IEC_En_62305-2_I_Ed__04-2006-Eng.pdf

3I Comitati Nazionali membri del CENELEC sono tenuti,in accordo col regolamento interno del CEN/CENELEC,ad adottare questa Norma Europea,senza alcuna modifica,come Norma Nazionale.Gli elenchi aggiornati e i relativi riferimenti di tali Norme Nazionali possono essere ottenuti rivolgendosi al Segretariato Centrale del CENELEC o agli uffici di qualsiasi Comitato Nazionale membro.La presente Norma Europea esiste in tre versioni ufficiali(inglese,francese,tedesco).Una traduzione effettuata da un altro Paese membro,sotto la sua responsabilit,nella sua lingua nazionale e notificata al CENELEC,ha la medesima validit.I membri del CENELEC sono i Comitati Elettrotecnici Nazionali dei seguenti Paesi:Austria,Belgio,Cipro,Danimarca,Estonia,Finlandia,Francia,Germania,Grecia,Irlanda,Islanda,Italia,Lettonia,Lituania,Lussemburgo,Malta,Norvegia,Olanda,Polonia,Portogallo,Regno Unito,Repubblica Ceca,Slovacchia,Slovenia,Spagna,Svezia,Svizzera e Ungheria.I diritti di riproduzione di questa Norma Europea sono riservati esclusivamente ai membri nazionali del CENELEC.CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a National Standard without any alteration.Up-to-date lists and bibliographical references concerning such National Standards may be obtained on application to the Central Secretariat or to any CENELEC member.This European Standard exists in three official versions(English,French,German).A version in any other language and notified to the CENELEC Central Secretariat has the same status as the official versions.CENELEC members are the national electrotechnical committees of:Austria,Belgium,Cipre,Czech Republic,Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuanian,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal,Slovakia,Slovenia,Spain,Sweden,Switzerland and United Kingdom.CENELEC Copyright reserved to all CENELEC members.C E N E L E CComitato Europeo di Normalizzazione Elettrotecnica Secrtariat Central Comit Europen deNormalisation Electrotechique European Committee for Electrotechnical Standardization Rue de Strassart 35,B 1050 Bruxelles EuropiKomitee fr Elektrotechnische Normung EN 62305-2Protezione contro i fulminiParte 2:Valutazione del rischio Protection against lightningPart 2:Risk management Protection contre la foudre Partie 2:Evaluation du risque Blitzschutz Teil 2:Risiko-Management NORMA TECNICA CEI EN 62305-2:2006-04 Pagina ivFOREWORD The text of document 81/263/FDIS,future edition 1 of IEC 62305-2,prepared by IEC TC 81,Lightning protection,was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62305-2 on 2006-02-01.The following dates were fixed:latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop)2006-11-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow)2009-02-01 This European Standard makes reference to International Standards.Where the International Standard referred to has been endorsed as a European Standard or a home-grown European Standard exists,this European Standard shall be applied instead.Pertinent information can be found on the CENELEC web site._ ENDORSEMENT NOTICE The text of the International Standard IEC 62305-2:2006 was approved by CENELEC as a European Standard without any modification.NORMA TECNICA CEI EN 62305-2:2006-04 Pagina viNORMA TECNICA CEI EN 62305-2:2006-04 Pagina viii CONTENTSINTRODUCTION.11Scope.52Normative references.53Terms,definitions,symbols and abbreviations.54Explanation of terms.214.1Damage and loss.214.2Risk and risk components.274.3Composition of risk components related to a structure.294.4Composition of risk components related to a service.334.5Factors influencing the risk components.355Risk management.375.1Basic procedure.375.2Structure to be considered for risk assessment.375.3Service to be considered for risk assessment.395.4Tolerable risk RT.395.5Specific procedure to evaluate the need of protection.395.6Procedure to evaluate the cost effectiveness of protection.415.7Protection measures.455.8Selection of protection measures.456Assessment of risk components for a structure.516.1Basic equation.516.2Assessment of risk components due to flashes to the structure(S1).516.3Assessment of the risk component due to flashes near the structure(S2).516.4Assessment of risk components due to flashes to a line connected to the structure(S3).536.5Assessment of risk component due to flashes near a line connected to the structure(S4).536.6Summary of risk components in a structure.576.7Partitioning of a structure in zones ZS.576.8Assessment of risk components in a structure with zones ZS.597Assessment of risk components for a service.617.1Basic equation.617.2Assessment of components due to flashes to the service(S3).617.3Assessment of risk component due to flashes near the service(