IEC_62305_3_2010_10_1.pdf

IEC 62305-3 Edition 2.0 2010-12 INTERNATIONAL STANDARD Protection against lightning Part 3:Physical damage to structures and life hazard IEC 62305-3:2010(E)colourinside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2010 IEC,Geneva,Switzerland All rights reserved.Unless otherwise specified,no part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical,including photocopying and microfilm,without permission in writing from either IEC or IECs member National Committee in the country of the requester.If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information.IEC Central Office 3,rue de Varemb CH-1211 Geneva 20 Switzerland Email:inmailiec.ch Web:www.iec.ch About the IEC The International Electrotechnical Commission(IEC)is the leading global organization that prepares and publishes International Standards for all electrical,electronic and related technologies.About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition,a corrigenda or an amendment might have been published.Catalogue of IEC publications:www.iec.ch/searchpub The IEC on-line Catalogue enables you to search by a variety of criteria(reference number,text,technical committee,).It also gives information on projects,withdrawn and replaced publications.IEC Just Published:www.iec.ch/online_news/justpub Stay up to date on all new IEC publications.Just Published details twice a month all new publications released.Available on-line and also by email.Electropedia:www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French,with equivalent terms in additional languages.Also known as the International Electrotechnical Vocabulary online.Customer Service Centre:www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance,please visit the Customer Service Centre FAQ or contact us:Email:csciec.ch Tel.:+41 22 919 02 11 Fax:+41 22 919 03 00 IEC 62305-3 Edition 2.0 2010-12 INTERNATIONAL STANDARD Protection against lightning Part 3:Physical damage to structures and life hazard INTERNATIONAL ELECTROTECHNICAL COMMISSION XG ICS 29.020;91.120.40 PRICE CODEISBN 978-2-88912-282-0 Registered trademark of the International Electrotechnical Commission colourinside 2 62305-3 IEC:2010(E)CONTENTS FOREWORD.7 INTRODUCTION.10 1 Scope.11 2 Normative references.11 3 Terms and definitions.12 4 Lightning protection system(LPS).15 4.1 Class of LPS.15 4.2 Design of the LPS.16 4.3 Continuity of steelwork in reinforced concrete structures.16 5 External lightning protection system.17 5.1 General.17 5.1.1 Application of an external LPS.17 5.1.2 Choice of external LPS.17 5.1.3 Use of natural components.17 5.2 Air-termination systems.18 5.2.1 General.18 5.2.2 Positioning.18 5.2.3 Air-terminations against flashes to the side of tall structures.19 5.2.4 Construction.20 5.2.5 Natural components.20 5.3 Down-conductor systems.21 5.3.1 General.21 5.3.2 Positioning for an isolated LPS.22 5.3.3 Positioning for a non-isolated LPS.22 5.3.4 Construction.23 5.3.5 Natural components.23 5.3.6 Test joints.24 5.4 Earth-termination system.24 5.4.1 General.24 5.4.2 Earthing arrangement in general conditions.25 5.4.3 Installation of earth electrodes.26 5.4.4 Natural earth electrodes.27 5.5 Components.27 5.5.1 General.27 5.5.2 Fixing.28 5.5.3 Connections.28 5.6 Materials and dimensions.29 5.6.1 Materials.29 5.6.2 Dimensions.29 6 Internal lightning protection system.31 6.1 General.31 6.2 Lightning equipotential bonding.32 6.2.1 General.32 6.2.2 Lightning equipotential bonding for metal installations.32 6.2.3 Lightning equipotential bonding for external conductive parts.33 6.2.4 Lightning equipotential bonding for internal systems.34 62305-3 IEC:2010(E)3 6.2.5 Lightning equipotential bonding for lines connected to the structure to be protected.34 6.3 Electrical insulation of the external LPS.35 6.3.1 General.35 6.3.2 Simplified approach.36 6.3.3 Detailed approach.36 7 Maintenance and inspection of an LPS.37 7.1 General.37 7.2 Application of inspections.37 7.3 Order of inspections.37 7.4 Maintenance.37 8 Protection measures against injury to living beings due to touch and step voltages.37 8.1 Protection measures against touch voltages.37 8.2 Protection measures against step voltages.38 Annex A(normative)Positioning the air-termination system.39 Annex B(normative)Minimum cross-section of the entering cable screen in order to avoid dangerous sparking.45 Annex C(informative)Evaluation of the separation distance s.46 Annex D(normative)Additional information for LPS in the case of structures with a risk of explosion.52 Annex E(informative)Guidelines for the design,con