EN 62305-3:2006

SLOVENSKI STANDARD
01-junij-2006
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Protection against lightning -- Part 3: Physical damage to structures and life hazard
Blitzschutz -- Teil 3: Schutz von baulichen Anlagen und Personen
Protection contre la foudre -- Partie 3: Dommages physiques sur les structures et risques
humains
Ta slovenski standard je istoveten z: EN 62305-3:2006
ICS:
91.120.40 =DãþLWDSUHGVWUHOR Lightning protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 62305-3
NORME EUROPÉENNE
February 2006
EUROPÄISCHE NORM
ICS 29.020; 91.120.40
English version
Protection against lightning
Part 3: Physical damage to structures and life hazard
(IEC 62305-3:2006, modified)
Protection contre la foudre Blitzschutz
Partie 3: Dommages physiques Teil 3: Schutz von baulichen Anlagen
sur les structures et risques humains und Personen
(CEI 62305-3:2006, modifiée) (IEC 62305-3:2006, modifiziert)

This European Standard was approved by CENELEC on 2006-02-01. 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, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Rumania, 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

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62305-3:2006 E
Foreword
The text of document 81/264/FDIS, future edition 1 of IEC 62305-3, prepared by IEC TC 81, Lightning
protection, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 62305-2 on 2006-02-01.
A draft amendment, prepared by the Technical Committee CENELEC TC 81X, Lightning protection,
containing some common modifications to document 81/264/FDIS, was submitted to the formal vote and
was approved by CENELEC on 2006-02-01 for inclusion into EN 62305-2.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2006-11-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2009-02-01
with the EN have to be withdrawn
This European Standard makes reference to International Standards. Where the International Standard
referred to has been endorsed as a European Standard or a home-grown European Standard exists, this
European Standard shall be applied instead. Pertinent information can be found on the CENELEC web
site.
__________
- 3 - EN 62305-3:2006
Endorsement notice
The text of the International Standard IEC 62305-2:2006 was approved by CENELEC as a European
Standard with agreed common modifications as given below.
COMMON MODIFICATIONS
3 Terms and definitions
Modify the following definitions as follows:
3.16
connecting component
part of an external LPS which is used for the connection of conductors to each other or to metallic
installations, defined as in EN 50164 series
3.17
fixing component
part of an external LPS which is used to fix the elements of the LPS to the structure to be protected,
defined as in EN 50164 series
Annex E
E.4.3.3 Welding or clamping to the steel-reinforcing rods
Modify the Note as follows:
NOTE Specifically designed clamps complying with and tested according to the EN 50164 series shall be used.
E.4.3.7 Down-conductors
Modify the 12th paragraph as follows:
If steel structures are used as down-conductors every steel column shall be connected to the steel
reinforcing rods of the concrete foundation according to Figure E.8 by proprietary bonding points
complying with the EN 50164 series
E.5.2.4.1 General information
Modify the first paragraph as follows:
The maximum permissible temperature for a conductor will not be exceeded if the cross-section complies
with Table 6 and the EN 50164 series.
E.5.2.4.2 Non-isolated air-termination
Add at the end of the second paragraph:
NOTE Z1  For more details see EN 50164 series.
E.5.5 Components
Replace the text of the subclause by:
Components of LPS shall withstand the electromagnetic effects of lightning current and predictable
accidental stresses without being damaged. This can be achieved by choosing components that have
successfully been tested in accordance with the EN 50164 series.
All components shall comply with the EN 50164 series.

E.5.6.1 Mechanical design
Modify the 6th paragraph as follows:
The LPS designer and the LPS installer should specify conductor fasteners and fixtures which will
withstand the electrodynamic forces of lightning current in the conductors and also allow for the
expansion and contraction of conductors due to the relevant temperature rise according to the EN 50164
series.
E.5.6.2.1 Materials
Modify the first paragraph 1 as follows:
LPS materials and conditions of use are listed in Table 5 and the EN 50164 series.
E.5.6.2.2.1 Metals in soil and air
Modify the Note as follows:
NOTE Spark gaps having a protection level U of 2,5 kV and a minimum I of 50 kA (10/350 µs) complying with EN 50164-3 are
p imp
suitable.
IEC 62305-3
Edition 1.0 2006-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Protection against lightning –
Part 3: Physical damage to structures and life hazard

Protection contre la foudre –
Partie 3: Dommages physiques sur les structures et risques humains

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XG
CODE PRIX
ICS 29.020; 91.120.40 ISBN 2-8318-8366-0

62305-3 © IEC:2006 – 3 – – 2 – 62305-3 © IEC:2006
CONTENTS
FOREWORD. 6
INTRODUCTION. 8

1 Scope. 9
2 Normative references . 9
3 Terms and definitions .10
4 Lightning protection system (LPS) .13
4.1 Class of LPS .13
4.2 Design of the LPS .14
4.3 Continuity of steelwork in reinforced concrete structures .14
5 External lightning protection system .15
5.1 General .15
5.2 Air-termination systems.15
5.3 Down-conductor systems.19
5.4 Earth-termination system.22
5.5 Components .24
5.6 Materials and dimensions .26
6 Internal lightning protection system .29
6.1 General .29
6.2 Lightning equipotential bonding .29
6.3 Electrical insulation of the external LPS .32
7 Maintenance and inspection of an LPS .33
7.1 Application of inspections.33
7.2 Order of inspections .33
7.3 Maintenance.33
8 Protection measures against injury to living beings due to touch and step voltages .34
8.1 Protection measures against touch voltages.34
8.2 Protection measures against step voltages.34

Annex A (normative) Positioning the air-termination system.35
Annex B (normative) Minimum cross-section of the entering cable screen in order to
avoid dangerous sparking .41
Annex C (informative) Partitioning of the lightning current amongst down-conductors .42
Annex D (informative) Additional information for LPS in the case of structures with a
risk of explosion.46
Annex E (informative) Guidelines for the design, construction, maintenance and
inspection of lightning protection systems . 52

Bibliography.154

62305-3 © IEC:200662305-3 © IEC:2006 – 5 – – 3 –
Figure 1 – Loop in a down-conductor .20
Figure 2 – Minimum length l of each earth electrode according to the class of LPS.22
Figure A.1 – Volume protected by a vertical air-termination rod .35
Figure A.2 – Volume protected by a vertical air-termination rod .36
Figure A.3 – Volume protected by a wire air-termination system .36
Figure A.4 – Volume protected by isolated wires combined in a mesh according to the
protective angle method and rolling sphere method .37
Figure A.5 – Volume protected by non-isolated wires combined in a mesh according to
the mesh method and the protective angle method .38
Figure A.6 – Design of an air-termination system according to the rolling sphere
method .39
Figure C.1 – Values of coefficient k in the case of a wire air-termination system and a
c
type B earth-termination system.43
Figure C.2 – Values of coefficient k in the case of a mesh air-termination system and
c
type B earth-termination system.44
Figure C.3 – Examples of calculation of the separation distance in the case of a
meshed air-termination system, an interconnecting ring of the down-conductors at
each level and a type B earth-termination system .45
Figure E.1 – LPS design flow diagram . 54
Figure E.2 – Values of coefficient k in case of a sloped roof with air-termination on
c
the ridge and a type B earthing system . 61
Figure E.3 – LPS design for a cantilevered part of a structure. 62
Figure E.4 – Equipotential bonding in a structure with a steel reinforcement . 64
Figure E.5 – Welded joints of reinforcing rods in reinforced concrete, if permitted. 65
Figure E.6 – Example of clamps used as joints between reinforcing rods and
conductors. 66
Figure E.7 – Examples for connection points to the reinforcement in a reinforced
concrete wall . 67
Figure E.8 – Use of metallic facade as natural down-conductor system and connection
of facade supports .
...