BS-EN-62305-2-2006.pdf
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1、BRITISH STANDARD BS EN 62305-2:2006 Protection against lightning Part 2: Risk management ICS 29.020; 91.120.40 ? ? ? ? ? ? ? ? ? ? ? Incorporating Corrigendum April 2009 Licensed CopyChinese University of Hong Kong, 13/06/2009 07:40, Uncontrolled Copy, (c) BSI BS EN 62305-2:2006 This British Standar
2、d was published under the authority of the Standards Policy and Strategy Committee on 29 September 2006 BSI 2009 ISBN National foreword This British Standard is the UK implementation of EN 62305-2:2006. It is identical with IEC 62305-2:2006. This standard, together with BS EN 62305-1:2006, BS EN 623
3、05-3:2006 and BS EN 62305-4:2006, supersedes BS 6651:1999, . The UK participation in its preparation was entrusted to Technical Committee GEL/81, Protection against lightning. A list of organizations represented on GEL/81 can be obtained on request to its secretary. This publication does not purport
4、 to include all the necessary provisions of a contract. Users are responsible for its correct application. The values assigned for certain parameters used as part of the risk evaluation process in this British standard, are merely values proposed by the IEC (specifically in Annexes B, C and the case
5、 studies in Annex H). It is recognized by IEC that these identified values may not be appropriate for application in all the countries that utilize this standard. Different values may be assigned by each national committee based upon each countrys perception and importance they attribute to the rele
6、vant risk category. The UK committee (GEL/81) has reviewed the relevant parts of this standard and have provided appropriate UK interpretations which can be found in national annexes at the end of this standard. Annexes D and E are relevant to a service (service in this instance being part of teleco
7、mmunications, power, water, gas and fuel distribution networks). This information was to be used in conjunction with IEC 62305-5 services. IEC TC81 decided not to publish part 5 therefore Annexes D and E do not form an integral part of BS EN 62305-2. National Annex NK contains interpretations relati
8、ng to Table 7 and reproduces the lightning flash density map for the British Isles together with the table and map showing the thunderstorm days throughout the world from BS 6651:1999. Annexes B, C and H have been reproduced as National Annexes NB, NC and NH. The revised versions contain appropriate
9、 UK interpretations. These national annexes should be used wherever and whenever the British Standard is adopted for designing Lightning Protection systems in the UK. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication Date
10、Comments is withdrawn 978 0 580 66206 5 A software package, to complement IEC 62305-2:2006, and identified as the Simplified IEC Risk Assessment Calculator (SIRAC) has been produced by IEC and was endorsed by CENELEC in October 2007. Users should be aware that SIRAC has limited functionality and app
11、lication. It is intended to help users of the standard to appreciate the princips of the risk-assessment calculations. SIRAC is, for example, unable to correctly perform the necessary calculations when using the UK National Parameters given in Annexes NB, NC and NH of BS EN 62305-2:2006 and therefor
12、e it is not recommended for such system design purposes in the UK. 3 20090 April Text added to the National orewordf. le Licensed CopyChinese University of Hong Kong, 13/06/2009 07:40, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN 62305-2 NORME EUROPENNE EUROPISCHE NORM February 2006 CENELEC Europ
13、ean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for
14、 CENELEC members. Ref. No. EN 62305-2:2006 E ICS 29.020; 91.120.40 English version Protection against lightning Part 2: Risk management (IEC 62305-2:2006) Protection contre la foudre Partie 2: Evaluation du risque (CEI 62305-2:2006) Blitzschutz Teil 2: Risiko-Management (IEC 62305-2:2006) This Europ
15、ean Standard was approved by CENELEC on 2006-02-01. 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
16、 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 made by translation under the responsibility of a CENELEC member
17、 into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, It
18、aly, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Rumania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Licensed CopyChinese University of Hong Kong, 13/06/2009 07:40, Uncontrolled Copy, (c) BSI Foreword The text of document 81/263/FDIS,
19、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
20、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
21、 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 w
22、ithout any modification. _ EN 62305-2:2006 2 Licensed CopyChinese University of Hong Kong, 13/06/2009 07:40, Uncontrolled Copy, (c) BSI 3 EN 62305-2:2006 CONTENTS INTRODUCTION.8 1Scope 10 2Normative references .10 3Terms, definitions, symbols and abbreviations.10 4Explanation of terms.20 4.1Damage a
23、nd loss.20 4.2Risk and risk components 22 4.3Composition of risk components related to a structure24 4.4Composition of risk components related to a service 26 4.5Factors influencing the risk components.27 5Risk management.28 5.1Basic procedure 28 5.2Structure to be considered for risk assessment 28
24、5.3Service to be considered for risk assessment.28 5.4Tolerable risk RT29 5.5Specific procedure to evaluate the need of protection.29 5.6Procedure to evaluate the cost effectiveness of protection30 5.7Protection measures32 5.8Selection of protection measures .32 6Assessment of risk components for a
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