IEC_62305-2_241CDV.pdf

81/241/CDVCOMMITTEE DRAFT FOR VOTE(CDV)PROJET DE COMIT POUR VOTE(CDV)Project numberIEC 62305-2,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 documents81/213/CD 81/222A/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 62305-2,Ed.1:Protection contre lafoudre-Partie 2:Evaluation du risqueTitle:IEC 62305-2,Ed.1:Protection againstlightning-Part 2:Risk managementNote dintroductionIntroductory noteThere will be no French version of the CDV.This document has been prepared based on the decisions taken at the last TC 81 meeting,(see81/236/RM item 8).The simplified software for risk management(see Annex J)will be allocated in an IEC FTP serverassigned for TC 81 use and will be downloadable by National Committees.Risk assessmentperformed with the help of this software will be fully in line with procedure and requirements of IEC62305-2.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.62305-2 Ed.1/CDV IEC 2 ContentsFOREWORD4INTRODUCTION51.Scope and object62.Normative references63.Terms and definitions64.Explanation of terms104.1 Damages and loss10 4.1.1 Source of damage10 4.1.2 Types of damage104.1.3 Types of loss114.2 Risk and risk components124.2.1 Risk124.2.2 Risk components for a structure due to flashes to the structure134.2.3 Risk component for a structure due to a flash near the structure134.2.4 Risk components for a structure due to flashes to a service13connected to the structure4.2.5 Risk component for a structure due to a flash near a service13connected to the structure4.2.6 Risk components for a service due to flashes to the service144.2.7 Risk component for a service due to a flash near the service144.2.8 Risk components for a service due to flashes to the structure14to which the service is connected4.3 Compositions of risk components related to the structure144.3.1 Composition of risk components with reference to the source15of damage(Table 7)4.3.2 Composition of risk components with reference to the type of15damage(Table 7)4.4 Compositions of risk components related to the services164.4.1 Composition of risk components with reference to the source16 of damage(Table 9)4.4.2 Composition of risk components with reference to the type of17damage(Table 9)4.5 Factors influencing the risk components174.5.1 Factors influencing the risk components in a structure174.5.2 Factors influencing the risk components in a service1862305-2 Ed.1/CDV IEC 3 5.Risk management185.1 Basic procedure185.2 Structure to be considered for risk assessment195.3 Service to be considered for risk assessment195.4 Tolerable risk RT195.5 Procedure to evaluate the need of protection195.6 Procedure to evaluate the economic convenience of protection215.7 Protection measures22 5.8 Selection of protection measures226.Assessment of risk components for structures246.1 Basic equation24 6.2 Assessment of the risk components due to flashes to the structure256.3 Assessment of the risk component due to flash near the structure256.4 Assessment of risk components due to flashes to incoming line256.5 Assessment of risk component due to flash near an incoming line256.6 Summary of risk components in a structure276.7 Partitioning of a structure in zones ZS277.Assessment of risk components for services287.1 Basic equation287.2 Assessment of risk components due to flashes to the service287.3 Assessment of risk component due to flashes near the service287.4 Assessment of risk components due to flashes to the structure to28 which the service i