As NZS 4296-1995 Cable Trunking Systems

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AS/NZS 4296:1995

Australian/New Zealand Standard

Cable trunking systems

AS/NZS 4296:1995 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee EL/4, Electrical Accessories. It was approved on behalf of the Council of Standards Australia on 11 May 1995 and on behalf of the Council of Standards New Zealand on 29 May 1995. It was published on 5 September 1995.

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The following interests are represented on Committee EL/4: Australian Chamber of Commerce and Industry Australian Electrical and Electronic Manufacturers Association Australian Regulatory Authorities (Electrical) Consumer Electronics Suppliers Association, Australia Electrical Supply Association of Australia Ministry of Commerce, New Zealand National Electrical Contractors Association of Australia New Zealand Electrical Contractors Federation New Zealand Manufacturers Federation Railways of Australia Committee The Association of Consulting Engineers, Australia The Plastics Industry Association, Australia

Review of Standards. To keep abreast of progress in industry, Joint Australian/New Zealand Standards are subject to periodic review and are kept up to date by the issue of amendments or new editions as necessary. It is important therefore that Standards users ensure that they are in possession of the latest edition, and any amendments thereto. Full details of all Joint Standards and related publications will be found in the Standards Australia and Standards New Zealand Catalogue of Publications; this information is supplemented each month by the magazines ‘The Australian Standard’ and ‘Standards New Zealand’, which subscribing members receive, and which give details of new publications, new editions and amendments, and of withdrawn Standards. Suggestions for improvements to Joint Standards, addressed to the head office of either Standards Australia or Standards New Zealand, are welcomed. Notification of any inaccuracy or ambiguity found in a Joint Australian/New Zealand Standard should be made without delay in order that the matter may be investigated and appropriate action taken.

This Standard was issued in draft form for comment as DR 94166.

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AS/NZS 4296:1995

Australian/New Zealand Standard Cable trunking systems

PUBLISHED JOINTLY BY: STANDARDS AUSTRALIA 1 The Crescent, Homebush NSW 2140 Australia STANDARDS NEW ZEALAND Level 10, Standards House, 155 The Terrace, Wellington 6001 New Zealand ISBN 0 7262 9839 5

AS / NZS 4296:1995

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PREFACE This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee EL/4 on Electrical Accessories. It is issued as a Joint Standard.

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The object of this Standard is to provide requirements for a system of enclosures consisting of lengths of trunking, with covers and appropriate fittings, intended for the installation and protection of cables. The following types of trunking are covered: (a)

Solid wall.

(b)

Open-slotted.

(c)

Closed-slotted.

Flammability, electrical and mechanical tests are specified to determine fitness for purpose, and certain tests applicable to UPVC conduit are included as they are considered also to be applicable to trunking. During the preparation of this Standard, reference was made to IEC 1084-1(1991), Cable trunking and ducting systems for electrical installations , Part 1: General requirements. However, as this Standard only applies to cable trunking, the format of IEC 1084-1 has not been followed. The term ‘normative’ has been used in this Standard to define the application of the appendix to which it applies. A ‘normative’ appendix is an integral part of a Standard.

 Copyright

STANDARDS AUSTRALIA/ STANDARDS NEW ZEALAND

Users of Standards are reminded that copyright subsists in all Standards Australia and Standards New Zealand publications and software. Except where the Copyright Act allows and except where provided for below no publications or software produced by Standards Australia or Standards New Zealand may be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing from Standards Australia or Standards New Zealand. Permission may be conditional on an appropriate royalty payment. Australian requests for permission and information on commercial software royalties should be directed to the head office of Standards Australia. New Zealand requests should be directed to Standards New Zealand. Up to 10 percent of the technical content pages of a Standard may be copied for use exclusively in-house by purchasers of the Standard without payment of a royalty or advice to Standards Australia or Standards New Zealand. Inclusion of copyright material in computer software programs is also permitted without royalty payment provided such programs are used exclusively in-house by the creators of the programs. Care should be taken to ensure that material used is from the current edition of the Standard and that it is updated whenever the Standard is amended or revised. The number and date of the Standard should therefore be clearly identified. The use of material in print form or in computer software programs to be used commercially, with or without payment, or in commercial contracts is subject to the payment of a royalty. This policy may be varied by Standards Australia or Standards New Zealand at any time.

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AS / NZS 4296:1995

CONTENTS

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Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 REFERENCED DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 GENERAL REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 GENERAL CONDITIONS FOR TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 CLASSIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 MARKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 CONSTRUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 MECHANICAL PROPERTIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 RESISTANCE TO FLAME PROPAGATION . . . . . . . . . . . . . . . . . . . . . . . . . . 9 ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 EXTERNAL INFLUENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 ACID-GAS EMISSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 INSTRUCTIONS TO BE PROVIDED BY THE MANUFACTURER . . . . . . . . . 10

APPENDICES A TEST OF SCREWS AND SCREW FIXINGS . . . . . . . . . . . . . . . . . . . . . . B TEST FOR ACCESS TO LIVE PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . C TEST OF THE INTRODUCTION OF CABLES INTO MEMBRANES AT LOW TEMPERATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D TEST OF CABLE SUPPORTING CAPACITY . . . . . . . . . . . . . . . . . . . . . E TEST OF IMPACT RESISTANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F TEST OF RESISTANCE TO LINEAR DEFLECTION . . . . . . . . . . . . . . . G TEST OF COVER RETENTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . H TEST OF RESISTANCE TO FLAME . . . . . . . . . . . . . . . . . . . . . . . . . . . I TEST OF ELECTRICAL INSULATING STRENGTH . . . . . . . . . . . . . . . . J TESTS OF LEVEL OF PROTECTION OF TRUNKING AND FITTINGS AGAINST CORROSIVE OR POLLUTING SUBSTANCES . . .

First publi shed as AS/NZS 4296:1995.

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13 14 17 19 20 21 23

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AS / NZS 4296:1995

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STANDARDS AUSTRALIA / STANDARDS NEW ZEALAND Australian/New Zealand Standard Cable trunking systems 1 SCOPE This Standard specifies requirements for cable trunking systems intended for the accommodation, protection and, if required, the segregation of cables in an electrical installation.

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This Standard does not apply to cable trays, cable ladders or to conduits (including closed non-circular sections). 2

REFERENCED DOCUMENTS The documents below are referred to in this Standard:

AS 1660 1660.5 1660.5.3

Test methods for electrical cables, cords and conductors Fire tests Determination of the amount of halogen acid gas evolved during the combustion of polymeric materials taken from cables

1939

Degrees of protection provided by enclosures for electrical equipment (IP code)

AS/NZS 2053

Conduits and fittings for electrical installations (all Parts)

3350

3

Approval and test specification— Safety of General requirements for household and similar electrical appliances Part 1: General requirements

DEFINITIONS For the purpose of this Standard, the following definitions apply.

3.1 Cable trunking system— a system of trunking lengths and components, used for the accommodation and protection of cables. 3.2 Composite components — a system component consisting of both conductive and insulating material. 3.3 External influence —the presence of oil, water, building materials, low or high temperatures, corrosive or polluting substances, solar radiation or mechanical stress. 3.4 Fitting — a system component used to connect, change direction or to terminate a trunking length. 3.5 Fixing device — a system component used to secure other system components to a supporting structure. 3.6 Floor access unit— a component used with an underfloor cable trunking system that provides access to cables. 3.7 Floor service unit —an apparatus mounting device used with an underfloor cable trunking system. 3.8 Halogen-free component — a component which produces a low level of acid gas emission during combustion. 3.9 Insulated components —a system component consisting only of insulating material and having no conductive parts. 3.10

Metal components — a system component consisting only of metal.

COPYRIGHT

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AS/NZS 4296:1995, Cable trunking systems

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