IEC 60364-4-42-2010 Low-voltage electrical installations - Part 4-42 Protection for safety - Protection against thermal effects《低压电气设备.第4-42部分 安全防护.热效应防护》.pdf

1、 IEC 60364-4-42Edition 3.0 2010-05INTERNATIONAL STANDARD NORME INTERNATIONALELow-voltage electrical installations Part 4-42: Protection for safety Protection against thermal effects Installations lectriques basse tension Partie 4-42: Protection pour assurer la scurit Protection contre les effets the

2、rmiques IEC60364-4-42:2010 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2010 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and micr

3、ofilm, without permission in writing from either IEC or IECs member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local IEC member Na

4、tional Committee for further information. Droits de reproduction rservs. Sauf indication contraire, aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie et les microfilms, sans laccord

5、 crit de la CEI ou du Comit national de la CEI du pays du demandeur. Si vous avez des questions sur le copyright de la CEI ou si vous dsirez obtenir des droits supplmentaires sur cette publication, utilisez les coordonnes ci-aprs ou contactez le Comit national de la CEI de votre pays de rsidence. IE

6、C Central Office 3, rue de Varemb CH-1211 Geneva 20 Switzerland Email: inmailiec.ch Web: www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related tech

7、nologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. Catalogue of IEC publications: www.iec.ch/searchpub The IEC on-line Catalogu

8、e enables you to search by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, withdrawn and replaced publications. IEC Just Published: www.iec.ch/online_news/justpub Stay up to date on all new IEC publications. Just Published details twice a

9、month all new publications released. Available on-line and also by email. Electropedia: www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French, with equivalent terms in additional languages.

10、 Also known as the International Electrotechnical Vocabulary online. Customer Service Centre: www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service Centre FAQ or contact us: Email: csciec.ch Tel.: +41 22 91

11、9 02 11 Fax: +41 22 919 03 00 A propos de la CEI La Commission Electrotechnique Internationale (CEI) est la premire organisation mondiale qui labore et publie des normes internationales pour tout ce qui a trait llectricit, llectronique et aux technologies apparentes. A propos des publications CEI Le

12、 contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possdez ldition la plus rcente, un corrigendum ou amendement peut avoir t publi. Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm Le Catalogue en-ligne de la CEI vous permet def

13、fectuer des recherches en utilisant diffrents critres (numro de rfrence, texte, comit dtudes,). Il donne aussi des informations sur les projets et les publications retires ou remplaces. Just Published CEI: www.iec.ch/online_news/justpub Restez inform sur les nouvelles publications de la CEI. Just Pu

14、blished dtaille deux fois par mois les nouvelles publications parues. Disponible en-ligne et aussi par email. Electropedia: www.electropedia.org Le premier dictionnaire en ligne au monde de termes lectroniques et lectriques. Il contient plus de 20 000 termes et dfinitions en anglais et en franais, a

15、insi que les termes quivalents dans les langues additionnelles. Egalement appel Vocabulaire Electrotechnique International en ligne. Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions, vis

16、itez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60364-4-42Edition 3.0 2010-05INTERNATIONAL STANDARD NORME INTERNATIONALELow-voltage electrical installations Part 4-42: Protection for safety Protection against thermal effects Installa

17、tions lectriques basse tension Partie 4-42: Protection pour assurer la scurit Protection contre les effets thermiques INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE SICS 29.120.50; 91.140.50 PRICE CODECODE PRIXISBN 978-2-88910-942-5 Registered trademark of the I

18、nternational Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60364-4-42 IEC:2010 CONTENTS FOREWORD.3 420.1 Scope .5 420.2 Normative references 5 420.3 Terms and definitions5 421 Protection against fire caused by electrical equipment 6 421.1 General require

19、ments 6 422 Precautions where particular risks of fire exist.8 422.1 General .8 422.2 Conditions of evacuation in an emergency.8 422.3 Locations with risks of fire due to the nature of processed or stored materials .9 422.4 Locations with combustible constructional materials 11 422.5 Fire propagatin

20、g structures12 422.6 Selection and erection of installations in locations with endangering of irreplaceable goods .12 423 Protection against burns .13 424 Protection against overheating 13 424.1 Forced air heating systems13 424.2 Appliances producing hot water or steam 13 424.3 Space heating applian

21、ces14 Annex A (informative) List of notes concerning certain countries15 Bibliography19 Table 42.1 Temperature limits in normal service for accessible parts of equipment within arms reach.13 60364-4-42 IEC:2010 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LOW-VOLTAGE ELECTRICAL INSTALLATIONS Part 4

22、-42: Protection for safety Protection against thermal effects 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 c

23、o-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

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

25、s 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 internationa

26、l 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 ef

27、forts 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 Publica

28、tions 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 itself does not provide any attestation of conformity. In

29、dependent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) N

30、o 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

31、 (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 applicat

32、ion 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 60364-4-42 has been prepared by IEC tec

33、hnical committee 64: Electrical installations and protection against electric shock. This third edition cancels and replaces the second edition, published in 2001, and constitutes a technical revision. The main changes with respect to the previous edition are listed below: The scope now includes pro

34、tection against all thermal effects and flames in case of a fire hazard being propagated from electrical installations to other fire compartments segregated by barriers which are in the vicinity. Requirements associated with escape routes for evacuation in an emergency have been expanded/modified. R

35、equirements associated with the nature of processed or stored materials have been expanded/modified. 4 60364-4-42 IEC:2010 Requirements associated with combustible constructional materials have been expanded/modified. Requirements associated with fire propagating structures have been modified slight

36、ly. New requirements for the selection and erection of installations in locations which might endanger precious goods have been added. Protection against overheating now includes space heating appliances. The text of this standard is based on the following documents: FDIS Report on voting 64/1725/FD

37、IS 64/1729/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. The readers attention is drawn to the fact that Annex A lists all of

38、 the “in-some-country“ clauses on differing practices of a less permanent nature relating to the subject of this standard. A list of all parts in the IEC 60364 series, under the general title Low-voltage electrical installations, can be found on the IEC website. Future standards in this series will

39、carry the new general title as cited above. Titles of existing standards in this series will be updated at the time of the next edition. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.

40、iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 60364-4-42 IEC:2010 5 LOW-VOLTAGE ELECTRICAL INSTALLATIONS Part 4-42: Protection for safety Protection against thermal effects 420.1 Scope

41、 This part of IEC 60364 applies to electrical installations with regard to measures for the protection of persons, livestock and property against thermal effects, combustion or degradation of materials, and risk of burns caused by electrical equipment, flames in case of a fire hazard being propagate

42、d from electrical installations to other fire compartments segregated by barriers which are in the vicinity, and the impairment of the safe functioning of electrical equipment including safety services. NOTE 1 For protection against thermal effects, national statutory requirements may be applicable.

43、 NOTE 2 Protection against overcurrent is dealt with in IEC 60364-4-43. 420.2 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 refere

44、nced document (including any amendments) applies. IEC 60332 (all parts), Tests on electric and optical fibre cables under fire conditions IEC 60364-4-41:2005, Low-voltage electrical installations Part 4-41: Protection for safety Protection against electric shock IEC 60364-5-51:2005, Electrical insta

45、llations of buildings Part 5-51: Selection and erection of electrical equipment Common rules IEC 61084 (all parts), Cable trunking and ducting systems for electrical installations IEC 61386 (all parts), Conduit systems for cable management IEC 61534 (all parts), Power track systems IEC 61537, Cable

46、management Cable tray systems and cable ladder systems IEC 60598-2-24, Luminaires Part 2-24: Particular requirements Luminaires with limited surface temperatures 420.3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 6 60364-4-42 IEC:2010 420.3.1 co

47、mbustible capable of burning 420.3.2 fire a process of combustion characterized by the emission of heat and effluent accompanied by smoke, and/or flame and/or glowing rapid combustion spreading uncontrolled in time and space 420.3.3 flammability ability of a material or product to burn with a flame

48、under specified test conditions 420.3.4 ignitability measure of the ease with which a specimen can be ignited due to the influence of an external source, under specified test conditions 420.3.5 ignition initiation of combustion NOTE For more information see IEC 60695-4. 420.3.6 non-flame propagating

49、 component component which is liable to ignite, as a result of an applied flame, but in which the flame does not propagate and which extinguishes itself within a limited time after the flame is removed IEC 60050-442:1998, 442-01-12 421 Protection against fire caused by electrical equipment 421.1 General requirements Persons, livestock and property shall be protected against d