SIST EN IEC 62305-4:2024

SLOVENSKI STANDARD
01-december-2024
Nadomešča:
SIST EN 62305-4:2011
SIST EN 62305-4:2011/AC:2016
Zaščita pred delovanjem strele - 4. del: Električni in elektronski sistemi v zgradbah
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 IEC 62305-4:2024
ICS:
91.120.40 Zaščita pred strelo Lightning protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 62305-4

NORME EUROPÉENNE
EUROPÄISCHE NORM October 2024
ICS 29.020; 91.120.40 Supersedes EN 62305-4:2011; EN 62305-
4:2011/AC:2016-11
English Version
Protection against lightning - Part 4: Electrical and electronic
systems within structures
(IEC 62305-4:2024)
Protection contre la foudre - Partie 4: Réseaux de Blitzschutz - Teil 4: Elektrische und elektronische Systeme
puissance et de communication dans les structures in baulichen Anlagen
(IEC 62305-4:2024) (IEC 62305-4:2024)
This European Standard was approved by CENELEC on 2024-10-17. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62305-4:2024 E

European foreword
The text of document 81/733/FDIS, future edition 3 of IEC 62305-4, prepared by TC 81 "Lightning
protection" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-10-31
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-10-31
document have to be withdrawn
This document supersedes EN 62305-4:2011 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 62305-4:2024 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 standard indicated:
IEC 60364-4-43 NOTE Approved as HD 60364-4-43
IEC 60364-4-44:2007 NOTE Approved as HD 60364-4-444:2010
IEC 60364-4-44:2007/A1:2015 NOTE Approved as HD 60364-4-443:2016
IEC 61000 series NOTE Approved as EN IEC 61000 series
IEC 62475 NOTE Approved as EN 62475
IEC 60060 series NOTE Approved as EN 60060 series
IEC 62793 NOTE Approved as EN IEC 62793
IEC 60038 NOTE Approved as EN 60038
IEC 61643-351 NOTE Approved as EN 61643-351
IEC 61643-352 NOTE Approved as EN IEC 61643-352
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60364-5-53 2019 Low-voltage electrical installations -- Part - -
5-53: Selection and erection of electrical
equipment - Protection, isolation,
switching, control and monitoring
IEC 60664-1 - Insulation coordination for equipment EN IEC 60664-1 -
within low-voltage supply systems - Part 1:
Principles, requirements and tests
IEC 61000-4-5 - Electromagnetic compatibility (EMC) - Part EN 61000-4-5 -
4-5: Testing and measurement techniques
- Surge immunity test
IEC 61000-4-9 - Electromagnetic compatibility (EMC) – Part EN 61000-4-9 -
4-9: Testing and measurement techniques
– Impulse magnetic field immunity test
IEC 61000-4-10 - Electromagnetic compatibility (EMC) – Part EN 61000-4-10 -
4-10: Testing and measurement
techniques – Damped oscillatory magnetic
field immunity test
IEC 61643-11 (mod) 2011 Low-voltage surge protective devices - Part EN 61643-11 2012
11: Surge protective devices connected to
low-voltage power systems - Requirements
and test methods
- - + A11 2018
IEC 61643-12 2020 Low-voltage surge protective devices - Part - -
12: Surge protective devices connected to
low-voltage power systems - Selection and
application principles
IEC 61643-21 - Low voltage surge protective devices - Part EN 61643-21 -
21: Surge protective devices connected to
telecommunications and signalling
networks - Performance requirements and
testing methods
Publication Year Title EN/HD Year
IEC 61643-22 - Low-voltage surge protective devices - Part CLC/TS 61643-22 -
22: Surge protective devices connected to
telecommunications and signalling
networks - Selection and application
principles
IEC 61643-31 - Low-voltage surge protective devices – EN 61643-31 -
Part 31: Requirements and test methods
for SPDs for photovoltaic installations
IEC 61643-32 2017 Low-voltage surge protective devices – - -
Part 32: Surge protective devices
connected to the d.c. side of photovoltaic
installations – Selection and application
principles
IEC 62305-1 2024 Protection against lightning - Part 1: EN IEC 62305-1 2024
General principles
IEC 62305-2 2024 Protection against lightning - Part 2: Risk EN IEC 62305-2 2024
management
IEC 62305-3 2024 Protection against lightning - Part 3: EN IEC 62305-3 2024
Physical damage to structures and life
hazard
IEC 62561 series Lightning protection system components EN IEC 62561 series
(LPSC) - Part 1: Requirements for
connection components
IEC 62305-4 ®
Edition 3.0 2024-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Protection against lightning –

Part 4: Electrical and electronic systems within structures

Protection contre la foudre –
Partie 4: Réseaux de puissance et de communication dans les structures

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.020, 91.120.40 ISBN 978-2-8322-7933-5

– 2 – IEC 62305-4:2024 © IEC 2024
CONTENTS
FOREWORD . 8
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 11
3 Terms and definitions . 12
4 Design and installation of SPM . 16
4.1 General . 16
4.2 Design of SPM . 20
4.3 Lightning protection zones (LPZs) . 20
4.3.1 General . 20
4.3.2 Outer zones . 20
4.3.3 Inner zones . 21
4.4 Basic SPM . 23
5 Earthing and bonding networks . 24
5.1 General . 24
5.2 Earth-termination system . 25
5.3 Bonding network . 26
5.4 Bonding bars . 31
5.5 Bonding at the boundary of an LPZ . 32
5.6 Material and dimensions of bonding components . 32
6 Magnetic shielding and line routing . 33
6.1 General . 33
6.2 Spatial shielding . 33
6.3 Shielding of internal lines . 33
6.4 Routing of internal lines . 34
6.5 Shielding of external lines . 34
6.6 Material and dimensions of magnetic shields . 34
7 Coordinated SPD system . 34
8 Isolating interfaces . 35
9 SPM management . 35
9.1 General . 35
9.2 SPM management plan . 36
9.3 Inspection of SPM . 38
9.3.1 General . 38
9.3.2 Inspection procedure . 38
9.3.3 Inspection documentation . 39
9.4 Maintenance . 39
Annex A (informative) Basis of electromagnetic environment evaluation in an LPZ . 40
A.1 General . 40
A.2 Damaging effects on electrical and electronic systems due to lightning . 40
A.2.1 Sources of damage . 40
A.2.2 Object of damage . 40
A.2.3 Withstand of equipment signal ports . 40
A.2.4 Withstand of equipment power ports . 41
A.2.5 Relationship between the object of damage and the source of damage . 42
A.3 Spatial shielding, line routing and line shielding . 42

IEC 62305-4:2024 © IEC 2024 – 3 –
A.3.1 General . 42
A.3.2 Grid-like spatial shields . 45
A.3.3 Line routing and line shielding . 47
A.4 Magnetic field inside LPZ . 51
A.4.1 Approximation for the magnetic field inside LPZ . 51
A.4.2 Numerical magnetic field calculation in case of direct lightning strikes . 57
A.4.3 Experimental evaluation of the magnetic field due to a direct lightning
strike . 61
A.5 Calculation of induced voltages and currents . 62
A.5.1 General . 62
A.5.2 Situation inside LPZ 1 in the case of a direct lightning strike . 62
A.5.3 Situation inside LPZ 1 in the case of a nearby lightning strike . 65
A.5.4 Situation inside LPZ 2 and higher . 66
Annex B (informative) Implementation of SPM for an existing structure . 67
B.1 General . 67
B.2 Checklists . 67
B.3 Design of SPM for an existing structure . 68
B.4 Design of basic protection measures for LPZs . 70
B.4.1 Design of basic protection measures for LPZ 1 . 70
B.4.2 Design of basic protection measures for LPZ 2 . 70
B.4.3 Design of basic protection measures for LPZ 3 . 71
B.5 Improvement of an existing LPS using spatial shielding of LPZ 1 . 71
B.6 Establishment of LPZs for electrical and electronic systems . 71
B.7 Protection using a bonding network . 74
B.8 Protection by surge protective devices . 74
B.9 Protection by isolating interfaces . 75
B.10 Protection measures by line routing and shielding . 75
B.11 Protection measures for externally installed equipment . 77
B.11.1 General . 77
B.11.2 Protection of external equipment . 77
B.11.3 Protection by maintaining electrical insulation to the LPS . 79
B.11.4 Reduction of overvoltages in cables . 80
B.12 Improving interconnections between structures . 81
B.12.1 General . 81
B.12.2 Isolating lines . 81
B.12.3 Metallic lines . 81
B.13 Integration of new internal systems into existing structures . 81
B.14 Overview of possible protection measures . 82
B.14.1 Power supply . 82
B.14.2 Surge protective devices . 83
B.14.3 Isolating interfaces . 83
B.14.4 Line routing and shielding . 83
B.14.5 Spatial shielding . 83
B.14.6 Bonding . 83
B.15 Upgrading a power supply and cable installation inside the structure . 83
Annex C (informative) Selection and installation of a coordinated SPD system . 84
C.1 General . 84
C.2 Selection of SPDs . 85
C.2.1 Location of SPDs according to source of damage . 85

– 4 – IEC 62305-4:2024 © IEC 2024
C.2.2 Selection with regard to lightning current I . 86
C.2.3 Selection with regard to voltage protection level U . 87
p
C.2.4 SPD arrangements . 92
C.2.5 Equipment protection by two SPDs . 92
C.2.6 Equipment connected to two different services . 93
C.2.7 Selection with regard to location and discharge current . 93
C.2.8 Coordination of the SPD with back-up overcurrent protective device
(OCPD) . 96
C.3 Installation of a coordinated SPD system . 97
C.3.1 General . 97
C.3.2 Installation location of SPDs . 97
C.3.3 Connecting conductors . 98
C.3.4 Coordination of SPDs . 98
C.3.5 Procedure for installation of a coordinated SPD system . 98
Annex D (informative) Factors to be considered in the selection of SPDs . 99
D.1 General . 99
D.2 Factors determining the stress experienced by an SPD . 99
D.3 Quantifying the statistical threat level to an SPD . 101
D.3.1 General . 101
D.3.2 Installation factors effecting current distribution . 101
D.3.3 Considerations in the selection of SPD ratings: I , [I ], I , U . 102
imp max n OC
Annex E (informative) Lightning current sharing using simulation modelling . 104
E.1 General . 104
E.1.1 Overview . 104
E.1.2 Methods to determine the lightning current distribution . 104
E.2 Lightning current parameters for SPDs . 105
E.2.1 Lightning current parameters in accordance with IEC 62305-1 . 105
E.2.2 Conclusion on lightning current sharing from numerical modelling . 105
E.3 Distribution of lightning currents in power supply systems . 106
E.3.1 Influencing factors . 106
E.3.2 Considerations in lightning current sharing using numerical modelling . 108
E.4 Current distribution in structures . 111
E.4.1 General . 111
E.4.2 Structures with externally installed equipment and non-isolated LPS . 112
E.4.3 Tall buildings . 113
E.4.4 Transformer located inside a structure . 114
Annex F (informative) Lightning current sharing in photovoltaic installations . 115
F.1 General . 115
F.2 Structures with roof-mounted PV systems . 117
F.2.1 Description and assumptions . 117
F.2.2 Simplified calculation for the lightning current flowing in DC conductors . 117
F.3 Outside free-field power plant with a non-isolated LPS. 119
F.3.1 General . 119
F.3.2 Finding the lightning current flowing through the DC conductor via the
SPD . 120
F.3.3 Results . 120
Annex G (informative) Testing system level behaviour under lightning discharge

conditions . 122
G.1 General . 122

IEC 62305-4:2024 © IEC 2024 – 5 –
G.2 SPD discharge current test under normal service conditions . 122
G.3 Induction test due to lightning currents . 122
G.4 Recommended test classification of system level immunity (IEC 61000-4-5) . 122
Annex H (informative) Induced voltage in the circuits protected by an SPD . 124
H.1 General . 124
H.2 Direct flashes to the structure (Figure H.1) . 124
H.3 Flashes near the structure (Figure H.2) . 125
H.4 Flashes to the service . 126
Annex I (informative) Isolation interfaces using surge isolation transformers (SITs) . 128
I.1 SIT for low-voltage power distribution system . 128
I.2 SIT for communication systems . 128
I.3 SIT surge mitigation performance (low-voltage power distribution systems) . 128
Bibliography . 130

Figure 1 – General principle for the division into different LPZs . 17
Figure 2 – Examples of possible SPM (LEMP protection measures) . 19
Figure 3 – Examples of interconnected LPZs . 22
Figure 4 – Examples of extended lightning protection zones . 23
Figure 5 – Example of a three-dimensional earthing system consisting of the bonding

network interconnected with the earth-termination system . 25
Figure 6 – Meshed earth-termination system of a plant . 26
Figure 7 – Utilization of reinforcing rods of a structure as a protection measure against
LEMP and for equipotential bonding. 28
Figure 8 – Equipotential bonding in a structure with steel reinforcement . 29
Figure 9 – Integration of conductive parts of internal systems into the bonding network . 30
Figure 10 – Combinations of integration methods of conductive parts of internal
systems into the bonding network . 31
Figure A.1 – LEMP situation due to lightning strike to the structure . 42
Figure A.2 – Simulation of the rise of the field of the subsequent stroke (0,25/100 µs)

by damped 1 MHz oscillations (multiple impulses 0,2/0,5 µs) . 45
Figure A.3 – Large volume shield built by metal reinforcement and metal frames . 46
Figure A.4 – Volume for electrical and electronic systems inside an inner LPZ n . 47
Figure A.5 – Reducing induction effects by line routing and shielding measures . 48
Figure A.6 – Example of SPM for an office building . 50
Figure A.7 – Evaluation of the magnetic field values in case of a direct lightning strike . 51
Figure A.8 – Evaluation of the magnetic field values in case of a nearby lightning strike . 53
Figure A.9 – Distance s depending on rolling sphere radius and structure dimensions. 56
a
Figure A.10 – Types of structure geometries with different volume shields . 58
Figure A.11 – Magnetic field strength H inside a grid-like shield for the cubic
1/MAX
structure shown in Figure A.10 [14] . 59
Figure A.12 – Magnetic field strength H inside a grid-like shield for the cubic
1/MAX
structure according to mesh width . 60
Figure A.13 – Low-level test to evaluate the magnetic field inside a shielded structure . 61
Figure A.14 – Voltages and currents induced into a loop formed by lines . 62
Figure B.1 – SPM design steps for an existing structure . 70
Figure B.2 – Methods of establishing LPZs in existing structures . 73

– 6 – IEC 62305-4:2024 © IEC 2024
Figure B.3 – Reduction of loop area using shielded cables close to a metal plate . 76
Figure B.4 – Example of a metal plate for additional shielding . 76
Figure B.5 – Protection of aerials and other external equipment . 78
Figure B.6 – Separation distance maintained or not maintained . 79
Figure B.7 – Inherent shielding provided by bonded ladders and pipes . 80
Figure B.8 – Ideal positions for lines on a mast (cross-section of steel lattice mast) . 80
Figure B.9 – Upgrading of the SPM in existing structures . 82
Figure C.1 – Selection of SPDs by source of damage . 86
Figure C.2 – Example of installation of an SPD to reduce the effect of SPD lead length . 88
Figure C.3 – Surge voltage between live conductor and bonding bar . 91
Figure C.4 – Equipment with two ports and SPDs on both services bonded to two
different earthing points of a non-equipotential earthing system . 93
Figure D.1 – Installation example of SPD test class I, class II and class III in a TN

system . 100
Figure D.2 – Basic example of different sources of damage to a structure and lightning
current distribution within a system . 101
Figure D.3 – Example of the simplified current distribution in a TN power distribution
system . 102
Figure E.1 – Approach to computer simulation used to analyse lightning current

sharing . 105
Figure E.2 – MEN earthing system . 108
Figure E.3 – Parallel connected structures . 109
Figure E.4 – Influence of lightning current flow in parallel connected structures . 109
Figure E.5 – Influence of lightning current flow in star connected structures . 110
Figure E.6 – Influence of other metallic conductive services on lightning current
sharing . 110
Figure E.7 – Influence of lightning current flow from S3 events . 111
Figure E.8 – Structures with externally installed equipment and non-isolated LPS . 112
Figure E.9 – Protection of internally located sub-station transformers . 114
Figure F.1 – Current sharing between LPS down conductors and the internal cabling of
a PV system in which the separation distance s has not been maintained . 116
Figure F.2 – Protection of a roof-mounted PV system . 117
Figure F.3 – Free-field PV power plant with multiple earthing and meshed earthing

system . 120
Figure G.1 – Example circuit of an SPD discharge current test under service conditions . 123
Figure G.2 – Example circuit of an induction test due to lightning currents . 123
Figure H.1 – Induced loop by a lightning current on the structure . 125
Figure H.2 – Induced loop by a lightning current near the structure . 125
Figure I.1 – Use of SPDs to protect windings of SIT . 129

Table 1 – Minimum cross-sections for bonding components . 33
Table 2 – SPM management plan for new buildings and for extensive changes in
construction or use of existing buildings . 37
Table A.1 – Rated impulse voltage of equipment per IEC 60364-4-44:2007, Clause 443
and IEC 60364-4-44:2007/AMD1:2015, Clause 443 . 41
Table A.2 – Parameters relevant to source of harm and equipment . 43

IEC 62305-4:2024 © IEC 2024 – 7 –
Table A.3 – Examples for I = 100 kA and w = 2 m . 53
0/MAX m
Table A.4 – Attenuation of the magnetic field of grid-like spatial shields for a plane
wave . 54
Table A.5 – Rolling sphere radius corresponding to maximum lightning current . 56
Table A.6 – Examples for I = 100 kA and w = 2 m corresponding to
0/MAX m
SF = 12,6 dB . 57
Table B.1 – Structural characteristics and surroundings . 67
Table B.2 – Installation characteristics . 68
Table B.3 – Equipment characteristics . 68
Table B.4 – Other questions to be considered for the protection concept . 68
Table B.5 – Type of LPS . 68
Table C.1 – Required rated impulse voltage of equipment. 87
Table C.2 – Connection of the SPD dependent on supply system . 94
Table C.3 – Selection of impulse discharge current (I ) where the building is
imp
protected against direct lightning strike (S1) based on simplified rules . 95
Table C.4 – Nominal discharge current (I ) in kA depending on supply system and
n
connection type . 95
Table C.5 – Selection of impulse discharge current (I ) where the building is
imp
protected from direct strikes to the line (S3) . 96
Table D.1 – Preferred values of I . 99
imp
Table E.1 – General trends associated with protection installations for different power
distribution systems . 107
Table F.1 – Simplified calculated values of I (I ) and I (I ) for voltage-
imp 10/350 n 8/20
limiting SPDs on the DC side of a PV installation mounted on the roof of a building with
an external LPS if the separation distance is not maintained (see Figure F.1) . 118
Table F.2 – Simplified calculated values of I (I ) for voltage switching SPDs
imp 10/350
on the DC side of a PV installation mounted on the roof of a building with an external
LPS if the separation distance is not maintained (see Figure F.1) . 119
Table F.3 – Simplified calculated values of I and I for SPDs intended to be
10/350 8/20
used in free-field PV power plants with multiple earthing and a meshed earthing
system based on Figure F.3 . 121
Table H.1 – Flashes near the structure: induced voltage per square metre q as a
function of LPL. 126
Table H.2 – Values of k . 127
c
Table H.3 – Values of k and k for some copper shields . 127
S1 S2
– 8 – IEC 62305-4:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PROTECTION AGAINST LIGHTNING –

Part 4: Electrical and electronic systems within structures

FOREWORD
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IEC 62305-4 has been prepared by IEC technical committee 81: Lightning protection. It is an
International Standard.
This third edition cancels and replaces the second edition published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of new informative Annex E and Annex F on the determination of current sharing
using modelling and current sharing in PV installations respectively;
b) addition of a new informative Annex G on methods of testing of system level behaviour;
c) addition of a new informative Annex H on induced voltages in SPD-protected installations.

IEC 62305-4:2024 © IEC 2024 – 9 –
The text of this International Standard is based on the following documents:
Draft Report on voting
81/733/FDIS 81/752/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International St
...