EN 62305-4:2011

SLOVENSKI STANDARD
01-maj-2011
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SIST EN 62305-4:2006
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Protection against lightning - Part 4: Electrical and electronic systems within structures
Blitzschutz - Teil 4: Elektrische und elektronische Systeme in baulichen Anlagen
Protection contre la foudre - Partie 4: Réseaux de puissance et de communication dans
les structures
Ta slovenski standard je istoveten z: EN 62305-4:2011
ICS:
91.120.40 =DãþLWDSUHGVWUHOR Lightning protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62305-4
NORME EUROPÉENNE
February 2011
EUROPÄISCHE NORM
ICS 29.020; 91.120.40 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)
Protection contre la foudre -  Blitzschutz - Teil 4: Elektrische und
Partie 4: Réseaux de puissance et de elektronische Systeme in baulichen
communication dans les structures Anlagen
(CEI 62305-4:2010, modifiée) (IEC 62305-4:2010, 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 62305-4:2011 E
Foreword
The text of document 81/373/FDIS, future edition 2 of IEC 62305-4, prepared by IEC TC 81, 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.
__________
- 3 - EN 62305-4:2011
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 60364-5-53 2001 Electrical installations of buildings - - -
Part 5-53: Selection and erection of electrical
equipment - Isolation, switching and control

IEC 60664-1 2007 Insulation coordination for equipment within EN 60664-1 2007
low-voltage systems -
Part 1: Principles, requirements and tests

IEC 61000-4-5 2005 Electromagnetic compatibility (EMC) - EN 61000-4-5 2006
Part 4-5: Testing and measurement
techniques - Surge immunity test

IEC 61000-4-9 1993 Electromagnetic compatibility (EMC) - EN 61000-4-9 1993
Part 4-9: Testing and measurement
techniques - Pulse magnetic field immunity
test
IEC 61000-4-10 1993 Electromagnetic compatibility (EMC) - EN 61000-4-10 1993
Part 4-10: Testing and measurement
techniques - Damped oscillatory magnetic
field immunity test
IEC 61643-1 2005 Low-voltage surge protective devices - - -
Part 1: Surge protective devices connected to
low-voltage power distribution systems -
Requirements and tests
IEC 61643-12 (mod) 2008 Low-voltage surge protective devices - CLC/TS 61643-12 2009
Part 12: Surge protective devices connected
to low-voltage power distribution systems -
Selection and application principles

IEC 61643-21 - Low voltage surge protective devices - EN 61643-21 -
Part 21: Surge protective devices connected
to telecommunications and signalling
networks - Performance requirements and
testing methods
IEC 61643-22 (mod) - Low-voltage surge protective devices - CLC/TS 61643-22 -
Part 22: Surge protective devices connected
to telecommunications and signalling
networks - Selection and application principles

IEC 62305-1 2010 Protection against lightning - EN 62305-1 2011
Part 1: General principles
IEC 62305-2 2010 Protection against lightning - EN 62305-2 2011
Part 2: Risk management
Publication Year Title EN/HD Year

IEC 62305-3 2010 Protection against lightning - EN 62305-3 2011
Part 3: Physical damage to structures and life
hazard
IEC 62305-4 ®
Edition 2.0 2010-12
INTERNATIONAL
STANDARD
Protection against lightning –
Part 4: Electrical and electronic systems within structures

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XC
ICS 29.020; 91.120.40 ISBN 978-2-88912-283-7
– 2 – 62305-4 Ó IEC:2010(E)
CONTENTS
FOREW ORD . 5
INTRODUCTION . 7
1 Sc o pe . 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 B (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
Figure 5 – Example of a three-dimensional earthing system consisting of the bonding
network interconnected with the earth-termination system . 22
Figure 6 – Meshed earth-termination system of a plant . 23

62305-4 Ó IEC:2010(E) – 3 –
Figure 7 – Utilization of reinforcing rods of a structure for equipotential bonding . 25
Figure 8 – Equipotential bonding in a structure with steel reinforcement . 26
Figure 9 – Integration of conductive parts of internal systems into the bonding network . 27
Figure 10 – Combinations of integration methods of conductive parts of internal
systems into the bonding network . 28
Figure A.1 – LEMP situation due to lightning strike . 37
Figure A.2 – Simulation of the rise of magnetic field by damped oscillations . 40
Figure A.3 – Large volume shield built by metal reinforcement and metal frames . 41
Figure A.4 – Volume for electrical and electronic systems inside an inner LPZ n . 42
Figure A.5 – Reducing induction effects by line routing and shielding measures . 43
Figure A.6 – Example of SPM for an office building . 45
Figure A.7 – Evaluation of the magnetic field values in case of a direct lightning strike . 46
Figure A.8 – Evaluation of the magnetic field values in case of a nearby lightning strike . 48
Figure A.9 – Distance s depending o
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