Protection against lightning — Part 4: Electrical and electronic systems within structures

EN 62305-4:2011
en: Protection against lightning — Part 4: Electrical and electronic systemswithin structures
uk:

EUROPEAN STANDARD

NORME EUROPEENNE EUROPAISCHE NORM

ICS 29.020; 91.120.40
EN 62305-4
February 2011
Supersedes EN 62305-4:2006 + corr. Nov.2006

English version
Protection against lightning -Part 4: Electrical and electronic systems within structures (IEC 62305-4:2010, modified)

This European Standard was approved by CENELEC on 2011-01-13. 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 made by translation under the responsibility of a CENELEC member 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, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

CENELEC

European Committee for Electrotechnical StandardizationComite Europeen de Normalisation ElectrotechniqueEuropaisches Komitee fur Elektrotechnische Normung
Management Centre: Avenue Marnix 17, Foreword
The text of document 81/373/FDIS, future edition 2 of IEC 62305-4, prepared by IECTC81, Lightning protection, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62305-4 on 2011-01-13.
This European Standard supersedes EN 62305-4:2006 + corr. Nov.2006.
This EN 62305-4:2011 includes the following significant technical changes with respect to EN 62305-4:2006 + corr. Nov.2006:
1) Isolating interfaces capable of reducing conducted surges on lines entering the structure are introduced.
2) Minimum cross-sections for bonding components are slightly modified.
3) First negative impulse current is introduced for calculation purposes as electromagnetic source of harm to the internal systems.
4) Selection of SPD with regard to voltage protection level is improved to take into account oscillation and induction phenomena in the circuit downstream of SPD.
5) Annex C dealing with SPD coordination is withdrawn and referred back to SC 37A.
6) A new informative Annex D is introduced giving information on factors to be considered in the selection of SPDs.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights.
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) 2011-10-13
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-01-13
Annex ZA has been added by CENELEC.
Endorsement notice
The text of the International Standard IEC 62305-4:2010 was approved by CENELEC as a European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
[2] IEC 61000 series NOTE Harmonized in EN 61000 series (partially modified).
[8] IEC 61643-11 NOTE Harmonized as EN 61643-11.

Annex ZA (normative)
Normative references to international publicationswith their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies.
Publication Year
IEC 60364-5-53 2001
IEC 60664-1 2007
IEC 61000-4-5 2005
IEC 61000-4-9 1993
IEC 61000-4-10 1993
IEC 61643-1 2005
IEC 61643-12 (mod) 2008
IEC 61643-21 -
IEC 61643-22 (mod) -
IEC 62305-1 2010
IEC 62305-2 2010
Title EN/HD Year Electrical installations of buildings - Part 5-53: Selection and erection of electrical equipment - Isolation, switching and control - - Insulation coordination for equipment within low-voltage systems -
Part 1: Principles, requirements and tests EN 60664-1 2007 Electromagnetic compatibility (EMC) - Part 4-5: Testing and measurement techniques - Surge immunity test EN 61000-4-5 2006 Electromagnetic compatibility (EMC) - Part 4-9: Testing and measurement techniques - Pulse magnetic field immunity test EN 61000-4-9 1993 Electromagnetic compatibility (EMC) - Part 4-10: Testing and measurement techniques - Damped oscillatory magnetic field immunity test EN 61000-4-10 1993 Low-voltage surge protective devices -
Part 1: Surge protective devices connected to low-voltage power distribution systems - Requirements and tests - Low-voltage surge protective devices - Part 12: Surge protective devices connected to low-voltage power distribution systems - Selection and application principles CLC/TS 61643-12 2009 Low voltage surge protective devices - Part 21: Surge protective devices connected to telecommunications and signalling networks - Performance requirements and 4 testing methods EN 61643-21 Low-voltage surge protective devices - CLC/TS 61643-22
Part 22: Surge protective devices connected to telecommunications and signalling
networks - Selection and application principles - Protection against lightning - Part 1: General principles EN 62305-1 2011 Protection against lightning - Part 2: Risk management EN 62305-2 2011

Publication Year
IEC 62305-3 2010 Title EN/HD Year
Protection against lightning - EN 62305-3 2011
Part 3: Physical damage to structures and life hazard

Edition 2.0 2010-12

INTERNATIONAL STANDARD

Protection against lightning -
Part 4: Electrical and electronic systems within structures

Copyright 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 lEC's 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 Varembe CH-1211 Geneva 20 Switzerland
Email: inmail@iec.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/iustoub
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.electroDedia .org
The world's 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: csc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
shapeType32lineWidth12700

shapeType32lineWidth12700

CONTENTS

FOREWORD 5

INTRODUCTION 7

1 Scope 9
2 Normative references 9
3 Terms and definitions 10
4 Design and installation of SPM 13
4.1 General 13
4.2 Design of SPM 16
4.3 Lightning protection zones (LPZ) 17
4.4 Basic SPM 20
5 Earthing and bonding 21
5.1 General 21
5.2 Earth-termination system 22
5.3 Bonding network 24
5.4 Bonding bars 28
5.5 Bonding at the boundary of an LPZ 29
5.6 Material and dimensions of bonding components 29
6 Magnetic shielding and line routing 30
6.1 Spatial shielding 30
6.2 Shielding of internal lines 30
6.3 Routing of internal lines 30
6.4 Shielding of external lines 31
6.5 Material and dimensions of magnetic shields 31
7 Coordinated SPD system 31
8 Isolating interfaces 32
9 SPM management 32
9.1 General 32
9.2 SPM management plan 32
9.3 Inspection of SPM 33
9.3.1 Inspection procedure 34
9.3.2 Inspection documentation 34
9.4 Maintenance 35
Annex A (informative) Basis of electromagnetic environment evaluation in an LPZ 36
Annex В? (informative) Implementation of SPM for an existing structure 60
Annex C (informative) Selection and installation of a coordinated SPD system 76
Annex D (informative) Factors to be considered in the selection of SPDs 82
Bibliography 87
Figure 1 - General principle for the division into different LPZ 13
Figure 2 - Examples of possible SPM (LEMP protection measures) 15
Figure 3 - Examples for interconnected LPZ 19
Figure 4 - Examples for extended lightning protection zones 20
F