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1 INTERNATIONAL STANDARD IEC Second edition Power cables with extruded insulation and their accessories for rated voltages from 1 kv (U m = 1,2 kv) up to 30 kv (U m = 36 kv) Part 1: Cables for rated voltages of 1 kv ((U m = 1,2 kv) and 3 kv (U m = 3,6 kv) This English-language version is derived from the original bilingual publication by leaving out all French-language pages. Missing page numbers correspond to the Frenchlanguage pages. Reference number IEC :2004(E)
2 INTERNATIONAL STANDARD IEC Second edition Power cables with extruded insulation and their accessories for rated voltages from 1 kv (U m = 1,2 kv) up to 30 kv (U m = 36 kv) Part 1: Cables for rated voltages of 1 kv ((U m = 1,2 kv) and 3 kv (U m = 3,6 kv) IEC 2004 Copyright - all rights reserved No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: Telefax: Web: Commission Electrotechnique Internationale International Electrotechnical Commission Международная Электротехническая Комиссия PRICE CODE For price, see current catalogue XA
3 IEC: CONTENTS FOREWORD Scope Normative references Terms and definitions Definitions of dimensional values (thicknesses, cross-sections, etc.) Definitions concerning the tests Voltage designations and materials Rated voltages Insulating compounds Sheathing compounds Conductors Insulation Material Insulation thickness Assembly of multicore cables, inner coverings and fillers Inner coverings and fillers Cables with rated voltage 0,6/1 (1,2) kv Cables with rated voltage 1,8/3 (3,6) kv Metallic layers for single-core and multicore cables Metallic screen Construction Requirements Concentric conductor Construction Requirements Application Lead sheath Metallic armour Types of metallic armour Materials Application of armour Dimensions of the armour wires and armour tapes Correlation between cable diameters and armour dimensions Round or flat wire armour Double tape armour Oversheath General Material Thickness Test conditions Ambient temperature Frequency and waveform of power frequency test voltages Waveform of impulse test voltages...45
4 IEC: Routine tests General Electrical resistance of conductors Voltage test Sample tests General Frequency of sample tests Repetition of tests Conductor examination Measurement of thickness of insulation and of non-metallic sheaths (including extruded separation sheaths, but excluding inner extruded coverings) Measurement of thickness of lead sheath Measurement of armour wires and tapes Measurement of external diameter Hot set test for EPR, HEPR and XLPE insulations and elastomeric sheaths Type tests, electrical Insulation resistance measurement at ambient temperature Insulation resistance measurement at maximum conductor temperature Voltage test for 4 h Impulse test for cables of rated voltage 1,8/3 (3,6) kv Type tests, non-electrical Measurement of thickness of insulation Measurement of thickness of non-metallic sheaths (including extruded separation sheaths, but excluding inner coverings) Tests for determining the mechanical properties of insulation before and after ageing Tests for determining the mechanical properties of non-metallic sheaths before and after ageing Additional ageing test on pieces of completed cables Loss of mass test on PVC sheaths of type ST Pressure test at high temperature on insulations and non-metallic sheaths Test on PVC insulation and sheaths and halogen free sheaths at low temperatures Test for resistance of PVC insulation and sheaths to cracking (heat shock test) Ozone resistance test for EPR and HEPR insulations Hot set test for EPR, HEPR and XLPE insulations and elastomeric sheaths Oil immersion test for elastomeric sheaths Water absorption test on insulation Fire tests Measurement of carbon black content of black PE oversheaths Shrinkage test for XLPE insulation Special bending test Determination of hardness of HEPR insulation Determination of the elastic modulus of HEPR insulation...71
5 IEC: Shrinkage test for PE oversheaths Additional mechanical tests on halogen free oversheaths Water absorption test for halogen free oversheaths Electrical tests after installation...73 Annex A (normative) Fictitious calculation method for determination of dimensions of protective coverings...95 A.1 General...95 A.2 Method...95 Annex B (normative) Rounding of numbers B.1 Rounding of numbers for the purpose of the fictitious calculation method B.2 Rounding of numbers for other purposes Annex C (normative) Determination of hardness of HEPR insulations C.1 Test piece C.2 Test procedure Figure C.1 Test on surfaces of large radius of curvature Figure C.2 Test on surfaces of small radius of curvature Table 1 Recommended rated voltages U Table 2 Insulating compounds...23 Table 3 Maximum conductor temperatures for different types of insulating compound...23 Table 4 Maximum conductor temperatures for different types of sheathing compound...25 Table 5 Nominal thickness of PVC/A insulation...27 Table 6 Nominal thickness of cross-linked polyethylene (XLPE) insulation...27 Table 7 Nominal thickness of ethylene propylene rubber (EPR) and hard ethylene propylene rubber (HEPR) insulation...29 Table 8 Thickness of extruded inner covering...31 Table 9 Nominal diameter of round armour wires...41 Table 10 Nominal thickness of armour tapes...41 Table 11 Routine test voltages...49 Table 12 Number of samples for sample tests...51 Table 13 Electrical type test requirements for insulating compounds...75 Table 14 Non-electrical type tests (see Tables 15 to 23)...77 Table 15 Test requirements for mechanical characteristics of insulating compounds (before and after ageing)...79 Table 16 Test requirements for particular characteristics for PVC insulating compound...81 Table 17 Test requirements for particular characteristics of various thermosetting insulating compounds...83 Table 18 Test requirements for mechanical characteristics of sheathing compounds (before and after ageing)...85
6 IEC: Table 19 Test requirements for particular characteristics for PVC sheathing compounds...87 Table 20 Test requirements for particular characteristics of thermoplastic PE sheathing compounds...89 Table 21 Test requirements for particular characteristics of halogen free sheathing compound...91 Table 22 Test requirements for particular characteristics of elastomeric sheathing compound...93 Table 23 Test methods and requirements for halogen free compounds...93 Table A.1 Fictitious diameter of conductor...48 Table A.2 Assembly coefficient k for laid-up cores...99 Table A.3 Increase of diameter for concentric conductors and metallic screens Table A.4 Increase of diameter for additional bedding
7 IEC: INTERNATIONAL ELECTROTECHNICAL COMMISSION POWER CABLES WITH EXTRUDED INSULATION AND THEIR ACCESSORIES FOR RATED VOLTAGES FROM 1 kv (U m = 1,2 kv) UP TO 30 kv (U m = 36 kv) Part 1: Cables for rated voltages of 1 kv (U m = 1,2 kv) and 3 kv (U m = 3,6 kv) FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as IEC Publication(s) ). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC has been prepared by IEC technical committee 20: Electric cables. This second edition cancels and replaces the first edition, published in 1997, its amendment 1 (1998) and constitutes a technical revision. The main changes with respect to the first edition relate to insulation and oversheath thickness requirements, and inclusion of constructions and requirements for halogen free cables with reduced flame propagation and low levels of smoke emission.
8 IEC: The text of this standard is based on the following documents: FDIS 20/683/FDIS Report on voting 20/691/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. IEC consists of the following parts, under the general title Power cables with extruded insulation and their accessories for rated voltages from 1 kv (U m = 1,2 kv) up to 30 kv (U m = 36 kv): Part 1: Part 2: Part 3: Part 4: Cables for rated voltages of 1 kv (U m = 1,2 kv) and 3 kv (U m = 3,6 kv); Cables for rated voltages from 6 kv (U m = 7,2 kv) up to 30 kv (U m = 36 kv); Reserved; Test requirements on accessories for cables with rated voltages from 6 kv (U m = 7,2 kv) up to 30 kv (U m = 36 kv). The committee has decided that the contents of this publication will remain unchanged until At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended.
9 IEC: POWER CABLES WITH EXTRUDED INSULATION AND THEIR ACCESSORIES FOR RATED VOLTAGES FROM 1 kv (U m = 1,2 kv) UP TO 30 kv (U m = 36 kv) Part 1: Cables for rated voltages of 1 kv (U m = 1,2 kv) and 3 kv (U m = 3,6 kv) 1 Scope This part of IEC specifies the construction, dimensions and test requirements of power cables with extruded solid insulation for rated voltages of 1 kv (U m = 1,2 kv) and 3 kv (U m = 3,6 kv) for fixed installations such as distribution networks or industrial installations. This standard includes cables which exhibit properties of reduced flame spread, low levels of smoke emission and halogen-free gas emission when exposed to fire. Cables for special installation and service conditions are not included, for example cables for overhead networks, the mining industry, nuclear power plants (in and around the containment area), submarine use or shipboard application. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60038:1983, IEC standard voltages IEC :1989, High-voltage test techniques Part 1: General definitions and test requirements IEC 60183:1984, Guide to the selection of high-voltage cables IEC 60228:1978, Conductors of insulated cables IEC 60230:1966, Impulse tests on cables and their accessories IEC :1993, Tests on electric cables under fire conditions Part 1: Test on a single vertical insulated wire or cable IEC :2000, Tests on electric cables under fire conditions Part 3-24: Test for vertical flame spread of vertically-mounted bunched wires or cables Category C IEC :1997, Power cables with extruded insulation and their accessories for rated voltages from 1 kv (U m = 1,2 kv) up to 30 kv (U m = 36 kv) Part 2: Cables for rated voltages from 6 kv (U m = 7,2 kv) up to 30 kv (U m = 36 kv)
10 IEC: IEC :1987, Flexible insulating sleeving Part 2: Methods of test IEC 60724:2000, Short-circuit temperature limits of electric cables with rated voltages of 1 kv (U m = 1,2 kv) and 3 kv (U m = 3,6 kv) IEC :1994, Test on gases evolved during combustion of materials from cables Part 1: Determination of the amount of halogen gas IEC :1991, Test on gases evolved during combustion of electric cables Part 2: Determination of degree of acidity of gases evolved during the combustion of materials taken from electric cables by measuring ph and conductivity IEC :1993, Common test methods for insulating and sheathing materials of electric cables Part 1: Methods for general application Section 1: Measurement of thickness and overall dimensions Tests for determining the mechanical properties IEC :1985, Common test methods for insulating and sheathing materials of electric cables Part 1: Methods for general application Section 2: Thermal ageing methods IEC :1993, Common test methods for insulating and sheathing materials of electric cables Part 1: Methods for general application Section 3: Methods for determining the density Water absorption tests Shrinkage test IEC :1985, Common test methods for insulating and sheathing materials of electric cables Part 1: Methods for general application Section 4: Tests at low temperature IEC :1998, Insulating and sheathing materials of electric and optical cables Common test methods Part 2-1: Methods specific to elastomeric compounds Ozone resistance, hot set and mineral oil immersion tests IEC :1985, Common test methods for insulating and sheathing materials of electric cables Part 3: Methods specific to PVC compounds Section 1: Pressure test at high temperature Tests for resistance to cracking IEC :1985, Common test methods for insulating and sheathing materials of electric cables Part 3: Methods specific to PVC compounds Section 2: Loss of mass test Thermal stability test IEC :1985, Common test methods for insulating and sheathing materials of electric cables Part 4: Methods specific to polyethylene and polypropylene compounds Section 1: Resistance to environmental stress cracking Wrapping test after thermal ageing in air Measurement of the melt flow index Carbon black and/or mineral content measurement in PE IEC : 1997, Measurement of smoke density of cables burning under defined conditions Part 2: Test procedure and requirements ISO 48:1994, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD)