IEC_62305-3_214_CD.pdf

81/214/CDCOMMITTEE DRAFT(CD)IEC/TC or SC:TC 81Project numberIEC 62305-3,Ed.1Title of TC/SC:Lightning protectionDate of circulation2003-03-14Closing date for comments2003-06-20Also of interest to the following committeesSC 37A,TC 64,TC 77Supersedes documents81/205/CD 81/211/CCFunctions concerned:Safety EMC Environment Quality assuranceSecretary:Mr.G.B.Lo Piparo(Italy)E-mail:lopiparorai.itTHIS DOCUMENT IS STILL UNDER STUDY AND SUBJECT TOCHANGE.IT SHOULD NOT BE USED FOR REFERENCE PURPOSES.RECIPIENTS OF THIS DOCUMENT ARE INVITED TO SUBMIT,WITHTHEIR COMMENTS,NOTIFICATION OF ANY RELEVANT PATENTRIGHTS OF WHICH THEY ARE AWARE AND TO PROVIDESUPPORTING DOCUMENTATION.Title:IEC 62305-3,Ed.1:Protection against lightning-Part 3:Physical damage to structures and lifehazard(Titre):Introductory noteThis draft was prepared by TC 81/WG 8 in close cooperation with the TC 81 Secretary.Coherence of this draft with:IEC 62305-1(Editing stage,CDV to be circulated by 2003-06);IEC 62305-2(CD to be circulated by 2003-03);IEC 62305-4(CD to be circulated by 2003-03);has been checked and assured,as far as possible,by the Secretariat.Because the delay in preparation of Annex F,this Annex was not considered by WG 8;a preliminaryagreement was achieved between the WG 8 Convenor and the TC 81 Secretary.Quality of this Annex should be improved i.e.by adding figures.Such improvement can be done at CCstage according the received comments.FORM CD(IEC)2002-08-08Copyright 2003 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.2 81/214/CDCONTENTSPageFOREWORD.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.175.6Materials 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 step voltages.228.1 Protection measures against touch voltages.228.2 Protection measures against step voltages.22Annex A(normative)Positioning of airtermination system.31A.1Positioning of the airtermination system when utilizing the protective angle method.31A.2Positioning of the air-termination system utilizing the rolling sphere method.31A.3Positioning of the airtermination system utilizing the mesh method.31Annex B(informative)Lightning current flowing through external conductive parts andinstallations entering the structure.37Annex C(normative)Minimum cross section of the screen for self-protection of a cable.39Annex D(informative)Partitioning of the lightning current amongst down-conductors.40Annex E(informative)Additional information for LPS in the case of structures with danger ofexplosion.44Annex F(informative)Guideline for design,installation,maintenance and inspection oflightning protection systems.45 3 81/214/CDINTERNATIONAL ELECTROTECHNICAL COMMISSIONPROTECTION AGAINST LIGHTNING-Part 3:Physical damage to structures and life hazardFOREWORD1)The IEC(International Electrotechnical Commission)is a worldwide organization for standardization comprising allnational electrotechnical committees(IEC National Committees).The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields.To this end and in addition toother activities,the IEC publishes International Standards.Their preparation is entrusted to technical committees;anyIEC National Committee interested in the subject dealt with may participate in this preparatory work.International,governmental and non-governmental organizations liasing with the IEC also participate in this preparation.The IECcollaborates closely with the International Organization for Standardization(ISO)in accordance with conditionsdetermined by agreement between the two organizations.2)The formal decisions or agreements of the IEC on technical matters express,as nearly as possible,an internationalconsensus of opinion on the relevant subjects since each technical committee has representation from all interestedNational Committees.3)The documents produced have the form of recommendations for international use and are published in the form ofstandards,technical specifications,technical reports or guides and they are accepted by the National Committees in thats