AS NZS 2373-2003 Electric cables - Twisted pair for control and protection circuits.doc

AS NZS 2373-2003 Electric cables - Twisted pair for control and protection circuitsAS/NZS 2373:2003 ?Australian/New Zealand StandardElectric cablesTwisted pair for control and protection circuits AS/NZS 2373 AS/NZS 2373:2003 This Joint Australian/New Zealand Standard was prepared by Joint Technical Committee EL-003, Electric wires and cables. It was approved on behalf of the Council of Standards Australia on 2 September 2003 and on behalf of the Council of Standards New Zealand on 9 September 2003. It was published on 29 October 2003. The following are represented on Committee EL-003: Australasian Railway Association Australian Electrical and Electronic Manufacturers Association Australian Industry Group Canterbury Manufacturers Association, New Zealand Department of Defence (Australia) Department of Mineral Resources N.S.W. Electrical Contractors Association of New Zealand Electrical Regulatory Authorities Council Electricity Supply Association of Australia Institution of Engineers Australia Ministry of Economic Development (New Zealand) National Electrical and Communications Association Keeping Standards up-to-date Standards are living documents which reflect progress in science, technology and systems. To maintain their currency, all Standards are periodically reviewed, and new editions are published. Between editions, amendments may be issued. Standards may also be withdrawn. It is important that readers assure themselves they are using a current Standard, which should include any amendments which may have been published since the Standard was purchased. 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This Standard was issued in draft form for comment as DR 02567.AS/NZS 2373:2003 ?Australian/New Zealand StandardElectric cablesTwisted pair for control and protection circuits 睷眮抵晸眮捯?Originated as AS 2373.21982. Previous edition AS/NZS 2373.2:1995. Jointly revised and redesignated as AS/NZS 2373:2003. COPYRIGHT? Standards Australia/Standards New Zealand All rights are reserved. 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. Jointly published by Standards Australia International Ltd, GPO Box 5420, Sydney, NSW 2001 and Standards New Zealand, Private Bag 2439, Wellington 6020 ISBN 0 7337 5509 7 AS/NZS 2373:2003 2 PREFACE This Standard was prepared by the Joint Standards Australia/Standards New Zealand Committee EL-003, Electric Wires and CaEblecs ttroic s upersede AS/NZS 2373.2:1995, cables for control an,d P parrotT t2we:ci st itoend cpiaricru ci.tosntrol cablesThe objective of this Standard is to specify the construction, dimensions and tests for cables used for control, supervisory, protection and instrumentation circuits, with or without a support wire. This Standard differs from the 1995 edition as follows: (a) The specified range of conductor cross-sectional areas has been amended. (b) The application of collective insulation, moisture barrier sheath, metallic sheath, armour and insect-resistant barrier have been nominated as optional processes. (c) The preferred range of cables has been reduced. (d) The approximate overall diameters have been deleted. The terms normative and informative have been used in this Standard to define the application of the appendix to which they apply. A normative appendix is an integral part of a Standard, whereas an informative appendix is only for information and guidance. Statements expressed in mandatory terms in notes to tables are deemed to be requirements of this 睷Stand眮ard. 抵晸眮捯? 3 AS/NZS 2373:2003CONTENTS Page 1 SCOPE.4. . 2 REFERENCED DOCUMENTS.4 3 DEFINITIONS.4 4 VOLTAGE DESIGNATION.5 5 CONDUCTORS.5 6 INSULATION.5 7 LAY-UP.6. 8 FILLERS AND TAPES.6 9 COLLECTIVE INSULATION (OPTIONAL).7 10 METALLIC SCREEN.7 11 MOISTURE BARRIER SHEATH (OPTIONAL).7 12 METALLIC SHEATH (OPTIONAL).7 13 ARMOUR (OPTIONAL).8 14 NON-METALLIC SHEATH.8 15 睷INSE眮CT-R抵ESIS晸TAN眮T BA捯RRIE?R (OPTIONAL).8 16 SUPPORT WIRES.9 17 MARKING.10 18 TESTING.10 19 GUIDE TO BENDING RADIUS.10 APPENDICES A PURCHASING GUIDELINES.13 B TYPICAL LAY-UP FORMATIONS .14 C THE FICTITIOUS CALCULATION METHOD FOR THE DETERMINATION OF THE DIMENSIONS OF PROTECTIVE COVERINGS.15 D NON-METALLIC SHEATH THICKNESS OF PREFERRED RANGE OF CABLES.19 E SUPPORT WIRE SIZE AND APPROXIMATE LINEAR MASS FOR PREFERRED RANGE OF CABLES.20 F GUIDE TO BENDING RADIUS OF NON-AERIAL CABLES.21 G HIGH VOLTAGE TEST.22 AS/NZS 2373:2003 44 STANDARDS AUSTRALIA/STANDARDS NEW ZEALAND Australian/New Zealand Standard Electric cablesTwisted pair for control and protection circuits 1 SCOPE This Standard specifies requirements for screened polyethylene (PE) insulated twisted pair control cables for voltages up to and including 0.6/1 kV. A support wire is included for aerial cables. It applies to cables intended for use in control, supervisory, protection and instrumentation circuits and includes cables commonly referred to as pilot cables. Control cables complying with this Standard may be used between power stations, substations or in industrial applications. It does not apply to cables used solely for telecommunication purposes. NOTE: Purchasing guidelines are contained in Appendix A. 2 REFERENCED DOCUMENTS The following documents are referred to in this Standard: AS1222 Steel conductors and staysBare overhead 1222.1睷 Pa眮rt 1: 抵G晸alvan眮ized (捯SC/G?Z) 2706 Numerical valuesRounding and interpretation of limiting values AS/NZS 1125 Conductors in insulated electric cables and flexible cords 1660 Test methods for electric cables, cords and conductors 1660.1 Method 1: Conductors and metallic components 1660.2.1 Method 2.1: Insulation, extruded semi-conductive screens and non-metallic sheathsMethods for general application 1660.3 Method 3: Electrical tests 1660.5.6 Method 5.6: Fire testsTest for combustion propagation 3808 Insulating and sheathing materials for electric cables 5000 Electric cablesPolymeric insulated 5000.1 Part 1: For working voltages up to and including 0.6/1 kV 3 DEFINITIONS For the purpose of this Standard, definitions given in the referenced Standards and those below apply. 3.1 Control cable A cable used for control, measuring, protection and communication circuits. 3.2 Lay-up The assembling of cores. 3.3 Routine tests Tests made by the manufacturer on each manufactured length of cable to check that each length meets the specified requirements. COPYRIGHT 5 AS/NZS 2373:20033.4 Sample tests Tests made by the manufacturer on samples of completed cable, or components taken from a completed cable, to verify that the finished product meets the design specification. 3.5 Type tests Tests made before supplying on a general commercial basis a type of cable covered by this Standard to demonstrate satisfactory performance characteristics to meet the intended application. These tests are of such a nature that, after they have been made, they need not be repeated, unless changes are made in the cable materials or design which might change the performance characteristics. 3.6 Voltage designation For cables for a.c. systeUm as,n dt he Uex praretesdse vdo ilUnta/ Utg;h eoes r f oformr oocables for d.c. systemUs, the rated voltage owhere U is the r.m.s. power frequency voltage to earth of the supply system or d.c. ovoltage of the supply system for which the cable is designed; and U is the r.m.s. power frequency voltage between phases of the supply system for which the cable is designed. 3.7 Wavelength or length of lay The axial distance between successive crests of the waveform or turns of the helix formed by a co睷re of眮 a pai抵r or p晸airs o眮f twi捯sted ?pair cable. 4 VOLTAGE DESIGNATION The ratedU v/Uo rletacgoeg nized for the purpose of this Standard is 0.6/1 kV. o5 CONDUCTORS Conductors shall be of single wire plain annealed copper and shall comply with the relevant requirements of AS/NZS 1125 and the maximum d.c. resistance at 20C as given in Table 1. TABLE 1 MAXIMUM d.c. RESISTANCE AT 20C OF SOLID CIRCULAR CONDUCTORS Nominal crossN-soemctinonala ld iamMeatxeirm um d.c. area of conductofr wire resistance at 20C 2mmmm?/km0.64 0.90 28.3 1.01.1318.11.271.2714.31.5 1.38 12.1 6 INSULATION 6.1 Material The insulation material shall be PE complying with AS/NZS 3808. 6.2 Application The insulation shall be homogeneous and applied with a close fit, but shall not adhere to the conductor. COPYRIGHT AS/NZS 2373:2003 66 6.3 Thickness The average thickness of insulation, determined by the method specified in AS/NZS 1660.2.1, shall be no)t slepsesc itfhieadn itnh eT tahbiclek n2e assn d( tthe iminimum thickness at any point shall not fall below the specified thickness by more than 10 percent of the specified thickness plus 0.1 mm, i.e. minimum thickt?n 0es.1s0 = m (0m.9) 0 iTABLE 2 INSULATION THICKNESS Nominal cross-seIcntsiuolna tion thickness area of conductor (t)i2mmmm0.640.8 1.27 0.81.00.81.50.86.4 Identification of twisted pairs When the twisted pairs in the cable are identified by colours, the colour coding of the pairs shall progress in sequence from the centre of the cable as given in Table 3. Alternatively, each pair may contain a black and a white insulated core. One or both cores in each pair shall be numbered in a contrasting colour. The numbering of pairs shall progre睷ss in 眮seque抵nce f晸rom t眮he ce捯ntre o?f the cable. TABLE 3 COLOUR CODE FOR TWISTED-PAIR CABLES Insulation Centre or layers Pair 1 Pair 2 Pair 3 Pair 4 Pair 5 Pair 6 Last pair 1-pair Orange- centre white 2-pair Orange-V iolet- centre white black 3-pair Orange-R ed-grey Violet- centre white black 4-pair Orange-R ed-grey BVluieo-let- centre white brown black Layers OranRgeed- grey BRlued-grey Blu*e - Violet white brown brown black * Pair colours shall repeat from red-grey. 7 LAY-UP An adequate number of separate, identifiable lengths of lay of twisted pairs shall be used to minimize crosstalk. NOTE: Typical lay-up formations are shown in Appendix B. 8 FILLERS AND TAPES Fillers, binder and wrapping tapes shall be of suitable non-metallic materials compatible with the other materials of the cable with which they are in contact. Wrapping tape(s) shall be applied with a minimum of 10 percent overlap around the laid up core assembly. COPYRIGHT 7 AS/NZS 2373:20039 COLLECTIVE INSULATION (OPTIONAL) 9.1 Material The collective insulation shall be PE complying with AS/NZS 3808. 9.2 Application The collective insulation shall be applied over the taped laid-up pairs. 9.3 Thickness The average thickness of insulation, determined by the method specified in AS/NZS 1660.2.1, shall not be less than 1.5 mm and the minimum thickness at any point shall be not less than 1.30 mm. NOTE: This requirement is designed to allow cables to withstand a voltage (under fault conditions) of 15 kV a.c. r.m.s. between the screen and the cores. 10 METALLIC SCREEN 10.1 General The metallic screen shall be either a collective screen consisting of a tape or tapes applied helically over the collective insulation or a moisture barrier sheath (see Clause 11). 10.2 Collective screen application For a single tape a minimum overlap of 15 percent shall be provided. For more than one tape a gap may be used in each tape, provided the following tape is positioned centrally over th睷e gap眮 in th抵e und晸erlyi眮ng ta捯pe. 10.3 Collective screen material The screen material shall consist of c?opper, brass or aluminium tape having a minimum thickness of 0.070 mm or aluminium/polyester laminated tape having a minimum aluminium thickness of 0.023 mm. 10.4 Continuity conductor (drain wire) Where an aluminium or aluminium/polyester helical tape is incorporated in the cable, a tinned co