Protection against lightning — Part 1: General principles

EN 62305-1:2011
en: Protection against lightning — Part 1: General principles
uk: 73

EUROPEAN STANDARD

NORME EUROPEENNE EUROPAISCHE NORM

ICS 29.020; 91.120.40
EN 62305-1
February 2011
Supersedes EN 62305-1:2006 + corr. Nov.2006

English version
Protection against lightning -Part 1: General principles
(IEC 62305-1:2010, modified)
Protection contre la foudre - Blitzschutz -
Partie 1: Principes generaux Teil 1: Allgemeine Grundsatze
(CEI 62305-1:2010, modifiee) (IEC 62305-1:2010, modifiziert)
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 Mamix 17, Foreword
The text of document 81/370/FDIS, future edition 2 of IEC 62305-1, prepared by IECTC81, Lightning protection, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62305-1 on 2011-01-13.
This European Standard supersedes EN 62305-1:2006 + corr. Nov.2006.
This EN 62305-1:2011 includes the following significant technical changes with respect to EN 62305-1:2006 + corr. Nov.2006:
1) It no longer covers protection of services connected to structures.
2) Isolated interfaces are introduced as protection measures to reduce failure of electric and electronic systems.
3) First negative impulse current is introduced as a new lightning parameter for calculation purposes.
4) Expected surge overcurrents due to lightning flashes have been more accurately specified for low voltage power systems and for telecommunication systems.
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 62305-1:2010 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:
[1] IEC 60664-1:2007 NOTE Harmonized as EN 60664-1:2007 (not modified) [2] IEC 61000-4-5 NOTE Harmonized as EN 61000-4-5. [7] IEC 61643-1 NOTE Harmonized as EN 61643-11. [8] IEC 61643-21 NOTE Harmonized as EN 61643-21.

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 Title EN/HD Year IEC 62305-2 2010 Protection against lightning - Part 2: Risk management EN 62305-2 2011 IEC 62305-3 2010 Protection against lightning -
Part 3: Physical damage to structures and life hazard EN 62305-3 2011 IEC 62305-4 2010 Protection against lightning - EN 62305-4 2011Part 4: Electrical and electronic systems within structures

Edition 2.0 2010-12
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IEC 62305-1
Edition 2.0 2010-12

INTERNATIONAL

STANDARD

Protection against lightning - Part 1: General principles

INTERNATIONAL

ELECTROTECHNICAL

COMMISSION

PRICE CODE XB

ICS 29.020; 91.120.40

ISBN 978-2-88912-280-6

CONTENTS

FOREWORD 5

INTRODUCTION 7

1 Scope 8
2 Normative references 8
3 Terms and definitions 8
4 Lightning current parameters 14
5 Damage due to lightning 14
5.1 Damage to a structure 14
5.1.1 Effects of lightning on a structure 14
5.1.2 Sources and types of damage to a structure 16
5.2 Types of loss 16
6 Need and economic justification for lightning protection 18
6.1 Need for lightning protection 18
6.2 Economic justification of lightning protection 19
7 Protection measures 19
7.1 General 19
7.2 Protection measures to reduce injury of living beings by electric shock 19
7.3 Protection measures to reduce physical damage 20
7.4 Protection measures to reduce failure of electrical and electronic systems 20
7.5 Protection measures selection 20
8 Basic criteria for protection of structures 21
8.1 General 21
8.2 Lightning protection levels (LPL) 21
8.3 Lightning protection zones (LPZ) 23
8.4 Protection of structures 25
8.4.1 Protection to reduce physical damage and life hazard 25
8.4.2 Protection to reduce the failure of internal systems 26
Annex A (informative) Parameters of lightning current 27
Annex В? (informative) Time functions of the lightning current for analysis purposes 38
Annex C (informative) Simulation of the lightning current for test purposes 44
Annex D (informative) Test parameters simulating the effects of lightning on LPS components 48
Annex E (informative) Surges due to lightning at different installation points 62
Bibliography 67
Figure 1 - Connection between the various parts of IEC 62305 7
Figure 2 - Types of loss and corresponding risks resulting from different types of damage 18
Figure 3 - LPZ defined by an LPS (IEC 62305-3) 24
Figure 4 - LPZ defined by an SPM (IEC 62305-4) 25
Figure A.1 - Definitions of impulse current parameters (typically ?2 < 2 ms) 27
Figure A.2 - Definitions of long duration stroke parameters (typically 2 ms <T|_q^q <1 s) 28
Figure Figure A.4 - Possible components of upward flashes (typical to exposed and/or higher structures) 29
Figure A.5 - Cumulative frequency distribution of lightning current parameters (lines through 95 % and 5 % value) 34
Figure B.1 - Shape of the current rise of the first positive impulse 39
Figure B.2 - Shape of the current tail of the first positive impulse 40
Figure B.3 - Shape of the current rise of the first negative impulse 40
Figure B.4 - Shape of the current tail of the first negative impulse 41
Figure B.5 - Shape of the current rise of the subsequent negative impulses 42
Figure B.6 - Shape of the current tail of the subsequent negative impulses 42
Figure B.7 - Amplitude density of the lightning current according to LPL I 43
Figure C.1 - Example test generator for the simulation of the specific energy of the first positive impulse and the charge of the long stroke 45
Figure C.2 - Definition of the current steepness in accordance with Table C.3 46
Figure C.3 - Example test generator for the simulation of the front steepness of the first positive impulse for large test items 47