Protection against lightning - Part 3: Physical damages to structures and life hazard

IEC 62305-3 provides the requirements for protection of a structure against physical damage by means of a lightning protection system (LPS), and for protection against injury to living beings due to touch and step voltages in the vicinity of an LPS (see IEC 62305-1). This standard is applicable to design, installation, inspection and maintenance of an LPS for structures without limitation of their height and to establishment of measures for protection against injury to living beings due to touch and step voltages.

Blitzschutz - Teil 3: Schutz von baulichen Anlagen und Personen

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

La CEI 62305-3:2010 spécifie les exigences pour la protection d'une structure contre les dommages physiques par un système de protection contre la foudre (SPF) et pour la protection contre les blessures d'êtres vivants dues aux tensions de contact et de pas à proximité d'un SPF (voir la CEI 62305-1). Cette deuxième édition annule et remplace la première édition, parue en 2006, dont elle constitue une révision technique. La présente édition comprend les modifications techniques importantes suivantes par rapport à la précédente édition:
1) Les épaisseurs minimales des tôles ou canalisations métalliques indiquées dans le Tableau 3 pour les dispositifs de capture sont supposées comme non capables d'éviter les problèmes de points chauds.
2) L'acier comportant un dépôt électrolytique de cuivre est introduit comme matériau adapté aux SPF.
3) Certaines surfaces de section des conducteurs du système de protection ont été légèrement modifiées.
4) A des fins de liaison, des éclateurs sont utilisés pour les installations métalliques, tandis que le parafoudre est utilisé pour les réseaux internes.
5) Deux méthodes simplifiée et détaillée sont fournies pour l'évaluation de la distance de séparation.
6) Les mesures de protection contre les blessures d'êtres vivants dues à un choc électrique sont également prises en compte à l'intérieur de la structure.
7) Une information plus complète concernant le système de protection contre la foudre (SPF) dans le cas de structures présentant un risque d'explosion est fournie à l'Annexe D (normative).
La présente version bilingue (2012-06) correspond à la version anglaise monolingue publiée en 2010-12.

Zaščita pred delovanjem strele - 3. del: Fizična škoda na zgradbah in nevarnost za živa bitja (IEC 62305-3:2010, spremenjen)

IEC 62305-3 podaja zahteve za zaščito zgradb pred fizično škodo s sistemom za zaščito pred delovanjem strele (LPS) in za zaščito pred poškodbami živih bitij zaradi napetosti dotika in napetosti koraka v bližini LPS (glej IEC 62305-1). Ta standard velja za projektiranje, namestitev, nadzor in vzdrževanje sistema LPS za zgradbe brez omejitve glede višine in za vzpostavitev ukrepov za zaščito pred poškodbami živih bitij zaradi napetosti dotika in koraka.

General Information

Status
Published
Public Enquiry End Date
30-Dec-2009
Publication Date
11-Apr-2011
Technical Committee
Current Stage
6100 - Translation of adopted SIST standards (Adopted Project)
Start Date
06-Aug-2012
Due Date
05-Aug-2013
Completion Date
13-Feb-2013

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Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62305-3:2011
01-maj-2011
1DGRPHãþD
SIST EN 62305-3:2006
SIST EN 62305-3:2006/A11:2009
=DãþLWDSUHGGHORYDQMHPVWUHOHGHO)L]LþQDãNRGDQD]JUDGEDKLQQHYDUQRVW]D
åLYDELWMD ,(&VSUHPHQMHQ
Protection against lightning - Part 3: Physical damages 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 62305-3:2011
ICS:
91.120.40 =DãþLWDSUHGVWUHOR Lightning protection
SIST EN 62305-3:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 62305-3:2011

---------------------- Page: 2 ----------------------

SIST EN 62305-3:2011

EUROPEAN STANDARD
EN 62305-3

NORME EUROPÉENNE
March 2011
EUROPÄISCHE NORM

ICS 29.020; 91.120.40 Supersedes EN 62305-3:2006 + corr. Nov.2006 + corr. Sep.2008 + A11:2009


English version


Protection against lightning -
Part 3: Physical damage to structures and life hazard
(IEC 62305-3:2010, modified)


Protection contre la foudre -  Blitzschutz -
Partie 3: Dommages physiques sur les Teil 3: Schutz von baulichen Anlagen und
structures et risques humains Personen
(CEI 62305-3:2010, modifiée) (IEC 62305-3:2010, modifiziert)




This European Standard was approved by CENELEC on 2011-01-02. 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 62305-3:2011 E

---------------------- Page: 3 ----------------------

SIST EN 62305-3:2011
EN 62305-3:2011 - 2 -
Foreword
The text of the International Standard IEC 62305-3:2010, prepared by IEC TC 81, Lightning protection,
together with common modifications prepared by the Technical Committee CENELEC TC 81X, Lightning
protection, was submitted to the formal vote and was approved by CENELEC as EN 62305-3 on
2011-01-02.
This European Standard supersedes EN 62305-3:2006 + corr. Nov.2006 + corr. Sep.2008 + A11:2009.
This EN 62305-3:2011 includes the following significant technical changes with respect to
EN 62305-3:2006 + corr. Nov.2006 + corr. Sep.2008 + A11:2009:
1) Minimum thicknesses of metal sheets or metal pipes given in Table 3 for air-termination systems are
assumed as not able to prevent hot-spot problems.
2) Steel with electro-deposited copper is introduced as material suitable for LPS.
3) Some cross-sectional areas of LPS conductors were slightly modified.
4) For bonding purposes, isolating spark gaps are used for metal installations and SPD for internal
systems.
5) Two methods – simplified and detailed – are provided for evaluation of separation distance.
6) Protection measures against injuries of living beings due to electric shock are considered also inside
the structure.
7) Improved information for LPS in the case of structures with a risk of explosion are given in Annex D
(normative).
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) 2012-01-02
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-01-02
__________
Endorsement notice
The text of the International Standard IEC 62305-3:2010 was approved by CENELEC as a European
Standard with agreed common modifications as given below.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
[2] IEC 61400-24 NOTE  Harmonized as EN 61400-24.

COMMON MODIFICATIONS
Through the complete document:
Replace all references to IEC 62305 by references to EN 62305.

---------------------- Page: 4 ----------------------

SIST EN 62305-3:2011
- 3 - EN 62305-3:2011
Replace all references to IEC 62561 by references to EN 50164.
2 Normative references
Replace this subclause by:
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.
EN 50164-1 Lightning Protection Components (LPC) – Part 1: Requirements for connection
components
EN 50164-2 Lightning Protection Components (LPC) – Part 2: Requirements for conductors
and earth electrodes
EN 50164-3 Lightning Protection Components (LPC) – Part 3: Requirements for isolating
spark gaps
EN 50164-4 Lightning Protection Components (LPC) – Part 4: Requirements for conductor
fasteners
EN 50164-5 Lightning Protection Components (LPC) – Part 5: Requirements for earth
electrode inspection housings and earth electrode seals
EN 50164-6 Lightning Protection Components (LPC) – Part 6: Requirements for lightning
strike counters
EN 50164-7 Lightning Protection Components (LPC) – Part 7: Requirements for earthing
enhancing compounds
NOTE  The above mentioned standards EN 50164 series will ultimately be replaced by EN 62561 series. EN 50164 series will still
be valid for 72 months from the issuing date of each part of the EN 50164 series.
EN 60079-10-1:2009 Explosive atmospheres – Part 10-1: Classification of areas – Explosive gas
atmospheres (IEC 60079-10-1:2008)
EN 60079-10-2:2009 Explosive atmospheres – Part 10-2: Classification of areas – Combustible dust
atmospheres (IEC 60079-10-2:2009)
EN 60079-14:2008 Explosive atmospheres – Part 14: Electrical installations design, selection and
erection (IEC 60079-14:2007)
EN 61557-4 Electrical safety in low voltage distribution systems up to 1 000 V a.c. and
1 500 V d.c. – Equipment for testing, measuring or monitoring of protective
measures – Part 4: Resistance of earth connection and equipotential bonding
(IEC 61557-4)
EN 61643-11 Low-voltage surge protective devices – Part 1: Surge protective devices
connected to low-voltage power distribution systems – Requirements and tests
(IEC 61643-1)
EN 61643-21 Low voltage surge protective devices – Part 21: Surge protective devices
connected to telecommunications and signalling networks – Performance
requirements and testing methods (IEC 61643-21)
EN 62305-1:2011 Protection against lightning – Part 1: General principles (IEC 62305-1:2010,
modified)
EN 62305-2:2011 Protection against lightning – Part 2: Risk management (IEC 62305-2:2010,
modified)
EN 62305-4:2011 Protection against lightning – Part 4: Electrical and electronic systems within
structures (IEC 62305-4:2010, modified)

---------------------- Page: 5 ----------------------

SIST EN 62305-3:2011
EN 62305-3:2011 - 4 -
1)
EN 62561 series Lightning Protection System Components (LPSC) (IEC 62561 series)
2)
EN 62561-1 Lightning Protection System Components (LPSC) – Part 1: Requirements for
connection components (IEC 62561)
2)
EN 62561-3 Lightning Protection System Components (LPSC) – Part 3: Requirements for
isolating spark gaps (IEC 62561-3)
ISO 3864-1 Graphical symbols – Safety colours and safety signs – Part 1: Design principles
for safety signs in workplaces and public areas
3 Terms and definitions
Definition 3.16
Add at the end of the paragraph: “… as defined in the EN 50164 series.”
Definition 3.17
Add at the end of the paragraph: “… as defined in the EN 50164 series.”
4 Lightning protection system (LPS)
4.3 Continuity of steelwork in reinforced concrete structures
Replace NOTE 2 by:
NOTE 2  When the continuity of steelwork in reinforced concrete is intended to be established by clamping, specifically designed
clamps complying with and tested according to EN 50164-1, should be used.
5 External lightning protection system
5.5.1 General
After the first paragraph, add the following paragraph:
All components shall comply with the EN 50164 series.
5.5.3 Connections
nd
In the 2 paragraph, replace “the future IEC 62561-1” with “EN 50164-1”.
5.6.2 Dimensions
Replace the first paragraph by:
Materials, configurations and minimum cross-sectional areas of air-termination conductors, air-termination
rods, down-conductors and earth lead-in rods are given in Table 6 and shall comply with the requirements
and tests according to the EN 50164 series.
Add at the beginning of the second paragraph “Materials, …” and replace at the end of the paragraph
“IEC 62561 series” with “EN 50164 series”.
In Table 7, delete the NOTE “f”.

1)
In preparation.
2)
At draft stage.

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SIST EN 62305-3:2011
- 5 - EN 62305-3:2011
Annex E (informative) Guidelines for the design, construction, maintenance and
inspection of lightning protection systems
E.4.2.3.2 Mechanical design
In the first sentence of the NOTE, replace “may” with “should” and “IEC 62561” with “EN 50164”.
In the last paragraph, replace “could” with “should” and “IEC 62561” with “EN 50164”.
E.4.3.3 Welding or clamping to the steel-reinforcing rods
In the NOTE, replace “IEC 62561 series of standards are suitable” with “EN 50164 series of standards
should be used”.
E.4.3.7 Down-conductors
th
Replace the 12 paragraph (i.e. after Figure E.9) by:
“If steel structures are used as down-conductors, every steel column should be connected to the steel
reinforcing rods of the concrete foundation according to Figure E.7 by purposely designed bonding points
complying with EN 50164 series.”
E.5.2.4.1 General information
Replace the first paragraph by:
“The maximum permissible temperature for a conductor will not be exceeded if its cross-section complies
with Table 6 and the EN 50164 series.”
E.5.2.4.2 Non-isolated air-termination
nd
After the 2 paragraph, add the following NOTE:
NOTE  For more details see EN 50164 series.
E.5.5 Components
st
Replace the 1 paragraph by:
“Components of LPS should 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
th
At the end of the 6 paragraph, add the following:
“…according to the EN 50164 series.”
E.5.6.2.1 Materials
st
At the end of the 1 line, add the following:
“and the EN 50164 series”
E.5.6.2.2.1 Metals in soil and air
Replace the NOTE by:
NOTE  Isolating spark gaps having a protection level U of 2,5 kV and a minimum I of 50 kA (10/350 µs) complying with
p imp
EN 50164-3 are suitable.

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SIST EN 62305-3:2011

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SIST EN 62305-3:2011

IEC 62305-3
®
Edition 2.0 2010-12
INTERNATIONAL
STANDARD

colour
inside

Protection against lightning –
Part 3: Physical damage to structures and life hazard


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
XG
ICS 29.020; 91.120.40 ISBN 978-2-88912-282-0
® Registered trademark of the International Electrotechnical Commission

---------------------- Page: 9 ----------------------

SIST EN 62305-3:2011
– 2 – 62305-3 Ó IEC:2010(E)
CONTENTS
FOREW ORD . 7
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 11
3 Terms and definitions . 12
4 Lightning protection system (LPS) . 15
4.1 Class of LPS . 15
4.2 Design of the LPS . 16
4.3 Continuity of steelwork in reinforced concrete structures . 16
5 External lightning protection system . 17
5.1 General . 17
5.1.1 Application of an external LPS . 17
5.1.2 Choice of external LPS . 17
5.1.3 Use of natural components . 17
5.2 Air-termination systems . 18
5.2.1 General . 18
5.2.2 Positioning . 18
5.2.3 Air-terminations against flashes to the side of tall structures . 19
5.2.4 Construction . 20
5.2.5 Natural components . 20
5.3 Down-conductor systems . 21
5.3.1 General . 21
5.3.2 Positioning for an isolated LPS . 22
5.3.3 Positioning for a non-isolated LPS . 22
5.3.4 Construction . 23
5.3.5 Natural components . 23
5.3.6 Test joints . 24
5.4 Earth-termination system . 24
5.4.1 General . 24
5.4.2 Earthing arrangement in general conditions . 25
5.4.3 Installation of earth electrodes . 26
5.4.4 Natural earth electrodes. 27
5.5 Components . 27
5.5.1 General . 27
5.5.2 Fixing. 28
5.5.3 Connections . 28
5.6 Materials and dimensions. 29
5.6.1 Materials . 29
5.6.2 Dimensions . 29
6 Internal lightning protection system . 31
6.1 General . 31
6.2 Lightning equipotential bonding . 32
6.2.1 General . 32
6.2.2 Lightning equipotential bonding for metal installations . 32
6.2.3 Lightning equipotential bonding for external conductive parts. 33
6.2.4 Lightning equipotential bonding for internal systems . 34

---------------------- Page: 10 ----------------------

SIST EN 62305-3:2011
62305-3 Ó IEC:2010(E) – 3 –
6.2.5 Lightning equipotential bonding for lines connected to the structure to
be protected . 34
6.3 Electrical insulation of the external LPS . 35
6.3.1 General . 35
6.3.2 Simplified approach . 36
6.3.3 Detailed approach . 36
7 Maintenance and inspection of an LPS . 37
7.1 General . 37
7.2 Application of inspections . 37
7.3 Order of inspections . 37
7.4 Maintenance . 37
8 Protection measures against injury to living beings due to touch and step voltages . 37
8.1 Protection measures against touch voltages . 37
8.2 Protection measures against step voltages . 38
Annex A (normative) Positioning the air-termination system . 39
Annex B (normative) Minimum cross-section of the entering cable screen in order to
avoid dangerous sparking. 45
Annex C (informative) Evaluation of the separation distance s. 46
Annex D (normative) Additional information for LPS in the case of structures with a
risk of explosion . 52
Annex E (informative) Guidelines for the design, construction, maintenance and
inspection of lightning protection systems . 59
Bibliography . 156

Figure 1 – Protection angle corresponding to the class of LPS . 19
Figure 2 – Loop in a down-conductor . 23
Figure 3 – Minimum length l of each earth electrode according to the class of LPS . 25
1
Figure A.1 – Volume protected by a vertical air-termination rod . 39
Figure A.2 – Volume protected by a vertical air-termination rod . 40
Figure A.3 – Volume protected by a wire air-termination system . 40
Figure A.4 – Volume protected by isolated wires combined in a mesh according to the
protection angle method and rolling sphere method . 41
Figure A.5 – Volume protected by non-isolated wires combined in a mesh according to
the mesh method and the protection angle method . 42
Figure A.6 – Design of an air-termination system according to the rolling sphere
method . 43
Figure C.1 – Values of coefficient k in the case of a wire air-termination system . 46
c
Figure C.2 – Values of coefficient k in the case of multiple down-conductors system . 47
c
Figure C.3 – Values of coefficient k in the case of a sloped roof with air-termination on
c
the ridge . 49
Figure C.4 – Examples of calculation of the separation distance in the case of multiple
down-conductors with an interconnecting ring of the down-conductors at each level . 50
Figure C.5 – Values of coefficient k in the case of a meshed air-termination system,
c
with a multiple down-conductors system . 51
Figure E.1 – LPS design flow diagram . 61
Figure E.2 – LPS design for a cantilevered part of a structure . 67
Figure E.3 – Measuring the overall electrical resistance . 68

---------------------- Page: 11 ----------------------

SIST EN 62305-3:2011
– 4 – 62305-3 Ó IEC:2010(E)
Figure E.4 – Equipotential bonding in a structure with a steel reinforcement . 70
Figure E.5 – Typical methods of joining reinforcing rods in concrete (where permitted) . 71
Figure E.6 – Example of clamps used as joints between reinforcing rods and
conductors . 72
Figure E.7 – Examples for connection points to the reinforcement in a reinforced
concrete wall. 73
Figure E.8 – Use of metallic facade as natural down-conductor system and connection
of facade supports . 77
Figure E.9 – Connection of the continuous strip windows to a metal facade covering . 78
Figure E.10 – Internal down-conductors in industrial structures . 81
Figure E.11 – Installation of bonding conductors in reinforced concrete structures and
flexible bonds between two reinforced concrete parts . 83
Figure E.12 – Protection angle method air-termination design for different heights
according to Table 2 . 87
Figure E.13 – Isolated external LPS using two isolated air-termination masts designed
according to the protection angle air-termination design method . 88
Figure E.14 – Isolated external LPS using two isolated air-termination masts,
interconnected by horizontal catenary wire . 89
Figure E.15 – Example of design of an air-termination of a non-isolated LPS by air-
termination rods . 90
Figure E.16 – Example of design of an air-termination of a non isolated LPS by a
horizontal wire according to the protection angle air-termination design method . 91
Figure E.17 – Protected volume of an air- termination rod on a sloped surface using
the protection angle design method . 92
Figure E.18 – Design of an LPS air-termination conductor network on a structure with
complicated shape . 93
Figure E.19 – Design of an LPS air-termination according to the protection angle
method, mesh method and general arrangement of air-termination elements . 94
Figure E.20 – Space protected by two parallel air-termination horizontal wires or two
air-termination rods (r > h ) . 95
t
Figure E.21 – Three examples of design of non-isolated LPS air-termination according
to the mesh method air-termination design . 98
Figure E.22 – Four examples of details of an LPS on a structure with sloped tiled roofs . 100
Figure E.23 – Air-termination and visually concealed conductors for buildings less
than 20 m high, with sloping roofs . 101
Figure E.24 – Construction of an LPS using natural components on the roof of the
structure . 103
Figure E.25 – Positioning of the external LPS on a structure made of isolating material
e.g. wood or bricks with a height up to 60 m with flat roof and with roof fixtures . 104
Figure E.26 – Construction of air-termination network on a roof with conductive
covering where puncturing of the covering is not acceptable . 105
Figure E.27 – Construction of external LPS on a structure of steel-reinforced concrete
using the reinforcement of the outer walls as natural components . 106
Figure E.28 – Example of an air-termination stud used on car park roofs . 107
Figure E.29 – Air-termination rod used for protection of a metallic roof fixture with
electric power installations which are not bonded to the air-termination system . 108
Figure E.30 – Method of achieving electrical continuity on metallic parapet capping . 109
Figure E.31 – Metallic roof fixture protected against direct lightning interception,
connected to air-termination system . 112

---------------------- Page: 12 ----------------------

SIST EN 62305-3:2011
62305-3 Ó IEC:2010(E) – 5 –
Figure E.32 – Examplesof lightning protection of a house with a TV antenna . 115
Figure E.33 – Installation of lightning protection of metallic equipment on a roof against
a direct lightning flash . 116
Figure E.34 – Connection of natural air-termination rod to air-termination conductor . 118
Figure E.35 – Construction of the bridging between the segments of the metallic
facade plates . 119
Figure E.36 – Installation of external LPS on a structure of insulating material with
different roof levels . 122
Figure E.37 – Five examples of geometry of LPS conductors . 123
Figure E.38 – Construction of an LPS using only two down-conductors and foundation
earth electrodes . 124
Figure E.39 – Four examples of connection of earth-termination to the LPS of
structures using natural down-conductors (girders) and detail of a test joint. 128
Figure E.40 – Construction of foundation earth ring for structures of different
foundation design . 132
Figure E.41 – Two examples of vertical electrodes in type A earthing arrangement . 134
Figure E.42 – Meshed earth-termination system of a plant . 137
Figu
...

SLOVENSKI SIST EN 62305-3

STANDARD
maj 2011












Zaščita pred delovanjem strele – 3. del: Fizična škoda na zgradbah in
nevarnost za živa bitja (IEC 62305-3:2010, spremenjen)

Protection against lightning – Part 3: Physical damages to structures and life
hazard (IEC 62305-3:2010, modified)

Protection contre la foudre – Partie 3: Dommages physiques sur les structures et
risques humains (CEI 62305-3:2010, modifieé)

Blitzschutz – Teil 3: Schutz von baulichen Anlagen und Personen (IEC 62305-
2:2010, modifiziert)























Referenčna oznaka

ICS 91.120.40 SIST EN 62305-3:2011 (sl)


Nadaljevanje na straneh II in III ter od 1 do 150

© 2013-03. Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 62305-3 : 2011
NACIONALNI UVOD

Standard SIST EN 62305-3 (sl), Zaščita pred delovanjem strele – 3. del: Fizična škoda na zgradbah in
nevarnost za živa bitja (IEC 62305-3:2010, spremenjen), 2011, ima status slovenskega standarda in je
enakovreden evropskemu standardu EN 62305-3 (en), Protection against lightning – Part 3: Physical
damages to structures and life hazard (IEC 62305-3:2010, modified), 2011.

NACIONALNI PREDGOVOR
Evropski standard EN 62305-3:2011 je pripravil tehnični odbor Evropskega komiteja za
standardizacijo v elektrotehniki CLC/TC 81X Zaščita pred delovanjem strele.

Slovenski standard SIST EN 62305-3:2011 je prevod evropskega standarda EN 62305-3:2011. V
primeru spora glede besedila slovenskega prevoda v tem standardu je odločilen izvirni mednarodni
standard v angleškem jeziku. Slovensko izdajo standarda je pripravil tehnični odbor SIST/TC STZ
Zaščita pred delovanjem strele.

Odločitev za izdajo tega standarda je dne 4. maja 2011 sprejel SIST/TC STZ Zaščita pred delovanjem
strele.

ZVEZA Z NACIONALNIMI STANDARDI
S privzemom tega mednarodnega standarda veljajo za omenjeni namen referenčnih standardov vsi
standardi, navedeni v izvirniku, razen tistih, ki so že sprejeti v nacionalno standardizacijo:

SIST EN 50164-1:2008 Elementi za zaščito pred strelo (LPC) – 1. del: Zahteve za povezovalne
elemente
SIST EN 50164-2:2008 Elementi za zaščito pred strelo (LPC) – 2. del: Zahteve za vodnike in
ozemljila
SIST EN 50164-3:2006 Elementi za zaščito pred strelo (LPC) – 3. del: Zahteve za iskrišča
SIST EN 50164-4:2008 Elementi za zaščito pred strelo (LPC) – 4. del: Zahteve za pritrdilne
elemente
SIST EN 50164-5:2009 Elementi za zaščito pred strelo (LPC) – 5. del: Zahteve za merilne
omarice ozemljil in tesnjenje izolacije pri ozemljilih
SIST EN 50164-6:2009 Elementi za zaščito pred strelo (LPC) – 6. del: Zahteve za števce udarov
strele
SIST EN 50164-7:2008 Elementi za zaščito pred strelo (LPC) – 7. del: Zahteve za spojine, ki
izboljšajo ozemljitev
SIST EN 60079-10-1:2009 Eksplozivne atmosfere – 10-1. del: Razvrstitev prostorov – Eksplozivne
plinske atmosfere (IEC 60079-10-1:2008)
SIST EN 60079-10-2:2009 Eksplozivne atmosfere – 10-2. del: Razdelitev eksplozijsko ogroženih
prostorov - Eksplozivne prašne atmosfere (IEC 60079-10-2:2009)
SIST EN 60079-14:2009 Eksplozivne atmosfere – 14. del: Načrtovanje, izbira in namestitev
električnih inštalacij (IEC 60079-14:2007)
SIST EN 61557-4:2007 Električna varnost v nizkonapetostnih razdelilnih sistemih izmenične
napetosti do 1 kV in enosmerne napetosti do 1,5 kV – Oprema za
preskušanje, merjenje ali nadzorovanje zaščitnih ukrepov – 4. del:
Upornost ozemljitvenega priključka in izenačitev potencialov (IEC 61557-
4:2007)
II

---------------------- Page: 2 ----------------------

SIST EN 62305-3 : 2011
SIST EN 61643-11:2012 Nizkonapetostne naprave za zaščito pred prenapetostnimi udari – 11. del:
Naprave za zaščito pred prenapetostnimi udari za nizkonapetostne
napajalne sisteme - Zahteve in preskusi (IEC 61643-11:2011,
spremenjen)
SIST EN 61643-21:2002 Nizkonapetostne naprave za zaščito pred prenapetostnimi udari – 21. del:
Naprave priključene na telekomunikacijska in signalna omrežja-
Zahtevane lastnosti in preskusne metode (IEC 61643-21:2000 +
popravek mar. 2001)
SIST EN 62305-1:2011 Zaščita pred delovanjem strele – 1. del: Splošna načela (IEC 62305-
1:2010, spremenjen)
SIST EN 62305-2:2012 Zaščita pred delovanjem strele – 2. del: Vodenje rizika (IEC 62305-
2:2010, spremenjen)
SIST EN 62305-4:2011 Zaščita pred delovanjem strele – 4. del: Električni in elektronski sistemi v
zgradbah (IEC 62305-4:2010, spremenjen)
SIST EN 62561 (skupina) Zahteve za elemente sistema za zaščito pred strelo (LPSC)
SIST ISO 3864-1:2012 Grafični simboli – Opozorilne barve in opozorilni znaki – 1. del: Načela
načrtovanja opozorilnih znakov in opozorilnih oznak

OSNOVA ZA IZDAJO STANDARDA
– privzem standarda EN 62305-3:2011
PREDHODNA IZDAJA
– SIST EN 62305-3:2006
– SIST EN 62305-3:2006/A11:2009
OPOMBE
– Povsod, kjer se v besedilu standarda uporablja izraz “evropski standard”, v
SIST EN 62305-3:2011 to pomeni “slovenski standard”.
– Nacionalni uvod in nacionalni predgovor nista sestavni del standarda
– Ta nacionalni dokument je enakovreden EN 62305-3:2011 in je objavljen z dovoljenjem
  CENELEC
  Avenue Marnix 17
  B - 1000 Brussels
  Belgija

This national document is identical with EN 62305-3:2011 and is published with the permission of

  CENELEC
  Avenue Marnix 17
  B - 1000 Brussels
  Belgium

III

---------------------- Page: 3 ----------------------

SIST EN 62305-3 : 2011





























IV

---------------------- Page: 4 ----------------------

EVROPSKI STANDARD EN 62305-3
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM marec 2011


ICS: 29.020; 91.120.40 Nadomešča EN 62305-3:2006 +
popravek September 2008 + A11:2009



Slovenska izdaja

Zaščita pred delovanjem strele – 3. del: Fizična škoda na zgradbah in
nevarnost za živa bitja (IEC 62305-3:2010, spremenjen)



Protection against lightning – Protection contre la foudre – Blitzschutz – Teil 3: Schutz von
Part 3: Physical damages to Partie 3: Dommages physiques sur les baulichen Anlagen und
structures and life hazard structures et risques humains Personen
(IEC 62305-3:2010, modified) (CEI 62305-3:2010, modifieé) (IEC 62305-2:2010, modifiziert)




Ta evropski standard je CENELEC sprejel 2. januarja 2011. Člani CENELEC morajo izpolnjevati
notranje predpise CEN/CENELEC, s katerimi je predpisano, da mora biti ta standard brez kakršnih koli
sprememb sprejet kot nacionalni standard.

Najnovejši seznami teh nacionalnih standardov z njihovimi bibliografskimi podatki se na zahtevo lahko
dobijo pri Centralnem sekretariatu ali katerem koli članu CENELEC.

Ta evropski standard obstaja v treh izvirnih izdajah (angleški, francoski in nemški). Izdaje v drugih
jezikih, ki jih članice CENELEC na lastno odgovornost prevedejo in izdajo ter prijavijo pri Centralnem
sekretariatu CEN, veljajo kot uradne izdaje.

Člani CENELEC so nacionalni elektrotehniški komiteji Avstrije, Belgije, Bolgarije, Cipra, Češke
republike, Danske, Estonije, Finske, Francije, Grčije, Hrvaške, Irske, Islandije, Italije, Latvije, Litve,
Luksemburga, Malte, Madžarske, Nemčije, Nizozemske, Norveške, Poljske, Portugalske, Romunije,
Slovaške, Slovenije, Španije, Švedske, Švice in Združenega kraljestva.







CENELEC
Evropski komite za standardizacijo v elektrotehniki
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung


Upravni center: Avenue Marnix 17, B - 1000 Bruselj

© 2011 CENELEC. Lastnice avtorskih pravic so vse države članice CENELEC. Ref. oznaka EN 62305-3:2011 E

---------------------- Page: 5 ----------------------

SIST EN 62305-3 : 2011
VSEBINA Stran


Predgovor k evropskemu standardu .6
Predgovor k mednarodnemu standardu.11
Uvod .13
1 Področje uporabe .14
2 Zveze s standardi .14
3 Izrazi in definicije .15
4 Sistem zaščite pred delovanjem strele (LPS).18
4.1 Vrsta LPS .18
4.2 Načrtovanje LPS.19
4.3 Neprekinjenost jeklene armature v armiranobetonskih zgradbah.19
5 Zunanji sistem zaščite pred delovanjem strele .19
5.1 Splošno.19
5.2 Lovilni sistemi .20
5.3 Odvodni sistemi.23
5.4 Ozemljitveni sistem.26
5.5 Sestavni deli .29
5.6 Materiali in mere.30
6 Notranji sistem zaščite pred delovanjem strele.32
6.1 Splošno.32
6.2 Izenačitev potencialov .33
6.3 Električna izolacija zunanjega LPS .36
7 Vzdrževanje in pregledovanje LPS .37
7.1 Splošno.37
7.2 Izvajanje pregledov.37
7.3 Vrste pregledov .38
7.4 Vzdrževanje.38
8 Ukrepi za zaščito pred poškodbami živih bitij zaradi napetosti dotika in koraka.38
8.1 Ukrepi za zaščito pred napetostjo dotika.38
8.2 Ukrepi za zaščito pred napetostjo koraka .38
Dodatek A (normativni): Nameščanje lovilnega sistema.40
Dodatek B (normativni): Najmanjši prerez kabelskega zaslona vstopajočega kabla za preprečitev
nevarnega iskrenja.45
Dodatek C (informativni): Določitev ločilne razdalje s .46
Dodatek D (informativni): Dodatne informacije za LPS za zgradbe s tveganjem eksplozije .52
Dodatek E (informativni): Smernice za načrtovanje, namestitev, vzdrževanje in pregledovanje
sistemov za zaščito pred delovanjem strele .59

Slika 1: Zaščitni kot glede na vrsto LPS.21
Slika 2: Zanka v odvodu .25
2

---------------------- Page: 6 ----------------------

SIST EN 62305-3 : 2011
Slika 3: Najmanjša dolžina l vsakega ozemljila glede na vrsto LPS.27
1
Slika A.1: Prostor, ščiten z navpično lovilno palico .40
Slika A.2: Prostor, ščiten z navpično lovilno palico .41
Slika A.3: Prostor, ščiten z lovilno vrvjo.41
Slika A.4: Prostor, ščiten z izoliranimi vrvmi, povezanimi v mrežo, skladno z metodo
zaščitnega kota in metodo kotaleče krogle .42
Slika A.5: Prostor, ščiten z neizoliranimi vrvmi, povezanimi v mrežo, skladno z metodo
mreže in metodo zaščitnega kota .43
Slika A.6: Načrt lovilnega sistema po metodi kotaleče krogle.44
Slika C.1: Vrednosti koeficienta k pri lovilnem sistemu iz vrvi.46
c
Slika C.2: Vrednosti koeficienta k pri odvodnem sistemu z več odvodi .47
c
Slika C.3: Vrednosti koeficienta k pri poševni strehi z lovilniki na slemenu .49
c
Slika C.4: Primeri izračunavanja ločilne razdalje pri več odvodih in
medsebojno povezanem obroču odvodov na vsakem nivoju .50
Slika C.5: Vrednosti koeficienta k pri mrežnem lovilnem sistemu z odvodnim sistemom
c
z več odvodi .51
Slika E.1: Diagram poteka načrtovanja LPS .60
Slika E.2: Načrtovanje LPS pri zgradbah z napuščem.65
Slika E.3: Meritev celotne upornosti.66
Slika E.4: Primer izenačitve potencialov v zgradbi z jekleno armaturo.68
Slika E.5: Tipične metode za povezavo armaturnih palic v betonu (kjer je dovoljeno) .69
Slika E.6: Primer spojk, ki se uporabljajo kot spoji med armaturnimi palicami in vodniki .70
Slika E.7: Primeri povezovalnih točk na armaturo v armiranobetonski steni .71
Slika E.8: Uporaba kovinske fasade kot pomožni odvodni sistem in povezava fasadnih nosilcev.75
Slika E.9: Povezovanje neprekinjenih oken na kovinsko fasadno prekritje .76
Slika E.10: Notranji odvodi v industrijskih zgradbah .78
Slika E.11: Namestitev povezovalnih vodnikov v armiranobetonskih zgradbah in
pregibnih povezav med dvema armiranobetonskima deloma .80
Slika E.12: Načrtovanje lovilnika po metodi zaščitnega kota za različne višine
glede na preglednico 2.83
Slika E.13: Izolirani zunanji LPS z uporabljenima dvema izoliranima lovilnima stebroma,
načrtovan po načrtovalni metodi zaščitnega kota.84
Slika E.14: Izolirani zunanji LPS, sestavljen iz dveh izoliranih lovilnih stebrov, med seboj
povezanih z vodoravno obešeno vrvjo.85
Slika E.15: Primer načrtovanja lovilnika neizoliranega LPS z lovilnimi palicami.86
Slika E.16: Primer načrtovanja lovilnika neizoliranega LPS z vodoravnim vodnikom
skladno z načrtovalno metodo zaščitnega kota .87
Slika E.17: Ščiteni prostor lovilne palice na poševni površini z uporabo načrtovalne metode
zaščitnega kota .88
Slika E.18: Načrtovanje mreže lovilnikov LPS na zgradbi z zapleteno obliko.89
Slika E.19: Načrtovanje lovilnika LPS skladno z metodo zaščitnega kota in metodo zanke ter
splošna razporeditev lovilnih sestavnih delov .90
Slika E.20: Prostor, ščiten z dvema vzporednima vodoravnima lovilnima vrvema
ali dvema lovilnima palicama (r > h ) .91
t
3

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SIST EN 62305-3 : 2011
Slika E.21: Trije primeri načrtovanja lovilnika neizoliranega LPS z uporabo
načrtovalne metode mreže.94
Slika E.22: Štirje primeri detajlov LPS na zgradbi s poševno streho z opečno kritino.96
Slika E.23: Lovilni in vizualno nevidni vodniki za stavbe, nižje od 20 m in s poševno streho.97
Slika E.24: Namestitev LPS z uporabo pomožnih sestavnih delov na strehi zgradbe.98
Slika E.25: Namestitev zunanjega LPS na zgradbi iz izolacijskega materiala (npr. les, opeka),
visoki do 60 m, z ravno streho in s strešnimi pritiklinami .99
Slika E.26: Konstrukcija lovilnika na strehi s prevodnim prekritjem, kjer ni dovoljeno
preluknjanje prekritja . 100
Slika E.27: Namestitev zunanjega LPS na armiranobetonsko zgradbo, kjer je armatura
zunanjih sten uporabljena kot pomožni sestavni del. 101
Slika E.28: Primer lovilne gobice na strehi garažne hiše . 102
Slika E.29: Uporaba lovilne palice za zaščito kovinskih pritiklin na strehi z električnimi
napajalnimi inštalacijami, ki niso povezane z lovilnim sistemom . 103
Slika E.30: Metoda za doseganje električne prevodnosti na kovinski prekrivni oblogi . 104
Slika E.31: Kovinska strešna pritiklina, zaščitena pred direktnim udarom strele in povezana
z lovilnim sistemom . 107
Slika E.32: Primer zaščite pred delovanjem strele na zgradbi s TV anteno . 110
Slika E.33: Namestitev strelovodne zaščite pred direktnim udarom strele za kovinsko opremo
na strehi. 111
Slika E.34: Povezovanje pomožne lovilne palice z lovilniki. 113
Slika E.35: Povezovanje med segmenti kovinskih fasadnih plošč. 114
Slika E.36: Namestitev zunanjega LPS na zgradbi iz izolacijskega materiala in
z različnimi nivoji strehe . 116
Slika E.37: Pet primerov geometrije vodnikov LPS. 117
Slika E.38: Konstrukcija LPS ob uporabi samo dveh odvodov in temeljskega ozemljila . 118
Slika E.39: Štirje primeri povezovanja ozemljila na LPS zgradbe s pomožnimi odvodi (nosilci)
in detajl preskusnega spoja. 122
Slika E.40: Konstrukcija temeljskega obročastega ozemljila pri zgradbah z različno
načrtovanimi temelji. 126
Slika E.41: Dva primera navpičnih ozemljil pri razporeditvi ozemljil tipa A . 128
Slika E.42: Mrežni ozemljitveni sistem industrijskega kompleksa. 131
Slika E.43: Primeri izenačitve potencialov. 137
Slika E.44: Primer razporeditve povezav v zgradbi z več vhodnimi mesti zunanjih prevodnih
delov z uporabo obročastega ozemljila za medsebojno povezavo zbiralk . 139
Slika E.45: Primer povezovanja pri več vhodnih mestih zunanjih prevodnih delov in električne
napajalne ali komunikacijske napeljave z uporabo notranjega obročastega vodnika za
medsebojno povezavo zbiralk . 140
Slika E.46: Primer razporeditve povezav v zgradbi z več vhodnimi mesti zunanjih prevodnih delov,
ki vstopajo v zgradbo nad zemljo. 141
Slika E.47: Napotki za izračun ločilne razdalje s za najslabši primer točke udara strele
pri razdalji l od referenčne točke glede na točko 6.3. 143

4

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SIST EN 62305-3 : 2011
Preglednica 1: Odnos med zaščitnimi nivoji (LPL) in vrstami LPS (glej IEC 62305-1) .18
Preglednica 2: Največje vrednosti polmera kotaleče krogle, velikosti mreže in zaščitnega kota
glede na vrsto LPS.21
Preglednica 3: Najmanjša debelina kovinskih kritin ali kovinskih cevi v lovilnih sistemih .23
Preglednica 4: Značilne priporočljive razdalje med odvodi glede na vrsto LPS.24
Preglednica 5: Materiali LPS in pogoji uporabe .29
Preglednica 6: Material, oblika in najmanjši prerez lovilnikov, lovilnih palic, paličnih ozemljil
in odvodov.31
Preglednica 7: Material, oblika in najmanjše mere ozemljil.32
Preglednica 8: Najmanjše mere vodnikov, ki povezujejo različne zbiralke za izenačitev potencialov
ali povezujejo zbiralke za izenačitev potencialov na ozemljitveni sistem .34
Preglednica 9: Najmanjše mere vodnikov, ki povezujejo notranje kovinske inštalacije na zbiralke
za izenačitev potencialov .34
Preglednica 10: Izolacija zunanjega LPS – vrednosti koeficienta k .36
i
Preglednica 11: Izolacija zunanjega LPS – vrednosti koeficienta k .36
m
Preglednica 12: Izolacija zunanjega LPS – približne vrednosti koeficienta k .37
c
Preglednica B.1: Dolžina kabla, ki se upošteva glede na stanje zaslona .45
Preglednica E.1: Predlagana mesta pritrditev.95
Preglednica E.2: Najdaljše obdobje med pregledi LPS. 145
5

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SIST EN 62305-3 : 2011
Predgovor k evropskemu standardu
Besedilo mednarodnega standarda IEC 62305-3:2010, ki ga je pripravil tehnični odbor IEC/TC 81
Strelovodna zaščita, skupaj s skupnimi spremembami, ki jih je pripravil tehnični odbor CENELEC/TC
81X Strelovodna zaščita, je bilo dano na glasovanje in ga je CENELEC 2. januarja 2011 sprejel kot
EN 62305-3.

Ta evropski standard nadomešča EN 62305-3:2006 + popr. nov. 2006 + popr. sep. 2008 + A11:2009.

Standard 62305-3:2011 vključuje naslednje bistvene tehnične spremembe glede na EN 62305-3:2006
+ popr. nov. 2006 + popr. sep. 2008 + A11:2009:
1) Najmanjše debeline kovinskih plošč ali kovinskih cevi za lovilne sisteme v preglednici 3 ne morejo
preprečiti toplotnih poškodb.
2) Z bakrom galvanizirano jeklo je primerno kot material za LPS.
3) Nekateri prerezi vodnikov LPS so bili nekoliko spremenjeni.
4) Za izenačitev potencialov se pri kovinskih inštalacijah uporabljajo iskrišča, pri notranjih sistemih
pa SPD.
5) Za ovrednotenje ločilne razdalje se lahko uporabita dve metodi – poenostavljena in zahtevnejša.
6) Ukrepi za zaščito pred poškodbami živih bitij zaradi električnega udara so obravnavani tudi za
notranjost zgradbe.
7) Dodatne informacije za LPS pri zgradbah, kjer obstaja tveganje eksplozije, so podane v dodatku
D (normativni).

Opozarjamo na možnost, da bi lahko bil kateri od elementov tega standarda predmet patentnih pravic.
CEN in CENELEC ne odgovarjata za identifikacijo nobene od teh patentnih pravic.
Določena sta bila naslednja datuma:
– zadnji datum, do katerega mora EN dobiti status
nacionalnega standarda bodisi z objavo istovetnega besedila
ali z razglasitvijo                                                    (dop) 2012-01-02
– zadnji datum, ko je treba razveljaviti nacionalne standarde,
ki so z EN v nasprotju (dow) 2014-01-02




Razglasitvena objava

Besedilo mednarodnega standarda IEC 62305-3:2010 je CENELEC odobril kot evropski standard s
sprejetimi skupnimi spremembami, kot so navedene spodaj.

V uradni verziji je treba v Literaturi dodati naslednjo opombo za navedeni standard:

[2] IEC 61400-24 OPOMBA: Harmoniziran kot EN 61400-24

6

---------------------- Page: 10 ----------------------

SIST EN 62305-3 : 2011
SKUPNE SPREMEMBE
V celotnem dokumentu:

Zamenjajo se vsa sklicevanja na IEC 62305 s sklicevanji na EN 62305.

Zamenjajo se vsa sklicevanja na IEC 62561 s sklicevanji na EN 50164.

2 Zveze s standardi

To točka se zamenja z:

Spodaj navedeni standardi so nujno potrebni pri uporabi tega dokumenta. Pri datiranem sklicevanju se
upoštevajo samo navedene izdaje. Pri nedatiranem sklicevanju se upoštevajo zadnje izdaje navedenih
dokumentov (vključno s popravki in dopolnili).

EN 50164-1 Elementi za zaščito pred strelo (LPC) – 1. del: Zahteve za povezovalne
elemente
EN 50164-2 Elementi za zaščito pred strelo (LPC) – 2. del: Zahteve za vodnike in
ozemljila
EN 50164-3 Elementi za zaščito pred strelo (LPC) – 3. del: Zahteve za iskrišča
EN 50164-4 Elementi za zaščito pred strelo (LPC) – 4. del: Zahteve za pritrdilne
elemente
EN 50164-5 Elementi za zaščito pred strelo (LPC) – 5. del: Zahteve za merilne
omarice ozemljil in tesnjenje izolacije pri ozemljilih
EN 50164-6 Elementi za zaščito pred strelo (LPC) – 6. del: Zahteve za števce udarov
strele
EN 50164-7 Elementi za zaščito pred strelo (LPC) - 7. del: Zahteve za spojine, ki
izboljšajo ozemljitev
OPOMBA: Zgoraj navedeni standardi skupine 50164 bodo na koncu zamenjani s skupino EN 62561. Skupina standardov
EN 50164 bo še vedno v veljavi 72 mesecev po izdaji posameznega standarda iz skupine EN 50164.

EN 60079-10-1:2009 Eksplozivne atmosfere – 10-1. del: Razvrstitev prostorov – Eksplozivne
plinske atmosfere (IEC 60079-10-1:2008)
EN 60079-10-2:2009 Eksplozivne atmosfere – 10-2. del: Razvrstitev prostorov – Eks
...

SLOVENSKI STANDARD
oSIST FprEN 62305-3:2009
01-december-2009
=DãþLWDSUHGGHORYDQMHPVWUHOHGHO)L]LþQDãNRGDQD]JUDGEDKLQQHYDUQRVW]D
åLYDELWMD
Protection against lightning -- Part 3: Physical damages to structures and life hazard
Protection contre la foudre -- Partie 3: Dommages physiques sur les structures et risques
humains
Ta slovenski standard je istoveten z: FprEN 62305-3:2009
ICS:
29.020 Elektrotehnika na splošno Electrical engineering in
general
91.120.40 =DãþLWDSUHGVWUHOR Lightning protection
oSIST FprEN 62305-3:2009 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST FprEN 62305-3:2009

---------------------- Page: 2 ----------------------
oSIST FprEN 62305-3:2009

81/337/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
®
PROJET DE COMITÉ POUR VOTE (CDV)
Project number IEC 62305-3 Ed.2
Numéro de projet
IEC/TC or SC: Secretariat / Secrétariat
81
Italy
CEI/CE ou SC:

Date of circulation Closing date for voting (Voting
Submitted for parallel voting in
Date de diffusion mandatory for P-members)
CENELEC
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Also of interest to the following committees Supersedes document
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Titre : Protection contre la foudre - Partie 3: Title : Protection against lightning - Part 3:
Dommages physiques sur les structures et Physical damages to structures and life hazard
risques humains




Note d'introduction Introductory note
This CDV is circulated in English only in the absence

of a French version from the French national
committee within two months from date of request.


ATTENTION ATTENTION
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Copyright © 2009 International Electrotechnical Commission, IEC. All rights reserved. It is
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FORM CDV (IEC)
® Registered trademark of the International Electrotechnical Commission
2009-01-09

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IEC 62305-3, Ed.2: Protection against lightning –

Part 3: Physical damage to structures and life hazard

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CONTENTS
FOREWORD. 5
INTRODUCTION. 7

1 Scope. 8
2 Normative references . 8
3 Terms and definitions. 9
4 Lightning protection system (LPS). 12
4.1 Class of LPS. 12
4.2 Design of the LPS . 13
4.3 Continuity of steelwork in reinforced concrete structures . 13
5 External lightning protection system. 13
5.1 General . 13
5.2 Air-termination systems . 14
5.3 Down-conductor systems. 17
5.4 Earth-termination system. 20
5.5 Components . 22
5.6 Materials and dimensions . 24
6 Internal lightning protection system. 26
6.1 General . 26
6.2 Lightning equipotential bonding. 26
6.3 Electrical insulation of the external LPS. 29
7 Maintenance and inspection of an LPS. 29
7.1 Application of inspections . 30
7.2 Order of inspections . 30
7.3 Maintenance . 31
8 Protection measures against injury to living beings due to touch and step voltages . 31
8.1 Protection measures against touch voltages . 31
8.2 Protection measures against step voltages . 31

Annex A (normative) Positioning the air-termination system . 33
Annex B (normative) Minimum cross-section of the entering cable screen in order to avoid
dangerous sparking. 39
Annex C (informative) Evaluation of the separation distance s………………………         40
Annex D (normative) Additional information for LPS in the case of structures with a risk of
explosion. 47
Annex E (informative) Guidelines for the design, construction, maintenance and inspection
of lightning protection systems. 50

Bibliography.

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Table 1 – Relation between lightning protection levels (LPL) and class of LPS (see
IEC 62305-1) . 12
Table 2 – Maximum values of rolling sphere radius, mesh size and protection angle
corresponding to the class of LPS. 15
Table 3 – Minimum thickness of metal sheets or metal pipes in air-termination systems. 17
Table 4 – Typical values of the distance between down-conductors according to the class of
LPS. 18
Table 5 – LPS materials and conditions of use . 23
Table 6 – Material, configuration and minimum cross-sectional area of air-termination
conductors, air-termination rods, earth lead-in rods and down conductors. 24
Table 7 – Material, configuration and minimum dimensions of earth electrodes . 25
Table 8 – Minimum dimensions of conductors connecting different bonding bars or
connecting bonding bars to the earth-termination system . 27
Table 9 – Minimum dimensions of conductors connecting internal metal installations to the
bonding bar .27
Table 10 – Isolation of external LPS – Values of coefficient k .
i
Table 11 – Isolation of external LPS – Values of coefficient k .
m
Table 12 – Isolation of external LPS – Approximated values of coefficient k .
c

Figure 1 – Loop in a down-conductor………………………………………………………………….18
Figure 2 – Minimum length l of each earth electrode according to the class of LPS………….20
1

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________

PROTECTION AGAINST LIGHTNING –

Part 3: Physical damage to structures and life hazard


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all
national electrotechnical committees (IEC national committees). The object of the IEC is to promote international
cooperation on all questions concerning standardization in the electrical and electronic fields. To this end and in
addition to other activities, the IEC publishes international standards, technical specifications, technical reports,
publicly available specifications (PAS) and guides (hereafter referred to as “IEC publication(s)”). Their preparation is
entrusted to technical committees; any IEC national committee interested in the subject dealt with may participate in
this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also
participate in this preparation. The IEC collaborates closely with the International Organization for Standardization
(ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all interested
IEC national committees.
3) IEC publications have the form of recommendations for international use and are accepted by IEC national committees
in that sense. While all reasonable efforts are made to ensure that the technical content of IEC publications is
accurate, the IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any
end user.
4) In order to promote international uniformity, IEC national committees undertake to apply IEC publications transparently
to the maximum extent possible in their national and regional publications. Any divergence between any IEC
publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment
declared to be in conformity with an IEC publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to the IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC national committees for any personal injury, property damage or other
damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising
out of the publication, use of, or reliance upon, this IEC publication or any other IEC publications.
8) Attention is drawn to the normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC publication may be the subject of patent
rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International standard IEC 62305-3 has been prepared by IEC technical committee 81: Lightning
protection.
The text of this second edition of IEC 62305-3 is compiled from and replaces IEC 62305-3, first
edition (2006).
The text of this standard is based on the following documents:
FDIS Report on voting
81/xxx/FDIS 81/xxx/RVD

Full information on the voting for the approval of this standard can be found in the report on voting
indicated in the above Table.
This publication has been drafted, as close as possible, in accordance with the ISO/IEC Directives,
Part 2.
IEC 62305 consists of the following parts, under the general title Protection against lightning:
Part 1: General principles
Part 2: Risk management

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Part 3: Physical damage to structures and life hazard
Part 4: Electrical and electronic systems within structures
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result date indicated on the IEC website "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be:
• reconfirmed;
• withdrawn;
• replaced by a revised edition; or
• amended.

In the United States, based on the requirements of NFPA 780: Standard for the Installation of Lightning Protection
Systems 2008 Edition and practical experience in the use of horizontal earth electrodes, the minimum length of horizontal
earth electrodes is not required to be twice that required for vertical electrodes.
In France, Portugal and Spain:
– natural components cannot substitute as lightning protection components but may be used to complete/enhance the
LPS;
– aluminium solid round diameters should be extended from 8 mm to 10 mm;
– stranded conductors cannot be used as down-conductors;
– diameter of solid round conductors should be extended from 16 mm to 18 mm;
– hot dip galvanized steel solid tape thickness should be extended from 2 mm to 3,5 mm.

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INTRODUCTION
This part of IEC 62305 deals with the protection, in and around a structure, against physical
damage and injury to living beings due to touch and step voltages.
The main and most effective measure for protection of structures against physical damage is
considered to be the lightning protection system (LPS). It usually consists of both external and
internal lightning protection systems.
An external LPS is intended to:
a) intercept a lightning flash to the structure (with an air-termination system);
b) conduct the lightning current safely towards earth (using a down-conductor system);
c) disperse the lightning current into the earth (using an earth-termination system).
An internal LPS prevents dangerous sparking within the structure using either equipotential bonding
or a separation distance (and hence electrical insulation) between the external LPS (as defined in
3.2) components and other electrically conducting elements internal to the structure.
Main protection measures against injury to living beings due to touch and step voltages are
intended to:
1) reduce the dangerous current flowing through bodies by insulating exposed conductive
parts, and/or by increasing the surface soil resistivity;
2) reduce the occurrence of dangerous touch and step voltages by physical restrictions and/or
warning notices.
The type and location of an LPS should be carefully considered in the initial design of a new
structure, thereby enabling maximum advantage to be taken of the electrically conductive parts of
the structure. By doing so, design and construction of an integrated installation is made easier, the
overall aesthetic aspects can be improved, and the effectiveness of the LPS can be increased at
minimum cost and effort.
Access to the ground and the proper use of foundation steelwork for the purpose of forming an
effective earth-termination may well be impossible once construction work on a site has
commenced. Therefore, soil resistivity and the nature of the earth should be considered at the
earliest possible stage of a project. This information is fundamental to the design of an earth-
termination system and may influence the foundation design work for the structure.
Regular consultation between LPS designers and installers, architects and builders is essential in
order to achieve the best result at minimum cost.
If lightning protection is to be added to an existing structure, every effort should be made to ensure
that it conforms to the principles of this standard. The design of the type and location of an LPS
should take into account the features of the existing structure.

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PROTECTION AGAINST LIGHTNING

Part 3: Physical damage to structures and life hazard



1 Scope
This part of IEC 62305 provides the requirements for protection of a structure against physical
damage by means of a lightning protection system (LPS), and for protection against injury to living
beings due to touch and step voltages in the vicinity of an LPS (see IEC 62305-1).
This standard is applicable to:
a) design, installation, inspection and maintenance of an LPS for structures without limitation of
their height;
b) establishment of measures for protection against injury to living beings due to touch and step
voltages.
NOTE 1 Specific requirements for an LPS in structures dangerous to their surroundings due to the risk of explosion are under
consideration. Additional information is provided in Annex D for use in the interim.
NOTE 2 This part of IEC 62305 is not intended to provide protection against failures of electrical and electronic systems
due to overvoltages. Specific requirements for such cases are provided in IEC 62305-4.
NOTE 3  Specific requirements for protection against lightning of wind turbines are reported in IEC TR 61400-24: 2002,
Wind turbine generator systems – Part 24: Lightning.

2 Normative references
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.
IEC 60079-10:2002, Electrical apparatus for explosive gas atmospheres – Part 10: Classification of
hazardous areas
IEC 60079-14:2002, Electrical apparatus for explosive gas atmospheres – Part 14: Electrical
installations in hazardous areas (other than mines)
IEC 61241-10:2004, Electrical apparatus for use in the presence of combustible dust – Part 10:
Classification of areas where combustible dusts are or may be present
IEC 61241-14:2004, Electrical apparatus for use in the presence of combustible dust – Part 14:
Selection and installation
IEC 61643-12:2002, Low-voltage surge protective devices – Part 12: Surge protective devices
connected to low voltage power distribution systems – Selection and application principles
IEC 62305-1, Protection against lightning – Part 1: General principles
IEC 62305-2, Protection against lightning – Part 2: Risk management
IEC 62305-4, Protection against lightning – Part 4: Electrical and electronic systems within
structures
1
IEC 62561-1 , Lightning Protection System Components (LPSC) – Part 1: Requirements for
connection components.


1
In preparation

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1
IEC 62561-2 Lightning Protection System Components (LPSC) – Part 2: Requirements for
conductors and earth rods.

1
IEC 62561-3 , Lightning Protection System Components (LPSC) – Part 3: Requirements for
isolating spark gaps.

IEC TR 61400-24: 2002, Wind turbine generator systems – Part 24: Lightning protection
IEC 61400-1: 2005, Wind turbines – Part 1 : Design requirements
ISO 3864-1, Graphical symbols – Safety colours and safety signs – Part 1: Design principles for
safety signs in workplaces and public areas
EN TR 50469: 2005, Lightning protection system – Symbols
EN 13501:2007, Fire classification of construction products and buildings elements
3 Terms and definitions
For the purposes of this document, the following terms and definitions, some of which have already
been cited in Part 1 but are repeated here for ease of reference, as well as those given in other
parts of IEC 62305, apply.
3.1
lightning protection system
LPS
complete system used to reduce physical damage due to lightning flashes to a structure
NOTE It consists of both external and internal lightning protection systems.
3.2
external lightning protection system
part of the LPS consisting of an air-termination system, a down-conductor system and an earth-
termination system
3.3
external LPS isolated from the structure to be protected
LPS with an air-termination system and down-conductor system positioned in such a way that the
path of the lightning current has no contact with the structure to be protected
NOTE In an isolated LPS, dangerous sparks between the LPS and the structure are avoided.
3.4
external LPS not isolated from the structure to be protected
LPS with an air-termination system and down-conductor system positioned in such a way that the
path of the lightning current can be in contact with the structure to be protected
3.5
internal lightning protection system
part of the LPS consisting of lightning equipotential bonding and/or electrical insulation of external
LPS
3.6
air-termination system
part of an external LPS using metallic elements such as rods, mesh conductors or catenary wires
intended to intercept lightning flashes
3.7
down-conductor system
part of an external LPS intended to conduct lightning current between the air-termination system
and the earth-termination system

1
In preparation

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3.8
ring conductor
conductor forming a loop around the structure and interconnecting the down-conductors for
distribution of lightning current among them
3.9
earth-termination system
part of an external LPS which is intended to conduct and disperse lightning current into the earth
3.10
earth electrode
part or a group of parts of the earth-termination system which provides direct electrical contact with
the earth and disperses lightning current to the earth
3.11
ring earth electrode
earth electrode forming a closed loop around the structure below or on the surface of the earth
3.12
foundation earth electrode
conductive part buried in the soil under a building foundation or, preferably, embedded in concrete
of a building foundation, generally in form of a closed loop
[IEV 826-13-08]
3.13
conventional earth impedance
ratio of the peak values of the earth-termination voltage and the earth-termination current which, in
general, do not occur simultaneously
3.14
earth-termination voltage
potential difference between the earth-termination system and the remote earth
3.15
natural component of LPS
conductive component installed not specifically for lightning protection which can be used in
addition to the LPS or in some cases could provide the function of one or more parts of the LPS
NOTE Examples of the use of this term include:
– natural air-termination;
– natural down-conductor;
– natural earth electrode.
3.16
connecting component
part of an LPS which is used for the connection of conductors to each other or to metallic
installations.
NOTE This also includes bridging component and expansion piece.
3.17
fixing component
part of an LPS which is used to fix the elements of the LPS to the structure to be protected,
3.18
metal installations
extended metal items in the structure to be protected which may form a path for lightning current,
such as pipework, staircases, elevator guide rails, ventilation, heating and air-conditioning ducts,
and interconnected reinforcing steel, structural metal parts.

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3.19
external conductive parts
extended metal items entering or leaving the structure to be protected such as pipework, metallic
cable elements, metal ducts, etc. which may carry a part of the lightning current
3.20
electrical system
system incorporating low voltage power supply components and possibly electronic components
3.21
electronic system
system incorporating sensitive electronic components such as telecommunication equipment,
computer, control and instrumentation systems, radio systems, power electronic installations
3.22
internal systems
electrical and electronic systems within a structure
3.23
lightning equipotential bonding
EB
bonding to the LPS of separated conductive parts, by direct connections or via surge protective
devices, to reduce potential differences caused by lightning current
3.24
bonding bar
metal bar on which metal installations, external conductive parts, electric power and tele-
communication lines, and other cables can be bonded to an LPS
3.25
bonding conductor
conductor connecting separated conductive parts to LPS
3.26
interconnected reinforcing steel
steelwork within a concrete structure which is considered electrically continuous
3.27
dangerous sparking
electrical discharge due to lightning which causes physical damage in the structure to be protected
3.28
separation distance
distance between two conductive parts at which no dangerous sparking can occur
3.29
surge protective device
SPD
device that is intended to limit transient overvoltages and divert surge currents. It contains at least
one non-linear component
3.30
test joint
joint designed to facilitate electrical testing and measurement of LPS components
3.31
class of LPS
number denoting the classification of an LPS according to the lightning protection level for which it
is designed
3.32
lightning protection designer
specialist competent and skilled in the design of the LPS

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3.33
lightning protection installer
person competent and skilled in the installation of the LPS
3.34
structures with risk of explosion
structures containing solid explosive materials or hazardous areas as determined in accordance
with IEC 60079-10 and IEC 61241-10
3.35
Isolating Spark Gap (ISG)
component with discharge distance for isolating electrically conductive installation sections
NOTE In the event of a lightning strike, the installation sections are temporary connected conductively as the result of
response of the discharge.
3.36
Isolating interfaces
devices which are capable of reducing conducted surges on lines entering the LPZ. These include:
isolation transformers with earthed screen between windings, metal free fibre optic cables and opto-
isolators
NOTE Insulation withstand characteristics of these devices shall be suitable for this application.

4 Lightning protection system (LPS)
4.1 Class of LPS
The characteristics of an LPS are determined by the characteristics of the structure to be protected
and by the c
...

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