IEC 62440-2008 Electric cables with a rated voltage not exceeding 450 750 V - Guide to use《额定电压不超过450 750V的电缆.使用指南》.pdf

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1、 IEC 62440Edition 1.0 2008-02INTERNATIONAL STANDARD NORME INTERNATIONALEElectric cables with a rated voltage not exceeding 450/750 V Guide to use Cbles lectriques avec une tension assigne nexcdant pas 450/750 V Guide demploi IEC62440:2008THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Ge

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16、Fax: +41 22 919 03 00 IEC 62440Edition 1.0 2008-02INTERNATIONAL STANDARD NORME INTERNATIONALEElectric cables with a rated voltage not exceeding 450/750 V Guide to use Cbles lectriques avec une tension assigne nexcdant pas 450/750 V Guide demploi INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION E

17、LECTROTECHNIQUE INTERNATIONALE TICS 29.060.20 PRICE CODECODE PRIXISBN 2-8318-9570-7 2 62440 IEC:2008 CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references7 3 Terms and definitions .7 4 Safety.8 4.1 General .8 4.2 Selection and installation .8 4.3 Fixed cables 9 4.4 Flexible cables or c

18、ords .9 5 Limiting conditions 11 5.1 General .11 5.2 Voltage11 5.3 Current-carrying capacity.11 5.4 Thermal effects .12 5.5 Fire characteristics 13 5.6 Mechanical stress14 5.6.1 General .14 5.6.2 Tension .14 5.6.3 Bending .14 5.6.4 Compression .16 5.6.5 Twisting/torsion16 5.7 Compatibility17 5.8 Dyn

19、amic stresses (electromechanical stress).17 6 Initial and periodic verifications .17 7 Packaging, storage and handling/transportation 17 7.1 Packaging .17 7.2 Storage .18 7.2.1 Risk of moisture.18 7.2.2 Temperature conditions .18 7.3 Handling/transportation18 Annex A (informative) Classes of externa

20、l influence (environmental conditions) 19 Annex B (informative) Types of usage 21 Annex C (informative) Classes of duty22 Bibliography24 Figure 1 Definition of internal bending radius 15 62440 IEC:2008 3 Table 1 Spacing of supports for non-armoured cables in accessible positions .9 Table 2 Examples

21、of maximum permitted voltages against rated voltage of cable .11 Table 3 Minimum recommended bending radii at cable temperatures of (20 10) C 16 Table A.1 Classes of external influence (environmental conditions).19 4 62440 IEC:2008 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTRIC CABLES WITH A R

22、ATED VOLTAGE NOT EXCEEDING 450/750 V GUIDE TO USE 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

23、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

24、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 non-governmental organizations liaising with the IEC also participate in this preparatio

25、n. 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

26、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 ma

27、de 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 transp

28、arently 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

29、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

30、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 an

31、y 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 b

32、e the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62440 has been prepared by IEC technical committee 20: Electric cables. The text of this standard is based on the following documents: FDIS Report on voting 20/

33、919/FDIS 20/929/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. In some countries legislation may limit the use of certain cabl

34、e types, and may define additional requirements for cable installation practice. 62440 IEC:2008 5 The committee has decided that the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to

35、 the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 62440 IEC:2008 INTRODUCTION This International Standard provides guidance for equipment manufacturers, installers and end-users on the properties of low-voltage elect

36、ric cables, and the limitations that are deemed to be necessary in order to safeguard life, buildings and goods. The information is given in the form of limiting values and is illustrated by examples which are not exhaustive but which indicate ways in which safety can be obtained. Additional informa

37、tion on installation practice is given in the IEC 60364 series. 62440 IEC:2008 7 ELECTRIC CABLES WITH A RATED VOLTAGE NOT EXCEEDING 450/750 V GUIDE TO USE 1 Scope This International Standard provides general guidance for the safe use of electric cables with a rated voltage not exceeding 450/750 V. I

38、t is applicable to those cables that are specified in IEC 60227 and IEC 60245. The guidance given in this standard can also be applicable to low-voltage cables of a similar type to those specified in IEC 60227 and IEC 60245 but not specifically mentioned in those standards. In such cases, it is advi

39、sable to seek additional advice from the cable manufacturer. NOTE Whilst this International Standard, which offers guidelines to the user, is a voluntary standard, those who choose to use it, or who claim conformance to it, must follow the advice contained therein, e.g. with regard to certain bendin

40、g radii or certain clip spacings, etc. Notwithstanding this, national laws and regulations (especially those relating to selection and installation of cables via IEC 60364), will always take priority. 2 Normative references The following referenced documents are indispensable for the application of

41、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 60050-461, International Electrotechnical Vocabulary Part 461: Electric cables IEC 60245-6, Rubber insulated cables Rated

42、 voltages up to and including 450/750 V Part 6: Arc welding electrode cables IEC 60287(all parts), Electric cables Calculation of the current rating IEC 60335-1, Household and similar electrical appliances Safety Part 1: General requirements IEC 60364 (all parts), Low-voltage electrical installation

43、s IEC 60364-5-52, Electrical installations of buildings Part 5-52: Selection and erection of electrical equipment Wiring systems 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050-461 and in the IEC 60364 series, as well as the following, apply. 3

44、.1 internal wiring wiring mechanically protected by being enclosed within a casing of equipment or by other equivalent means 8 62440 IEC:2008 4 Safety 4.1 General Safety of a cable means that the product does not present an unacceptable risk of danger to life or property whilst being used in its int

45、ended manner. The duration of acceptable performance of a particular type of cable depends upon: the type of use, installation, or electrical apparatus, and on the particular combination of influences that the above might incur. For example, the duration of acceptable performance considered as reaso

46、nable for a cable used in a fixed installation for the distribution of electricity in a building is more than that for a flexible cord. Cables shall not be buried directly in the ground, and unless otherwise stated, shall not be used for any purpose other than the transmission and distribution of el

47、ectricity. The test methods and test parameters described in the IEC standards referred to in Clause 1 are only for the purposes of checking design with respect to safety and quality assurance. They do not necessarily indicate that the cables are suitable for service under conditions equivalent to t

48、he test conditions. 4.2 Selection and installation 4.2.1 All conductors and cables shall be selected so as to be suitable for the voltages and currents likely to occur, and under all conditions which are anticipated in the equipment or installations or for the part in which they are to be used. 4.2.

49、2 Cables shall be so constructed, installed, protected, used and maintained as to prevent danger so far as it is reasonably practicable. 4.2.3 Cables shall be selected so that they are suitable for the intended operating conditions and equipment classification. Examples of operation conditions include: a) voltage; b) current; c) protective measures; d) grouping of cables; e) method of install