E, which also sets out the dates by which theContractor shall require access to the Site. The Engineer may vary from time to time any ofthe work or the dates stated in Schedule E, for the execution of the work detailed in theSchedules or part thereof.

Any costs incurred by such variation shall be certified by the Engineer and added to ordeducted from the Contract Price. The Contractor shall carry out all necessary surveys atan early date after the commencement of the Contract in order to establish final quantities

as soon as possible for the manufacturing programme.

16.0 ERECTION AND CHECKING AT SITE

All work at Site shall be carried out in such a manner as not to obstruct other contractors onsite or the operation of existing substations. The execution of all works included in theContract shall be supervised by a sufficient number of qualified representatives of theContractor, and full facilities and assistance are to be afforded by the Contractor for theEngineer to check the Works. The Contractor shall obtain from the Engineer details of theparts which the Engineer wishes to inspect, but such inspection shall in no way exoneratethe Contractor from any of his obligations. The Contractor, if requested by the Engineer,shall open up for inspection before erection any equipment which has been deliveredpartially-assembled to Site.

The Contractor shall keep the Site, on which he erects or stores plant, reasonably clean,and shall remove all waste materials accumulated from the Works. On completion of theWorks, the Site shall be left clean and tidy to the satisfaction of the Engineer. Any damagedone to existing buildings, structures and plant, or property belonging to the Employer andothers, shall be made good at the Contractor's expense and in a reasonable time. TheContractor shall be responsible for the integrity of all electrical and mechanical connections







to all equipment or plants supplied under the Contract before such equipment or plant iscommissioned.

17.0 CONTRACTOR’S RESPONSIBILITIES

Unless otherwise specifically stated in the Tender with full supporting explanations, theContractor shall be deemed to have concurred to being a practical manufacturer withsufficiency in design and layout of the Works to ensure reliability and safety in operation,freedom from undue stresses and satisfactory performance in all other essentials as aworking plant.

The Contract shall include the whole of the Works which are described in or implied by theContract. All matters omitted from the Contract, which may be considered to be necessaryfor the efficiency, stability and completion of the Works, shall be deemed to be included inthe Contract Price. Works shown on the Tender Drawings and not mentioned or describedin the Specification or vice versa shall nevertheless be deemed to be included in theContract, and their execution shall be covered by the Contract Price.

The Engineer shall set out terminal tower positions from which the Contractor on his ownresponsibility shall set out all other Works, but under the direction and to the satisfaction ofthe Engineer, according to the working drawings supplied or approved by the Engineer.The Contractor shall provide all labour, stakes, instrumentation and other provisionsdeemed necessary for the use of the Engineer for checking such setting out and periodicmeasurements of Works executed and materials supplied. The Contractor's representativeon Site, or his nominated deputy, shall be given full responsibility to enter into negotiationsregarding matters arising out of site erection works, so that the works may be executed withminimum delay.

The execution of all works on Site, including erection and commissioning of Works,

included in the Contract shall be supervised throughout by a sufficient number ofexperienced and qualified representatives of the Contractor. Unless otherwise specified,the Contractor shall provide, to the Engineer’s satisfaction, all labour and equipmentrequired for the completion of the Works.

18.0 PROGRESS REPORTS AND MEETINGS

During the execution of the Contract, site progress meetings shall be held at monthlyintervals. If during the execution of the Contract, the Engineer considers the progressposition of any section of the work to be unsatisfactory, the Engineer shall at liberty calladditional meetings as necessary either at the Employer’s Head Office or at Site. Aresponsible representative from the Contractor shall attend such meetings. Access to the

Contractor's and Sub-Contractor's works shall be granted to the Engineer at all times forthe purpose of ascertaining progress.

19.0 TRANSPORTATION

The Contractor shall bear all expenses in connection with transportation to Site of all plant,materials, equipment and tools needed for the purpose of the Contract including warehouserent, handling and other charges. Materials supplied by the Employer will be available fromthe Employer's store, or directly from the manufacturer's works in Peninsular Malaysia.







The relevant rates stated in the Schedule of Prices shall also include the cost of transport ofsurplus materials provided by the Employer back to the Employer's store.

The Contractor shall observe any regulations which limit loads on roads and bridges overwhich materials may be conveyed. The handling and storage of any plant at Site shall be

the responsibility of the Contractor without any liability to the Employer. The Contractorshall arrange for the protection, to the satisfaction of the Engineer, of all materials againstcorrosion, mechanical damage and theft during storage and erection at Site.

The Contractor shall request the Engineer’s permission to deliver any item of Goods tothe Site. No Goods shall be delivered without this permission, which shall not relieve theContractor from any obligation.

20.0 EMPLOYER’S EQUIPMENT AND FREE ISSUE MATERIAL (Only for contracts whereequipment and materials are supplied by the Employer)

20.1 Collection’s of Employer’s Material

The dates of collection of materials by the Contractor shall be provided by the Employerafter the Kick-off Meeting. The conductors supplied by the Employer will be made availableat the Employer’s store(s) and/or the manufacturers' premises in Peninsular Malaysia. Atleast four (4) weeks before the date of collection, the Contractor shall give the Employer anofficial notice of request to collect the conductors. Any additional charges due to failure onthe Contractor's part to collect the conductors by the dates agreed, shall be borne by theContractor.

The Contractor shall insure the full value of conductors and / or materials supplied by theEmployer; the costs for providing the insurance are deemed to be included in the ContractPrice.

20.2 Procedure for Taking Delivery of the Employer’s Material

When the Contractor or any person acting on his behalf, presents himself at theEmployer's stores, or at the manufacturer's premises for the purpose of collecting materialto be provided by the Employer, the Contractor or person shall produce to the Employer’sIssuing Officer, a written authority on the official letterhead of the Contractor duly signed bya responsible officer indicating that the bearer of the authority is acting on the Contractor’sbehalf. The authority shall also show the Contract Number and the work for which thematerial is required. When taking delivery at the Employer's stores, the Contractor shall beresponsible for loading the material on to his vehicles.

The Contractor or his authorised representative shall, upon collection of the material, giveto the Employer’s Issuing Officer a receipt for the material received by signing theEmployer's official goods receipt and thereafter shall be responsible for the safe custody ofsuch material. The Contractor shall be responsible for checking the quantities of materialsissued to him with the quantities recorded on the goods receipt at the time of collection.Should the check indicate a discrepancy between quantities received and quantities shownon the goods receipt, the Employer's Store Officer shall be advised immediately.







20.3 Loss and/or Damage of Employer’s Material

No allowance will be made by the Employer for any losses of, or damage to, materialsprovided to the Contractor. Should any materials provided by the Employer prove to beunsuitable for use then they shall be returned to the stores as specified in Clause 20.5. The

costs of returning and replacing such materials in accordance with the above shall bedeemed to be included in the Contract Price.

20.4 Materials Accounted for

The Contractor shall account for all materials supplied to him by the Employer by includingthem in the works or by returning them in good condition to the Employer's store(s). Forthe purpose of determining quantities of conductor and overhead earthwire issued to theContractor, the issued length shall be the length which is the sum of the length marked onfull drums issued to the Contractor, plus the lengths on partially used drums so issued(lengths on partially used drums to be mutually agreed).

For the purpose of determining the quantity of conductor and earthwire used by theContractor in the Contract, the respective used length of conductor and earthwire shall bethe respective sums of the span lengths, as shown on the line schedule, of each conductorand earthwire in the final route of the line plus fixed allowances for sag and the effect ofterrain of 3/4 of 1 percent of the sum of such span lengths in the case of conductor and3/10 of 1 percent of the sum of such span lengths in the case of earthwire, plus the sum ofthe lengths of new conductor which has not previously been pulled through stringingsheaves, and which is used for jumpers.

20.5 Return to Store of Surplus Employer’s Material

In the event that surplus material is supplied by the Employer, for any reason whatsoever

and for any amount, the respective material shall be returned to the Employer's store.

The Contractor shall be responsible for packing, loading, delivery and unloading of thesurplus material and shall give the Officer in charge of the recipient store one week's noticeof intent to deliver the material. Before dispatching to Store, all material and its packingshall be inspected and approved by the Employer's representative. Delivery of materialmust be completed within the normal working hours of the Store and a receipt shall beobtained by the Contractor for any material delivered to Store by him or by hisrepresentative.

All surplus conductor and earthwire shall be neatly packed or wound on to sound drumsand battened. A suitable label shall be attached to each drum stating the size and quantityof conductor and earthwire it contains. The costs relating to the returning of surplusmaterials as specified above shall be deemed to be included in the Contact Price.

21.0 INSPECTION AND TESTING

The Plant will be inspected and tested before and during manufacture, construction,erection and on completion by the Engineer and the Employer’s inspecting agent.







The Contractor shall arrange all tests’ schedule systematically in order for the appointedEmployer’s representatives to witness as many tests as possible during each visit to therespective works. The time and duration of the visits shall be finalised after thesubmission of the Contractor's Work Schedule.

Every facility shall be provided by the Contractor to enable the Employer to carry out thenecessary inspection of the plant and the costs of all tests and preparation of test recordsare to be borne by the Contractor. The passing of such inspection or test will not, howeverprejudice the right of the Employer to reject the Plant if it does not comply with theSpecification at a later stage in the Contract or give complete satisfaction in service.

Instruments shall be approved and shall, if required by the Employer, be calibrated by anapproved International Laboratory at the expense of the Contractor.

Before any plant or material is packed or dispatched, all tests called for shall have beensuccessfully carried out in the presence of Employer representative unless otherwiseagreed. No Plant shall be dispatched without expressed authority of the Employer.

If the component or material to be inspected or tested is not ready at the time specified bythe Contractor, or if the component or material fails the test carried out, any additional costsincurred to the Employer from these delays shall be charged to the Contractor.

Adequate notice shall be given when the Plant is ready for inspection or tests and everyfacility shall be provided by the Contractor and his Sub-Contractors to enable theEngineer or the Employer’s inspecting agent to carry out the necessary tests.

The recorded results of all Type Test and Factory Acceptance Tests shall be verified bythe Employer’s representative and triplicate copies shall be submitted to the Employerimmediately. A similar set of test results shall also be included in the Operation andMaintenance Manual.

21.1 General

Tests to performed on all equipment shall be in accordance to the latest revision of therelevant IEC or British Standards except where departures therefrom and themodifications there to are embodied in the Specifications. For Plant not covered by anuIEC or BS nor specifically mentioned in this Specification, such tests are relevant shallbe agreed with the Engineer.

Should the plant or any portion thereof fail under test to give required performance,further tests which are considered necessary by the Engineer shall be carried out by theContractor and the whole cost of the repeated tests shall be borne by the Contractor.

This also applies to tests carried out at the Sub-Contractor’s works.

21.2 Type Tests

All imported equipment offered shall comply with TNB Specification and SHALL HAVESATISFACTORILY PASSED FULL TYPE-TESTS considered mandatory by the relevantIEC/BS/other standards. The Certificates of Complete Type-Test and/or Reports of thesetests shall be submitted together with the Tender.







Type Test Certificate Of Complete Type Test is not required for equipment of the samemodel and rating which has been installed in TNB system.

Where the type tests have been performed not on the exact equipment model and ratingoffered, the applicability of the test report to the offered equipment shall be verified by

STL/STLA or Independent Accredited Laboratory

Additional tests are those other than the mandatory IEC/BS/other requirements,including tests classified as Special Test or Additional Test or Mandatory Test whereapplicable as stated in the standards and TNB specified type tests. For these tests, if thetype tests certificates and/or reports are not submitted with the bid, the tests shall beperformed and the Certificates and/or reports furnished subsequent to tender award inaccordance to the specification

For imported equipment already installed in TNB and locally manufactured equipment, ifnot fully type tested, the outstanding type test shall be carried out after the contract isawarded.

For tests performed subsequent to tender award, should the plant or any portion thereoffail under test to give the required performance, subject to the Engineer’s approval, theContractor after due modification and rectification may perform only ONE re-test. In theevent the re-test fails, subject to the Engineer’s approval, the Contractor shall proposeand supply a different make of equipment that has already conformed to thespecification.

Other Plant and Material that are not listed above, the type test to be carried out at anindependent accredited laboratory or at manufacturer’s laboratories (for equipmentwhich only the manufacturer can perform the test) as approved by the Engineer, and tobe witnessed by the Employer’s representatives.

Type test certificate and report format shall comply with STL/STLA guidelines and/or tothe satisfaction of the Engineer.

The recorded results of all type tests shall be verified by the Engineer or hisrepresentative and triplicate copies to be submitted to the Employer immediately afterthe tests for record purposes. The same set of test results should be included in theOperation and Maintenance manual.

21.3 Costs of Type Test and Witnessing

The costs of all Type Tests, Special Test or Additional Test or Mandatory Test whereapplicable as stated in the standards and TNB specified type tests, certificates, reports

and verification process as required by the specification as well as the travel andaccommodation expenses of two (2) of the Employer’s appointed representativeswitnessing the test shall be borne by the Contractor and shall be deemed to be includedin the Contract Price. The air travel shall be by Business Class. The hotelaccommodation shall have business centre and, unless otherwise approved, rated 4 starminimum.







21.4 Notice of Type Test

TNB requires at least 35 days written notice for the witnessing of the type and/oradditional tests.

21.5 Testing Venue

The short circuit tests shall be performed at any one of the accredited STL memberlaboratories such as those accredited by ASTA, CESI, ESEF, KEMA, PEHLA, SATS,STLNA, CPRI and JISC

21.5.1 Electrical test only

All tests other then short circuit test may be performed at any one of theaccredited STL member laboratories as stipulated above or at any IndependentAccredited Laboratory and shall be approved by the Employer. Tests performedat manufacturer’s work shall be witnessed by a representative of STL memberlaboratory or an Independent Accredited Laboratory.

21.5.2 Towers, Poles and Fittings (Mechanical Test)

All tests other then short circuit test may be performed at Independent AccreditedLaboratory and shall be approved by the Employer. The tests shall be witnessedby two (2) of the Employer’s appointed representatives and the Report shall beapproved by two (2) of the Employer’s appointed representatives. The testprocedure, including passing or failure criteria, shall be in accordance with therequirements of the equipment specification.

21.5.3 Additional Witnessing

In addition to Clause 3.2.4, all Type Tests and/or Special Test or Additional Test

or Mandatory Test where applicable as stated in the standards and TNBspecified type tests to be performed subsequent to Tender award shall also bewitnessed by the Employer particularly to ensure that the tests are carried outaccording to TNB specifications and requirements.

At least a group of by two (2) of the Employer’s appointed representatives willwitness the whole type test. The group will be available for duration of at mosttwo weeks at one venue. Should the test schedule requires more than a groupdue to extended duration and/or multiple venues to witness the full tests, allrelated costs shall be deemed to be included in the contract price.

21.6 ROUTINE TESTS

Routine tests shall be carried out on each main equipment or components ofmain equipment ordered under this Contract, irrespective whether or not the typetests for the equipment are required to be performed as specified below. The testshall be strictly in accordance with the requirements set out in the appropriateIEC, BS, IEEE or other International Standards relevant to the equipmentstipulated in this specification.

The costs of the Routine-tests shall be borne by the Contractor and shall bedeemed to be included in the Contract Price.





k) Profiles and strip plans.l) Route maps / plans including exact coordinates of tower locations.m) Line schedules.n) Tower identification / warning plates.o) Earthing arrangement diagrams

p) Any special drawings required for the Contract.

A list showing drawing numbers and titles covering all record drawings shall form part of thefinal records. Three copies of these documents shall be handed over to the Engineerbefore issuance of Taking-Over Certificate.

24.0 LIVE LINE MAINTENANCE REQUIREMENTS (For Pole only)

Transmission line poles and hardware fittings shall be designed to accommodate the liveline maintenance requirements. Established live line maintenance consultants / expertsshall be engaged by the Contractor in designing the poles, insulators and conductor fittings.The contractor shall ensure that the live line maintenance must be workable. All cost shall

be deemed included in the Contract Price.

1. general specification for transmission line

Documents