IEC_62305-1_Ed._1.0.pdf

FORM FDIS(IEC)/FORMULAIRE FDIS(CEI)2002-08-08 81/262/FDISFINAL DRAFT INTERNATIONAL STANDARDPROJET FINAL DE NORME INTERNATIONALEProject number Numro de projet IEC 62305-1 Ed.1.0 IEC/TC or SC CEI/CE ou SC 81 Secretariat/Secrtariat Italy Submitted for parallel voting in CENELEC Soumis au vote parallle au CENELEC Distributed on/Diffus le 2005-08-19 Voting terminates on/Vote clos le 2005-10-21 Also of interest to the following committees Intresse galement les comits suivants 37A,64,77 Supersedes document Remplace le document 81/216/CDV -81/237A/RVC Functions concerned Fonctions concernes Safety Scurit EMC CEM Environment Environnement Quality assurance Assurance de la qualit INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION LECTROTECHNIQUE INTERNATIONALE THIS DOCUMENT IS A DRAFT DISTRIBUTED FOR APPROVAL.IT MAY NOT BE REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL,TECHNOLOGICAL,COMMERCIAL AND USER PURPOSES,FINAL DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.CE DOCUMENT EST UN PROJET DIFFUS POUR APPROBATION.IL NE PEUT TRE CIT COMME NORME INTERNATIONALE AVANT SA PUBLICATION EN TANT QUE TELLE.OUTRE LE FAIT DTRE EXAMINS POUR TABLIR SILS SONT ACCEPTABLES DES FINS INDUSTRIELLES,TECHNOLOGIQUES ET COMMERCIALES,AINSI QUE DU POINT DE VUE DES UTILISATEURS,LES PROJETS FINAUX DE NORMES INTERNATIONALES DOIVENT PARFOIS TRE EXAMINS EN VUE DE LEUR POSSIBILIT DE DEVENIR DES NORMES POUVANT SERVIR DE RFRENCE DANS LES RGLEMENTATIONS NATIONALES.Title IEC 62305-1 Ed.1.0:Protection against lightning Part 1:General principles Titre CEI 62305-1 Ed.1.0:Protection contre la foudre Partie 1:Principes gnraux ATTENTION VOTE PARALLLE CEI CENELEC Lattention des Comits nationaux de la CEI,membres du CENELEC,est attire sur le fait que ce projet final de Norme internationale est soumis au vote parallle.Un bulletin de vote spar pour le vote CENELEC leur sera envoy par le Secrtariat Central du CENELEC.ATTENTION IEC CENELEC PARALLEL VOTING The attention of IEC National Committees,members of CENELEC,is drawn to the fact that this final Draft International Standard(DIS)is submitted for parallel voting.A separate form for CENELEC voting will be sent to them by the CENELEC Central Secretariat.Copyright 2005 International Electrotechnical Commission,IEC.All rights reserved.It is permitted to download this electronic file,to make a copy and to print out the content for the sole purpose of preparing National Committee positions.You may not copy or mirror the file or printed version of the document,or any part of it,for any other purpose without permission in writing from IEC.62305-1/FDIS IEC 2 CONTENTS FOREWORD.5 INTRODUCTION.7 1 Scope.8 2 Normative references.8 3 Terms and definitions.8 4 Lightning current parameters.14 5 Damage due to lightning.14 5.1 Damage to a structure.14 5.2 Damage to a service.17 5.3 Types of loss.18 6 Need and economic convenience for lightning protection.20 6.1 Need for lightning protection.20 6.2 Economic convenience of lightning protection.21 7 Protection measures.21 7.1 Protection measures to reduce injury of living beings due to touch and step voltages.21 7.2 Protection measures to reduce physical damage.21 7.3 Protection measures to reduce failure of electrical and electronic systems.22 7.4 Protection measures selection.22 8 Basic criteria for protection of structures and services.22 8.1 Lightning protection levels(LPL).23 8.2 Lightning protection zones(LPZ).27 8.3 Protection of structures.28 8.4 Protection of services.29 Annex A(informative)Parameters of lightning current.30 Annex B(informative)Time functions of the lightning current for analysis purposes.38 Annex C(informative)Simulation of the lightning current for test purposes.44 Annex D(informative)Test parameters simulating the effects of lightning on LPS components.48 Annex E(informative)Surges due to lightning at different installation points.63 Bibliography.68 62305-1/FDIS IEC 3 Figure 1 Types of loss resulting from different types of damage.20 Figure 2 LPZ defined by an LPS(IEC 62305-3).25 Figure 3 LPZ defined by protection measures against LEMP(IEC 62305-4).26 Figure A.1 Definitions of short stroke parameters(typically T2 2 ms).30 Figure A.2 Definitions of long stroke parameters (typically 2 ms Tlong RT In this case,protection measures shall be adopted in order reduce the risk R(R1 to R3)to the tolerable level RT R RT If more than one type of loss could appear in the object to be protected,the condition R RT shall be satisfied for each type of loss(L1,L2 and L3).62305-1/FDIS IEC 21 The values of tolerable risk RT where lightning could result in the loss of items of social value should be under the responsibility of a competent national body.NOTE 1 An authority having jurisdiction may specify the need for lightning protection for specific applications w