EN 62305-1:2011

SLOVENSKI STANDARD
01-maj-2011
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Protection against lightning - Part 1: General principles
Blitzschutz - Teil 1: Allgemeine Grundsätze
Protection contre la foudre - Partie 1: Principes généraux
Ta slovenski standard je istoveten z: EN 62305-1:2011
ICS:
91.120.40 =DãþLWDSUHGVWUHOR Lightning protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62305-1
NORME EUROPÉENNE
February 2011
EUROPÄISCHE NORM
ICS 29.020; 91.120.40 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 généraux Teil 1: Allgemeine Grundsätze
(CEI 62305-1:2010, modifiée) (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 Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62305-1:2011 E
Foreword
The text of document 81/370/FDIS, future edition 2 of IEC 62305-1, prepared by IEC TC 81, 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.
__________
- 3 - EN 62305-1:2011
Annex ZA
(normative)
Normative references to international publications
with 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 - EN 62305-2 2011
Part 2: Risk management
IEC 62305-3 2010 Protection against lightning - EN 62305-3 2011
Part 3: Physical damage to structures and life
hazard
IEC 62305-4 2010 Protection against lightning - EN 62305-4 2011
Part 4: Electrical and electronic systems within
structures
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
– 2 – 62305-1 Ó IEC:2010(E)
CONTENTS
FOREW ORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normativ e 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 B (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
com ponents . 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
dam age . 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 T � 2 ms) . 27
Figure A.2 – Definitions of long duration stroke parameters (typically 2 ms �T
LONG
�1 s) . 28

62305-1 Ó IEC:2010(E) – 3 –
Figure A.3 – Possible components of downward flashes (typical in flat territory and
to lower structures) . 28
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
Figure C.4 – Example test generator for the simulation of the front steepness of the
subsequent negative impulses for large test items . 47
Figure D.1 – General arrangement of two conductors for the calculation of
electrodynamic force . 54
Figure D.2 – Typical conductor arrangement in an LPS. 55
Figure D.3 – Diagram of the stresses F for the configuration of Figure D.2. 55
Figure D.4 – Force per unit length F’ along the horizontal conductor of Figure D.2 . 56

Table 1 – Effects of lightning on typical structures . 15
Table 2 – Damage and loss relevant to a structure according to different points of
strike of lightning . 17
Table 3 – Maximum values of lightning parameters according to LPL . 22
Table 4 – Minimum values of lightning parameters and related rolling sphere radius
corresponding to LPL . 22
Table 5 – Probabilities for the limits of the lightning current parameters . 23
Table A.1 – Tabulated values of lightning current parameters taken from CIGRE
[3], [4]
(Electra No. 41 or No. 69) . 31
Table A.2 – Logarithmic normal distribution of lightning current parameters – Mean
m and dispersion σ calculated from 95 % and 5 % values from CIGRE (Electra No.
log
[3], [4]
41 or No. 69) . 32
Table A.3 – Values of probability P as function of
...