IEC 62305-3:2010
(Main)Protection against lightning - Part 3: Physical damage to structures and life hazard
Protection against lightning - Part 3: Physical damage to structures and life hazard
IEC 62305-3:2010 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 second edition cancels and replaces the first edition, published in 2006, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
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).
This bilingual version (2012-06) corresponds to the monolingual English version, published in 2010-12.
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.
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IEC 62305-3 ®
Edition 2.0 2010-12
INTERNATIONAL
STANDARD
colour
inside
Protection against lightning –
Part 3: Physical damage to structures and life hazard
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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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
– 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
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
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
– 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 .
...
IEC 62305-3 ®
Edition 2.0 2010-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
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International Standards for all electrical, electronic and related technologies.
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IEC 62305-3 ®
Edition 2.0 2010-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
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
CODE PRIX XG
ICS 29.020; 91.120.40 ISBN 978-2-83220-129-9
– 2 – 62305-3 IEC:2010
CONTENTS
FOREWORD . 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 . 28
5.6.1 Materials . 28
5.6.2 Dimensions . 28
6 Internal lightning protection system . 30
6.1 General . 30
6.2 Lightning equipotential bonding . 31
6.2.1 General . 31
6.2.2 Lightning equipotential bonding for metal installations . 31
6.2.3 Lightning equipotential bonding for external conductive parts . 32
6.2.4 Lightning equipotential bonding for internal systems . 33
62305-3 IEC:2010 – 3 –
6.2.5 Lightning equipotential bonding for lines connected to the structure to
be protected . 33
6.3 Electrical insulation of the external LPS . 34
6.3.1 General . 34
6.3.2 Simplified approach . 35
6.3.3 Detailed approach . 35
7 Maintenance and inspection of an LPS . 35
7.1 General . 35
7.2 Application of inspections . 36
7.3 Order of inspections . 36
7.4 Maintenance . 36
8 Protection measures against injury to living beings due to touch and step voltages . 36
8.1 Protection measures against touch voltages . 36
8.2 Protection measures against step voltages . 37
Annex A (normative) Positioning the air-termination system . 38
Annex B (normative) Minimum cross-section of the entering cable screen in order to
avoid dangerous sparking . 43
Annex C (informative) Evaluation of the separation distance s . 44
Annex D (normative) Additional information for LPS in the case of structures with a
risk of explosion . 50
Annex E (informative) Guidelines for the design, construction, maintenance and
inspection of lightning protection systems . 57
Bibliography . 154
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
Figure A.1 – Volume protected by a vertical air-termination rod . 38
Figure A.2 – Volume protected by a vertical air-termination rod . 39
Figure A.3 – Volume protected by a wire air-termination system . 39
Figure A.4 – Volume protected by isolated wires combined in a mesh according to the
protection angle method and rolling sphere method . 40
Figure A.5 – Volume protected by non-isolated wires combined in a mesh according to
the mesh method and the protection angle method . 41
Figure A.6 – Design of an air-termination system according to the rolling sphere
...
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