sans 1765-2003

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ICS 29.240.99

ISBN 0-626-15066-3

SANS 1765:2003 Edition 2

SOUTH AFRICAN NATIONAL STANDARD

Low-voltage switchgear and controlgear assemblies (distribution boards) with a rated short-circuit withstand strength up to and including 10 kA Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001

tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za © Standards South Africa 2003


SANS 1765:2003 Edition 2 Table of changes

Change No. Date Scope

Abstract

Is applicable to stationary or movable low-voltage switchgear and controlgear assemblies that have a rated short-circuit withstand strength up to and including 10 kA, a rated voltage that does not exceed 1 000 V a.c. at frequencies not exceeding 50 Hz, or 1 500 V d.c., that are intended for use in the generation, transmission, distribution and conversion of electrical energy and the control of electric energy consuming equipment, and are designed for use under normal or special service conditions.

Keywords

controlgear, distribution boards, electrical installation, electrical safety, safety, switchboards,

switchgear.

Foreword

This South African standard was approved by National Committee STANSA SC 67B, Electrical distribution systems and components - Low-voltage switchgear, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement.

This edition cancels and replaces edition 1.1 (SABS 1765:2000).

Annexes A to E are for information only.



Contents Page

Abstract

Keywords

Foreword

1 Scope ... ............................................................................................................................................. 3

2 Normative references ... ..................................................................................................................... 3 3 Definitions ... ...................................................................................................................................... 4

4 Requirements ... ................................................................................................................................. 4 5 Routine tests ... .................................................................................................................................. 7

5.1 Inspection of the assembly... ................................................................................................... 7 5.2 Dielectric test ........................................................................................................................... 8 5.3 Routine Test Certificate ... ....................................................................................................... 9

Annex A (informative) Selection of components ... ....................................................................... 10

Annex B (informative) Notes to purchasers ... ............................................................................... 12

Annex C (informative) Explanation of IP ratings... ......................................................................... 14 Annex D (informative) Short-circuit withstand strength of assemblies ... ...................................... 15

Annex E (informative) Routine Test Certificate ... .......................................................................... 16 Bibliography... ..................................................................................................................................... 20

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SANS 1765:2003 Edition 2 This page is intentionally left blank

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Low-voltage switchgear and controlgear assemblies (distribution boards) with a rated short-circuit withstand strength up to and including 10 kA

1 Scope

1.1 This standard is applicable to low-voltage switchgear and controlgear assemblies that

a) have a rated short-circuit withstand strength up to and including 10 kA,

b) are stationary or movable,

c) have a rated voltage that does not exceed 1 000 V a.c. at frequencies not exceeding 50 Hz, or 1 500 V d.c.,

d) are intended for use in connection with the generation, transmission, distribution and conversion

of electric energy and for the control of electric energy consuming equipment, and

e) are designed for use under normal or special service conditions, for example in ships, in rail vehicles, for machine tools and for hoisting equipment, but excluding the use in explosive atmospheres where special requirements apply.

1.2 This standard is not applicable to individual devices and self-contained components, such as motor starters, fuse switches and electronic equipment, which have to comply with the relevant standards.

2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this standard. All standards are subject to revision and, since any reference to a standard is deemed to be a reference to the latest edition of that standard, parties to agreements based on this standard are encouraged to take steps to ensure the use of the most recent editions of the standards indicated below. Information on currently valid national and international standards can be obtained from Standards South Africa. IEC 60695-2-10, Fire hazard testing - Part 2-10: Glowing/hot-wire based test methods - Glow-wire apparatus and common test procedure.

3


SANS 1765:2003 Edition 2 SANS 60439-1/IEC 60439-1 (SABS IEC 60439-1), Low-voltage switchgear and controlgear assemblies - Part 1: Type-tested and partially type-tested assemblies.

SANS 60529/IEC 60529 (SABS IEC 60529), Degrees of protection provided by enclosures (IP

Code).

3 Definitions

For the purposes of this standard, the following definitions apply:

3.1

assembly distribution board

combination of one or more low-voltage switching devices together with associated control, measuring, signalling, protective and regulating equipment, etc., completely assembled under the responsibility of the manufacturer with all the internal electrical and mechanical interconnections and structural parts 3.2

series-connected (cascaded) system association between a switching device and a short-circuit protective device (SCPD) such that the switching device is protected under all conditions of short-circuit up to the interruption capacity rating of the SCPD

4 Requirements

4.1 Information regarding the assembly The following information shall be given on the nameplate:

a) the name of the manufacturer;

b) the project number or the identification number;

c) rated operational voltages (Ue);

d) the rated operational current (In);

e) the rated short-time withstand current (Icw);

f) the degree of protection (IPXX); and

g) the form of internal separation (main incoming and outgoing circuits). NOTE The manufacturer is deemed to be the organization taking responsibility for the completed assembly.

4



4.2 Electrical characteristics of assemblies

NOTE 1 Guidance to the manufacturer on the selection of suitable components is given in annex A.

NOTE 2 Information that should be supplied by the purchaser to enable the supplier to offer suitable equipment, is given in annex B.

4.2.1 The assembly shall be controlled by a switch-disconnector or a circuit-breaker that complies

with the isolating requirements specified for a disconnector.

4.2.2 Means shall be provided on all exposed surfaces to ensure electrical continuity of below 0,1

Ω. When electrical equipment is fitted to doors or hinged panels, such doors or panels shall be

separately earthed. Metal hinges are considered sufficient to ensure continuity.

4.2.3 In the absence of the minimum creepage distance being specified in the relevant product

standards for the components, the minimum creepage distance between phases and between

phases and earth shall be 16 mm.

4.2.4 In the absence of the minimum clearance distance being specified in the relevant product

standard, the minimum clearance distance between phases and between phases and earth shall be

8 mm.

4.2.5 The earth continuity conductor shall be of cross-sectional area at least 70 mm2, unless it can be shown that the current-carrying capacity of the earth continuity conductor from the earth bar to the enclosure is sufficient to withstand the earth fault current that can flow in the assembly.

4.2.6 The minimum cross-sectional area of the protective conductor shall be at least 50 % of the

cross-sectional area of the phase conductor.

4.2.7 The dielectric strength for power and control circuits shall be verified in accordance with 5.2.

4.3 Busbar systems

4.3.1 Unless an assembly has been fully tested in accordance with the relevant temperature-rise requirements of SANS 60439-1, the current density of a busbar shall not exceed 2 A/mm2 for currents ≤ 1 600 A, or 1,6 A/mm2 for currents > 1 600 A, the dimensions of the fish plates shall be similar to those of the busbar and the overlap on each side shall be at least equal to the width of the busbar.

4.3.2 The size and design of the busbar system shall be rated for the prospective short-circuit

current that could occur at the supply terminals of the assembly.

4.3.3 Standard colour coding, i.e. red, white (or yellow), blue, or the numbering L1, L2 and L3, shall be used to identify phase busbars. Green/yellow shall be used for the earthing conductor and black for the neutral busbar.

4.3.4 If colour is used for control wire coding, any colour may be used except green/yellow, green or

black.

4.3.5 The rated current (In) of a circuit shall be stated by the manufacturer, taking into

consideration the ratings of the components of the electrical equipment installed within the assembly, their disposition and application. Electrical equipment shall be selected in accordance with the manufacturer’s technical and installation instructions for enclosed assemblies.

5


SANS 1765:2003 Edition 2 4.3.6 In the case of a multiphase distribution board, the neutral busbar shall be at least 50 % of the cross-sectional area of the phase busbar provided that the particular application permits such a reduction.

4.4 Series-connected (cascaded) systems Switchgear shall be fully rated to withstand the prospective short-circuit current that could occur at the point of installation in the system, unless series-connected (cascaded) systems, which comply with the following, are used:

a) the combinations of circuit-breakers used shall comply with A.6.2(a) and A.6.4 of SANS 60947-2:2003 for co-ordinated back-up protection;

b) back-up circuit-breakers shall be fully rated to handle the maximum prospective short-circuit

current at the point of installation in the system; and

c) a warning label shall be fitted to every assembly where series-connected (cascaded) systems

are used. The label shall include the following wording:

WARNING This is a series-connected (cascaded) system. Except when recommended by the circuitbreaker manufacturer, do not replace any circuit-breaker (fuse-link) in the system with a circuit-breaker (fuse-link) that is not of identical type and rating.

4.5 Installation and maintenance instructions 4.5.1 The manufacturer shall specify in his documents or catalogues the conditions, if any, for the

installation, operation and maintenance of the assembly and the equipment contained therein.

4.5.2 If the circuitry is not obvious from the physical arrangement of the apparatus installed,

suitable information shall be supplied, for example wiring diagrams or tables.

4.6 Service conditions 4.6.1 The assembly shall be designed to withstand a pollution degree of 3 for a normal industrial

environment (see SANS 60439-1 for other degrees of pollution).

4.6.2 The assembly shall be so constructed that safe maintenance is ensured.

4.7 Design and construction

4.7.1 Where flammable material is used for construction of the enclosure, the switchgear and controlgear mounted in the enclosure shall be shrouded by non-flammable material.

4.7.2 The enclosure shall be suitable for use in the environmental conditions in which it is intended to

operate and it shall be protected against corrosion. The bottom cable entries of floor-mounted

assemblies shall be rodent proof.

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4.7.3 If a door or cover plate can be opened without the use of a tool, equipment behind the door or cover plate shall have a degree of protection with a rating of IP3X. The recommended minimum values for the degrees of protection in assemblies are

- for an indoor assembly : IP3X

- for an outdoor assembly : IP53

For other special applications, see SANS 60529. NOTE 1 An explanation of IP ratings is given in annex C.

NOTE 2 The degree of protection for cable access apertures should have a rating of IP2X or better.

4.7.4 The cover plate shall not be the sole means of keeping components in position. When in

position, an assembly shall not rely on the door or panel(s) to ensure rigidity.

4.7.5 The installation and connection of components shall be in accordance with the

manufacturer's instructions. Tightening of connections shall not alter the positions of components.

The tightness of components shall be checked and ensured.

4.7.6 Switchgear shall not be mounted in such a way that it can cause injury when operated. It shall be so positioned that conductors can be connected to the terminals.

NOTE In the case of an assembly that forms part of a fixed electrical installation, standards for relevant functional units and techniques are listed in clause 4 of SANS 10142-1:2003.

4.7.7 The flammability of the enclosure shall be tested in accordance with IEC 60695-2-10 at a

temperature of 650 °C ± 15 °C.

5 Routine tests 5.1 Inspection of the assembly

5.1.1 Check the effectiveness of mechanical actuating elements, interlocks, locks, etc.

5.1.2 Check conductors and cables for proper laying and the devices for proper mounting.

5.1.3 Visually inspect the assembly for compliance with the prescribed degrees of protection and

creepage and clearance distances.

5.1.4 Check, by random testing, the connections, especially the screwed connections, for adequate contact.

5.1.5 Verify that the information and markings are complete, and that the assembly corresponds

with the marking.

5.1.6 Check the assembly for conformance with the circuit and wiring diagrams, technical data,

etc., provided by the manufacturer.

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SANS 1765:2003 Edition 2 5.1.7 Depending on the complexity of the assembly, it might be necessary to inspect the wiring and to carry out an electrical functional test. The test procedure and the number of tests depend on whether or not the assembly includes complicated interlocks, sequence control facilities, etc.

NOTE In some cases, it might be necessary to repeat this test on site when the assembly is being installed. In

this case, a special agreement should be made between the manufacturer and the user.

5.2 Dielectric test 5.2.1 General All electrical equipment of the assembly shall be connected for the test, except for apparatus which, according to the relevant specifications, has been designed for a lower test voltage. Currentconsuming apparatus (e.g. windings, measuring instruments) in which the application of the test voltage would cause the flow of current, shall be disconnected. This apparatus shall be disconnected at one of its terminals unless it has not been designed to withstand the full test voltage, in which case all terminals may be disconnected. Anti-interference capacitors installed between live conductors and exposed conductive parts shall not be disconnected and shall be capable of withstanding the test voltage.

5.2.2 Application, duration and value of test voltage 5.2.2.1 Initially apply not more than 50 % of the value of the test voltage given in table 1.

5.2.2.2 Increase the voltage steadily within a few seconds to the full value and maintain for one

minute.

5.2.2.3 The a.c. source shall have sufficient power to maintain the test voltage irrespective of all

leakage currents.

5.2.2.4 The test voltage shall have a practically sinusoidal waveform and a frequency between

45 Hz and 62 Hz.

5.2.2.5 If the equipment included in the main or auxiliary circuits tested has previously been subjected to a dielectric strength test, reduce the test voltage to 85 % of the value indicated in table 1.

5.2.2.6 For the test,

- all switching devices shall be closed, or

- the test voltage shall be supplied successively to all parts of the circuit.

5.2.2.7 The test voltage shall be applied between the live parts and the frame of the assembly.

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Table 1 ― Test voltages

1

Rated insulation voltage Ui

V

Ui ≤ 60a

60 < Ui ≤ 300

300 < Ui ≤ 690

690 < Ui ≤ 800

800 < Ui ≤ 1 000

1 000 < Ui ≤ 1 500b

2

Dielectric test voltage a.c.

r.m.s. V

1 000

2 000

2 500

3 000

3 500

3 500

a Auxiliary circuits shall be tested at a minimum of 1 500 V. b For d.c. only.

5.2.3 Results to be obtained

An assembly shall be considered to have passed the test if no puncture or flashover is detected.

5.2.4 Checking of protective measures and of the electrical continuity of protective circuits

5.2.4.1 The protective measures with regard to protection against direct and indirect contact shall be

checked.

5.2.4.2 Screwed connections shall be checked for adequate contact by random tests.

5.3 Routine Test Certificate

The manufacturer shall provide a Routine Test Certificate (see annex E) with each assembly in which compliance with the requirements of this standard is declared.

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Annex A (informative)

Selection of components

A.1 General It is the responsibility of the manufacturer of the assembly to select components that are suitable for application. The manufacturer of the assembly should make use of any information available from component manufacturers, having regard, among other things, to the examples of factors given in A.2. In some cases, the suitability of an assembly for a particular application can only be determined by the tests as specified. The tests specified are designed to take account of the conditions that prevail in the assembly which might be more severe than those imposed by individual component standards for the same thermal or short-circuit current ratings. An individual component, such as a circuit-breaker or contactor, proven in accordance with its relevant standard for a thermal current or short-circuit current rating equal to that of the circuit in which it is installed, might be unable to achieve that rating, owing to conditions in the assembly. Where any of the factors described exist, it might be necessary to derate the components concerned or select components that have a higher rating.

A.2 Examples of factors to be considered A.2.1 Effect on rated thermal current A.2.1.1 Mounting of components

The thermal current rating of components can be affected by their orientation, for example upright or

sideways.

A.2.1.2 Enclosures

A different current rating for a component will apply when it is enclosed. This rating will be further influenced by the density of components in the space available and by heat-producing elements if present in adjacent components.

A.2.1.3 Connections The connections to components can influence their current rating, owing to heat input from busbars or other conductors that operate at higher temperatures than those of the conventional test conductors specified in the relevant standards.

A.2.2 Effect on rated short-circuit currents A.2.2.1 Mounting of components The short-circuit current ratings of components might be affected by their orientation, for example upright or sideways. Mounting bolts, clips or clamps can influence the ability of the component to withstand mechanical stresses imposed by fault current tests. Component manufacturers should be requested to state the required minimum clearances to earthed metal. (See also annex D.)

10



A.2.2.2 Enclosures The size and shape of the enclosure can influence the short-circuit current interrupting ability of a component. This is further influenced by the clearances and surface profiles presented to the component, especially those adjacent to any arc vents.

A.2.2.3 Connections

Owing to the effect of electromagnetic fields on the processes of interruption, connections can also influence the short-circuit current interrupting ability of components if their configurations are different from those used for the short-circuit current interrupting test in accordance with the relevant standards. In addition, the interrupting ability of a component can be affected where the length of the connections in the assembly is less than that of the test connections specified in the relevant standard for that component.

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Annex B (informative)

Notes to purchasers

B.1 General The information listed in this annex is necessary to enable suitable equipment to be offered in response to an enquiry. It is recognized that not all of this information will necessarily be available at the time of enquiry and, in certain special cases, information additional to that listed will be necessary at the time of placing the order, including any specific test requirements.

B.2 Concerning the individual circuits

B.2.1 The nature of supply voltage between lines, number of phases, number of wires, frequency,

fault level and the method of system earthing.

B.2.2 Control circuit voltage details.

B.2.3 Detailed information about external devices and the required discrimination levels, to allow

the manufacturers to select and adjust their components properly.

B.2.4 The size, type and duty rating of each circuit, with an appropriate line diagram.

B.2.5 Detailed descriptions of circuit interlocking requirements or a complete schematic diagram.

B.2.6 The required accuracy class of electrical indicating or recording instruments (for example

voltmeters, ammeters, kilowatt-hour meters).

B.2.7 The required accuracy class, ratio and burden of metering transformers or protection

current transformers (or both).

B.2.8 The required type of co-ordination of components with short-circuit protective devices, as

defined by SANS 60947-4-1 and appendix A of SANS 60947-2:1995.

B.2.9 Details regarding purchasers' cables or busbar trunking systems to be connected to

incoming and outgoing terminals in the assembly, such as

a) the cross-sectional area, diameter, shape and material of conductors, i.e. aluminium or copper,

b) the type and class of insulation, for example rubber, paper, plastics or mineral,

c) the number of cable cores and the method of entry, and

d) the entry position of a cable or busbar trunking system, for example top, side or bottom.

B.3 Concerning the assembly as a whole B.3.1 Any restrictions on external length (width), height or depth dimensions of the assembly.

B.3.2 Any restrictions relating to weight.

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B.3.3 The preferred method of connection of equipment, i.e. front or rear.

B.3.4 The preferred arrangement, if any, of the assembly, for example front access only; back-to-

back; layout of units; fixed, demountable or fully withdrawable units.

B.3.5 The short-circuit rating of busbars required.

B.3.6 Diversity factors of load circuits.

B.3.7 Details of any door interlocks or cover interlocks (or both), padlocks or other locking

devices, if required.

B.3.8 The type of earthing system that applies to the installation.

B.3.9 The degree of IP protection required.

B.3.10 The form of segregation required.

B.3.11 Information concerning spare units required, if any, and any future extensions, indicating

where extensions will be made.

B.3.12 Preferred labelling information for equipment mounted in the assembly.

B.4 Information relating to special service and installation conditions The manufacturer should be informed if

a) ambient temperatures are outside the range +40 °C to -5 °C for indoor installations or +40 °C to

-10 °C for outdoor installations,

b) the altitude exceeds 2 000 m,

c) the relative humidity exceeds 70 %, or the atmosphere contains an abnormal amount of dust, acids or corrosive gases, or if the assembly is to be installed near the sea, d) the assembly might be fitted to a moving device, if it is near earthed or live metal, if its support is capable of assuming a sloping position either permanently or temporarily (fitted aboard ships), or if the assembly will be exposed in service to abnormal shocks or vibrations, or

e) the assembly is to be installed in a hospital or other location where silence is a predominant

consideration.

13



Annex C (informative)

Explanation of IP ratings

Table C.1 is an extract from SANS 60529. For a full understanding of IP ratings, this table should be

read in conjunction with SANS 60529.

The IP ratings consist of the letters IP followed by two characteristic numerals. The first characteristic numeral relates to protection against the penetration of solid objects and the second characteristic numeral relates to protection against penetration of liquid. The use of X as a first or second characteristic numeral in the text of the standard indicates that there is no requirement for that characteristic numeral.

Table C.1 ― International protection ratings — IP codes

1 2 3

First characteristic numeral

Protection against solid Meaning for the

4 5 6

Second characteristic numeral

Protection against harmful Meaning for the foreign objects protection of persons

against access to IP Tests hazardous parts with:

0 No protection Non-protected

Full penetration of 50 mm diameter of

1 sphere not allowed. Back of hand Contact with hazardous parts not permitted.

Full penetration of 12,5 mm diameter of sphere not allowed. The

ingress of water protection

against water IP Tests

0 No protection Non-protected

Protected against 1 vertically falling drops of Vertical dripping

water

Protected against vertically falling drops of Dripping up to 15o from the

2 jointed test finger shall Finger 2 have adequate clearance from hazardous parts

The access probe of

water with enclosure vertical tilted 15o from the vertical

3 2,5 mm diameter shall Tool not penetrate

The access probe of

3 Proteoted against sprays to 60 from the vertical

Protected against water splashed from all

Limited spraying

4 1,0 mm diameter shall not penetrate

Limited ingress of dust 5 permitted (no harmful

deposit)

6 No ingress of dust

14

Wire

Dust- protected

Wire

Dust-tight

4

5

6

7

8

directions - limited ingress permitted

Protected against low- pressure jets of water from all directions - limited ingress permitted

Protected against strong jets of water, e.g. for use on ship decks - limited ingress permitted.

Protected against the effects of immersion between 150 mm and 1 m

Protected against long periods of immersion under pressure > 1 m

Splashing from all directions

Hosing jets from all directions

Strong hosing jets from all directions

Temporary immersion

Continuous immersion



Annex D (informative)

Short-circuit withstand strength of assemblies

D.1 The expected values of prospective short-circuit current for various ratings of transformer are

given in columns 5 and 6 of table D.1.

D.2 Several conditions can influence the actual short-circuit current caused by a fault condition. It is proposed that assemblies be designed for the short-circuit currents supplied by a single transformer as given in column 7.

Table D.1 ― Typical short-circuit currents

1 2

Transformer Percentage output nominal

impedance kVA Zn

200 315 4,5 400

3 4

Typical secondary current

A

Secondary voltage

400 V 525 V

290 220 455 345 575 440

5 6 7

Short-circuit current Design short-

kA circuit current

Secondary voltage

400 V 525 V kA

6,5 4,9 10 10,1 7,7 10 12,7 9,8 15

15



Annex E (informative)

Routine Test Certificate Routine Test Certificate

Low-voltage switchgear and controlgear assembly manufactured to SANS 1765

Name of client

Job No.

Test certificate No.

Rated operational voltage Ue

Rated current Ie

Rated insulation voltage Ui

Rated short-time current Icw

(1 s or 3 s)

Auxiliary circuit voltage

Type test report No.

PTTA assembly

1. Visual inspection

1.1 Markings

1.2 Conditions of use

1.3 Installation rules

1.4 Maintenance rules

1.5 Protective coating

1.6 Mechanical strength

16

V

A

V

kA s

V

Yes/No

Acceptance criteria

Able to identify individual circuits and devices

Confirmed as per client's instructions

Instructions included in documentation

Instructions included in documentation

Cleaned and coated to supplier's specifications

Ensure no undue deflection occurs during transport

Identification number

Date inspected

Form of separation Form:

Pollution degree No.:

Type of system earthing

IP rating IP:

Designed diversity 0, factor

Certification permit No. (if applicable)

EMC environment Yes/No

Results obtained Client's acceptance



Routine Test Certificate (continued)

1.7 Double insulation used in Cables touching the enclosure in this the fault free zone area to be double insulated

1.8 Electrical connectors Correct torque values applied and main fastened connectors marked accordingly

1.9 Available wiring space Shall permit proper reconnection

1.10 Neutral, protective and PE Provided in vicinity of the conductor conductor terminals terminals

1.11 Check that all documenta- Complete client's instructions/drawings tion is in project file Assembly design details

Parts list and component approvals

1.12 IP rating with outgoing Stated protective measures against cables and control wiring direct and indirect contact and IP rating installed to be verified

1.13 IP rating second digit Test report available to confirm type-test required requirements

1.14 Phase indication Phase indication is correctly identified

1.15 Nameplate details In accordance with the job specification

1.16 Site assembly materials Included as per job specification

1.17 Door/cover gaskets Ensure effective operation of gaskets

1.18 Main busbar extension Provision made for extension (Yes/No)

1.19 Bonding for earth continuity Metal hinges and/or metal screws used on doors and covers. Earth cable used alternatively or used for electrical components fitted on doors

1.20 Colour coding of cables Control wiring to be any colour except green/yellow, green or black

1.21 Components - Functional units to comply with clause 4 of SANS 10142-1:2003

- Ratings verified to applicable standard

1.22 Neutral/earth terminals Check for sufficient provision

1.23 Phase barriers Check for correct installation

1.24 Insulating material group Comparative tracking index (see IEC 60112)

17


SANS 1765:2003 Edition 2 Routine Test Certificate (continued)

1.25 Form of separation

1.26 Vermin proofing installed

1.27 Colour of indicator lamps, colour of switches and rotation

1.28 Non-metallic enclosures

2. Mechanical measurement

2.1 Clearances checked

2.2 Creepage distances

2.3 Support to component terminal fixing distance

2.4 Fixing distances of the main busbar supports

2.5 Fixing distances of the main riser busbar supports

2.6 Fixing distances of the distribution busbar supports

2.7 Fixing distances of the fault free zone busbar supports

2.8 Measure IP first digit with probe

2.9 IP value of form of separation

2.10 Installation of functional units

2.11 Effectiveness of functional units after installation

2.12 Neutral and PE conductor sizes

18

See annex D of SANS 60439-1:1999 (min. IP2X on partitions)

Confirmed as per client's instructions

See IEC 60073

Material passed the glow-wire test in IEC 60695-2-10 at 650 °C ± 15 °C.

Acceptance criteria

Measure phase/phase and phase/earth (min. of 8 mm)

Measure to table 16 and annex F of SANS 60439-1:1999 (min. of 16 mm)

Not to exceed maximum distance specified by supplier of components

To be in accordance with the design rules of the manufacturer




Obtain IP2X, IP3X, IP4X as 12,5 mm, 2,5 mm and 1 mm respectively

Obtain minimum of 12,5 mm with probe

Minimum height of terminals above floor level is 200 mm

Mechanical withdrawal trays, check actuators, interlocks, doors, correct mounting

See annex B, table B.1 of SANS 60439-1:1999 for conformance




Routine Test Certificate (concluded)

2.13 Current density (A/mm2)

3. Electrical measurement

3.1 Dielectric test - Main circuit

3.2 Dielectric test - Auxiliary circuit > 16 A

3.3 Insulation resistance

3.4 Circuit operation

3.5 Electromagnetic compatibility

- Main busbars (confirm design rules) - Distribution busbars

Acceptance criteria

See 8.3.2 of SANS 60439-1:1999

See 8.3.2 of SANS 60439-1:1999

1 MΩ min. (see 8.7.8 of SANS 10142-1:2003)

Operation of assembly in accordance with client's specification

Required when electronic functional units are installed


(manufacturer) declares herewith that the undersigned is duly authorized to perform the routine tests in accordance with the requirements of SANS 1765, and that the assembly complies with the requirements of SANS 1765.

Quality inspector Date For assemblies built or modified on site:

It is certified herewith that the above assembly complies with the requirements of SANS 1765.

Accredited person Registration number Date

19



Bibliography

IEC 60073, Basic and safety principles for man-machine interface, marking and identification -

Coding principles for indication devices and actuators. IEC 60112, Methods for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions.

IEC 61000-6-2, Electromagnetic compatibility (EMC) - Part 6-2: Generic standards - Immunity for

industrial environments. SANS 1473-1, Low-voltage switchgear and controlgear assemblies - Part 1: Type-tested, partially type-tested and specially tested assemblies with rated short-circuit withstand strength above 10 kA. SANS 10142-1 (SABS 0142-1), The wiring of premises - Part 1: Low-voltage installations.

SANS 60947-2/IEC 60947-2, Low-voltage switchgear and controlgear - Part 2: Circuit-breakers.

SANS 60947-4-1/IEC 60947-4-1 (SABS IEC 60947-4-1), Low-voltage switchgear and controlgear -

Part 4-1: Contactors and motor-starters - Electromechanical contactors and motor-starters. © Standards South Africa

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sans 1765-2003

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