IEC_62305-3_Ed_1_81-240.pdf

81/240/CDVCOMMITTEE DRAFT FOR VOTE(CDV)PROJET DE COMIT POUR VOTE(CDV)Project numberIEC 62305-3,Ed.1Numro de projetIEC/TC or SC:TC 81CEI/CE ou SC:Date of circulationDate de diffusion2004-01-09Closing date for voting(Votingmandatory for P-members)Date de clture du vote(Voteobligatoire pour les membres(P)2004-06-11Titre du CE/SC:Protection contre la foudreTC/SC Title:Lightning protectionSecretary:Dr.Ing.G.B.Lo Piparo(Italy)Secrtaire:E-mail:lopiparorai.itAlso of interest to the following committeesIntresse galement les comits suivantsSC 37A,TC 64,TC 77Supersedes documentsRemplace les documents81/214/CD 81/223A/CCFunctions concernedFonctions concernesSafetyScuritEMCCEMEnvironmentEnvironnementQuality assuranceAssurance qualitCE DOCUMENT EST TOUJOURS LTUDE ET SUSCEPTIBLE DEMODIFICATION.IL NE PEUT SERVIR DE RFRENCE.LES RCIPIENDAIRES DU PRSENT DOCUMENT SONT INVITS PRSENTER,AVEC LEURS OBSERVATIONS,LA NOTIFICATION DESDROITS DE PROPRIT DONT ILS AURAIENT VENTUELLEMENTCONNAISSANCE ET FOURNIR UNE DOCUMENTATION EXPLICATIVE.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.Titre:CEI 62305-3,Ed.1:Protection contre lafoudre-Partie 3:Dommages physiques sur lesstructures et risques humainsTitle:IEC 62305-3,Ed.1:Protection againstlightning-Part 3:Physical damage to structuresand life hazardNote dintroductionIntroductory noteThis document has been prepared based on the decisions taken at the last TC 81 meeting,(see81/236/RM item 7).According to these decisions National Committees are asked(see 81/239/DC)foropinion on the following editorial proposal:1.to delete in IEC 62305-3 the Annex B(informative):Lightning current flowing through externalconductive parts and installations entering the structure(see doc.81/240/CDV)2.to delete in IEC 62305-4 the Annex E(informative):Surges due to lightning at different installationpoint(see doc.81/238/CDV)3.to add to IEC 62305-1 a new Annex E(informative)incorporating the Annex B of IEC 62305-3 andthe Annex E of IEC 62305-4.The proposed new Annex E of IEC 62305-1 is attached.ATTENTIONCDV soumis en parallle au vote(CEI)et lenqute(CENELEC)ATTENTIONParallel IEC CDV/CENELEC EnquiryFORM CDV(IEC)2002-08-09Copyright 2004 International Electrotechnical Commission,IEC.All rights reserved.It ispermitted to download this electronic file,to make a copy and to print out the content for the solepurpose of preparing National Committee positions.You may not copy or mirror the file orprinted version of the document,or any part of it,for any other purpose without permission inwriting from IEC.62305-3 Ed.1/CDV IEC 2 CONTENTSPageFOREWORD.3INTRODUCTION.4Clause1Scope.52Normative references.53Terms and definitions.64Lightning Protection System(LPS).94.1Type of LPS.94.2Design of the LPS.9 4.3 Continuity of steelwork in reinforced concrete structure 105External lightning protection system.105.1General.105.2Air-termination systems.115.3Down-conductor systems.135.4Earth-termination system.155.5Fixing and connections.185.6Materials and dimensions.176Internal lightning protection system.176.1General.176.2Lightning equipotential bonding.186.3Electrical insulation of the external LPS.207 Maintenance and inspection of an LPS.217.1Scope of inspections.217.2Order of inspections.217.3Maintenance.218Protection measures against injuries of living beings due to touch and stepvoltages8.1 Protection measures against touch voltages8.2 Protection measures against step voltagesAnnex A(normative)Positioning of airtermination system.33A.1Positioning of the airtermination system when utilizing the protective anglemethod.32A.2Positioning of the air-termination system utilizing the rolling sphere method.32A.3Positioning of the airtermination system utilizing the mesh method.32Annex B(informative)Lightning current flowing through external conductive parts andinstallations connected to the structure.39Annex C(normative)Minimum cross section of the screen for self-protection of acable.41Annex D(informative)Partitioning of the lightning current amongst down-conductors.42Annex E(informative)Additional information for LPS in the case of structures with riskof explosion.46Annex F(informative)Guideline for design,installation,maintenance and inspection oflightning protection systems.4762305-3 Ed.1/CDV IEC 3 INTERNATIONAL ELECTROTECHNICAL COMMISSIONIEC 62305 PROTECTION AGAINST LIGHTNINGIEC 62305-3 Part 3:PHYSICAL DAMAGE TO STRUCTURES AND LIFEHAZARDFOREWORD1)The IEC(International Electrotechnical Commission)is a worldwide organization for standardization comprisingall national electrotechnical committees(IEC National Committees).The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields.Tothis end and in addition to other activities,the IEC publ