IEC_62305-4_238_CDV_2.pdf

81/238/CDVCOMMITTEE DRAFT FOR VOTE(CDV)PROJET DE COMIT POUR VOTE(CDV)Project numberIEC 62305-4,Ed.1Numro de projetIEC/TC or SC:TC 81CEI/CE ou SC:Date of circulationDate de diffusion2003-12-19Closing date for voting(Votingmandatory for P-members)Date de clture du vote(Voteobligatoire pour les membres(P)2004-05-21Titre 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 documents81/212/CD 81/221A/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 62305-4,Ed.1:Protection contre lafoudre-Partie 4:Systmes lectriques etlectroniques dans des structuresTitle:IEC 62305-4,Ed.1:Protection againstlightning-Part 4:Electrical and electronicsystems within structuresNote dintroductionIntroductory noteAccording to the decision taken at last TC 81 meeting(see 81/236/RM item 6),National Committees areasked(see 81/239/DC)for opinion 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/XXX/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 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.62305-4 Ed.1/CDV IEC 2 IEC 62305-4:Protection against lightning-Part 4:Electrical and electronic systems within structures62305-4 Ed.1/CDV IEC 3 CONTENTSFOREWORD.6INTRODUCTION.71Scope.92Normative references.93Definitions.104Design and installation of LEMP protection measures.124.1Basic LPM system.124.2Lightning protection zones(LPZ).124.3Basic protection measures in an LPM system.135Earthing and bonding.145.1Earth termination system.145.2Bonding network.155.3Bonding bars.155.4Bonding at the boundary of LPZ.165.5Material and dimensions of bonding components.166Magnetic shielding and line routing.176.1Spatial shielding.176.2Shielding of internal lines.176.3Routing of internal lines.176.4Shielding of external lines.176.5Material and dimensions of magnetic shields.177Surge protective device system(SPD system).188Management of an LPM system.188.1LPM system management plan.188.2Inspection of an LPM system.198.2.1Inspection procedure.198.2.2Documentation of the inspection.208.3Maintenance.20TABLES.21FIGURES.23Annex A(informative)Basics for evaluation of electromagnetic environment in a LPZ.35A.1 Harm to electrical and electronic systems from lightning.35A.1.1 Source of harm.35A.1.2 Victim of harm.35A.1.3 Coupling mechanisms between victim and source of harm.35A.2 Spatial shielding,line routing and line shielding.36A.2.1 General.36A.2.2 Grid-like spatial shields.36A.2.3 Line routing and line shielding.37A.3 Magnetic field inside LPZ.37A.3.1 Approximation for the magnetic field inside LPZ.3762305-4 Ed.1/CDV IEC 4 A.3.2 Theoretical evaluation of the magnetic field due to direct lightning strikes.41A.3.3 Experimental evaluation of the magnetic field due to direct lightning strikes.42A.4 Calculation of induced voltages and currents.42A.4.1 Situation inside LPZ 1 in case of direct lightning strikes.42A.4.2 Situation inside LPZ 1 in case of nearby lightning strikes.43A.4.3 Situation inside LPZ 2 and higher.45Annex B(informative)Implementation of LEMP protection measures in existing structures.59B.1 Checklist.59B.2 Integration of new electronic systems into existing structures.59B.2.1 Overview of possible protection measures.59B.2.2 Establishment of LPZ for electrical and electronic systems.60B.3 Upgrading of power supply and cable installation inside the structure.61B.4 Pro