AS NZS 3191 PDF

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AS NZS SANS Materials o This Standard was published on 19 March To maintain their currency, all Standards are periodically reviewed, and new editions are published.

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This Standard was issued in draft form for comment as DR The Standard is downloaded from www. Seventh edition No part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.

The nominal cross-sectional areas of the conductors specified in this Standard are identical with the values recommended in IEC , Conductors of insulated cables. Where the equivalent cords exist in IEC Standards, the dimensions for insulation and sheath thicknesses have been adopted in this Standard.

The temperature ratings and hence properties of insulation and sheath materials for these dimensionally equivalent cords, however, are quite different.

Compliance with this Standard does not necessarily imply suitability for end use. End applications need to be considered to ensure appropriate cord selection. It is not intended, however, that other types or sizes of flexible cord should be precluded from use, and regulatory authorities will consider the issue of a Certificate of Suitability for connection to the supply mains under the non-declared scheme for other types and sizes as they are developed.

Any application for such certification should be accompanied by a description of the flexible cord. Appendix B will facilitate the selection of cords to this Standard, which should replace the designated IEC cords. It is right hand when the slope is in the direction of the central part of the letter Z, and left hand when the slope is in the direction of the central part of the letter S. These tests are of such a nature that after they have been made, they need not be repeated unless changes are made in the cord materials or design which might change the performance characteristics.

The duty rating is a guide to the physical suitability of the cords in various applications. In this Standard the construction clauses indicate the duty rating and voltage designation as indicated below.

The mass of the insulation shall be either green or yellow, the other colour may be part of the mass or at the surface only. Cores insulated with R-S or R-S which are intended to be used as earth conductors may be durably coloured green. For other than earth conductors and the unprotected parallel-webbed 2-core flat cords, the following colour scheme is recommended: a Active cores brown, black, white or grey, orange.

For other than earth conductors, the colouring for identification may be within the mass or at the surface of the core insulation. The core sequence of the laid-up cores should be in the order specified in Clause 2. The earth core, if any, shall always be last, following the active cores, and the neutral, if any.

The electrical resistance of the screen shall not be greater than that permitted for an active conductor of the completed cord. The number of spindles and wires per spindle shall be sufficient to ensure that the filling factor is not less than 0. Glass fibre braid shall be impregnated with a suitable varnish. The approximate thickness of any non-metallic braid in the case of glass fibre braided cords inclusive of the varnish coating , should be 0.

The distance between the end of one block of marking and the beginning of the next shall not exceed mm. TABLE 2. Notes 2 and 3. Not applicable to non- After all burning has ceased, the surface metallic braided cords or of the sample shall be wiped clean, and R-EP, R-S and R-S the charred or affected portion shall not insulated, unsheathed or GPS extend to within 50 mm of the lower edge sheathed cords of the clamp fitted at the top.

Fire, however, is a complex phenomenon and its behaviour, when associated with a cable run, is a function of the characteristics of the cable materials, the method of installation, and the environment in which it is used. Consequently, no single test can give a full assessment of the fire hazard under all possible fire conditions. There must be a constant awareness of these interrelated factors and effects of important variables in using this test to assess the fire hazard in any particular situation e.

Special installation precautions may have to be taken as it cannot be assumed that a bunch of cables will behave in the same way as a single cable. The compatibility test shall be carried out only for flexible cords constructed with materials from different material groups see Tables in Clause 2. NOTE: Suitable for installations only where further protected.

NOTE: These constructions are not considered to be flame retardant. Subsequently, the aluminium block shall be removed from the sample. These standards are developed through an open process of consultation and consensus, in which all interested parties are invited to participate.

The Standards Council of New Zealand is the national authority responsible for the production of Standards. The requirements or recommendations contained in published Standards are a consensus of the views of representative interests and also take account of comments received from other sources. They reflect the latest scientific and industry experience. International Involvement Standards Australia and Standards New Zealand are responsible for ensuring that the Australian and New Zealand viewpoints are considered in the formulation of international Standards and that the latest international experience is incorporated in national and Joint Standards.

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