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

EN 62305-3:2011
en: Protection against lightning — Part 3: Physical damage to structuresand life hazard
uk:

EUROPEAN STANDARD

NORME EUROPEENNE EUROPAISCHE NORM

ICS 29.020; 91.120.40
EN 62305-3
March 2011
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)

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 StandardizationComite Europeen de Normalisation ElectrotechniqueEuropaisches Komitee fur Elektrotechnische Normung
Management Centre: Avenue Marnix 17,

Foreword
The text of the International Standard IEC 62305-3:2010, prepared by IECTC81, Lightning protection, together with common modifications prepared by the Technical Committee CENELEC This European Standard supersedes EN 62305-3:2006 + corr. Nov.2006 + corn 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.

-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)

EN 62561 series In preparation.
EN 62561-1
At draft stage.Lightning Protection System Components (LPSC) (IEC 62561 series)
Lightning Protection System Components (LPSC) - Part 1: Requirements for connection components (IEC 62561) EN 62561-3 2) 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
In the 2 nd 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”.
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
Replace the 12 th 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
After the 2 nd paragraph, add the following NOTE:
NOTE For more details see EN 50164 series.
E.5.5 Components
Replace the 1 st 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
At the end of the 6 th paragraph, add the following:
“...according to