IEC_60364-4-42_64_1346_CD.pdf

64/1346/CDCOMMITTEE DRAFT(CD)IEC/TC or SC:TC 64Project numberIEC 60364-4-42,Ed.3Title of TC/SC:Electrical installations and protection againstelectrical shockDate of circulation2003-10-24Closing date for comments2004-01-30Also of interest to the following committees Supersedes document64/1288/MCRFunctions concerned:Safety EMC Environment Quality assuranceSecretary:Mr.R.Pelta(Germany)E-mail:THIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TO CHANGE.ITSHOULD NOT BE USED FOR REFERENCE PURPOSES.RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT,WITH THEIRCOMMENTS,NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OFWHICH THEY ARE AWARE AND TO PROVIDE SUPPORTINGDOCUMENTATION.Title:IEC 60364-4-42,Ed.3:Electrical installations of buildings-Part 4-42:Protection for safety-Protectionagainst thermal effects(Titre):Introductory noteFORM CD(IEC)2002-05-14Copyright 2003 International Electrotechnical Commission,IEC.All rights reserved.It is permitted todownload this electronic file,to make a copy and to print out the content for the sole purpose of preparingNational Committee positions.You may not copy or mirror the file or printed version of the document,orany part of it,for any other purpose without permission in writing from IEC.XXX IEC:200X 2 64/1346/CDELECTRICAL INSTALLATIONS OF BUILDINGS Part 4-42:Protection for safety Protection against thermal effects420.1(421)1 ScopePersons,fixed equipment,and fixed materials adjacent to electrical equipment shall be protected againstharmful effects of heat developed by electrical equipment,or thermal radiation,particularly the followingeffects:combustion or degradation of materials;risk of burns;impairment of the safe function of installed equipment.NOTE Protection against overcurrent is dealt with in IEC 60364-4-43.420.2 Normative referencesThe following normative documents contain provisions which,through reference in this text,constituteprovisions of this part of IEC 60364.For dated references,subsequent amendments to,or revisions of,anyof these publications do not apply.However,parties to agreements based on this part of IEC 60364 areencouraged to investigate the possibility of applying the most recent editions of the normative documentsindicated below.For undated references,the latest edition of the normative document referred to applies.Members of IEC and ISO maintain registers of currently valid International Standards.IEC 60079-14:1996,Electrical apparatus for explosive gas atmospheres Part 14:Electrical installations inhazardous areas(other than mines)IEC 60332-1:1993,Tests on electric cables under fire conditions Part 1:Tests on a single vertical insulatedwire or cableIEC 60332-3-10:2000,Tests on electric cables under fire conditions Part 3-10:Test for vertical flamespread of vertically-mounted bunched wires or cables ApparatusIEC 60332-3-21:2000,Tests on electric cables under fire conditions Part 3-21:Test for vertical flamespread of vertically-mounted bunched wires or cables Category A F/RIEC 60332-3-22:2000,Tests on electric cables under fire conditions Part 3-22:Test for vertical flamespread of vertically-mounted bunched wires or cables Category AIEC 60332-3-23:2000,Tests on electric cables under fire conditions Part 3-23:Test for vertical flamespread of vertically-mounted bunched wires or cables Category BIEC 60332-3-24:2000,Tests on electric cables under fire conditions Part 3-24:Test for vertical flamespread of vertically-mounted bunched wires or cables Category C_1 In this standard,references in brackets refer to the previous numbering system.XXX IEC:200X 3 64/1346/CDIEC 60332-3-25:2000,Tests on electric cables under fire conditions Part 3-25:Test for vertical flamespread of vertically-mounted bunched wires or cables Category DIEC 60364-4-41:Electrical installations of buildings Part 4-41:Protection for safety Protection againstelectric shockIEC 60364-4-43:Electrical installations of buildings Part 4-43:Protection for safety Protection againstovercurrentIEC 60364-5-51:Electrical installations of buildings Part 5-51:Selection and erection of electricalequipment Common rulesIEC 60614(all parts),Conduits for electrical installations421(422)Protection against fireNOTE-Fire terms and related tests are under consideration by co-operation between ISO and IEC.The terms used in thisclause are provisional.421.1(422.1)Electrical equipment shall not present a fire hazard to adjacent materialsAny relevant manufacturers erection instructions shall be observed in addition to the requirements of IEC60364.421.2(422.2)Where fixed equipment may attain surface temperatures which could cause a fire hazard toadjacent materials,the equipment shall either:be mounted on or within materials which will withstand such temperatures and are of low thermalconductance,or be screened from elements of building construction by materials which will withstand such temperaturesand are of low thermal conductance,or be mounted to allow safe dissipation of heat at a sufficient distance from any material on whi