BS EN 62305-3:2011 Protection against lightning – Part 3 Physical damage to structures and live hazard

BS EN 62305-3:2011

Protection against lightning

Part 3: Physical damage to structures and live hazard

National foreword

This British Standard is the UK implementation of EN 62305-3:2011.
It was derived from IEC 62305-3:2010. It supersedes
BS EN 62305-3:2006, which will be withdrawn on 27 May 2012.

Parts 1,3 and 4 of EN 62305 contain references to EN 62305-2:2011.
This reference is incorrect since Part 2 is not due to be published until 2012 to allow for the finalization of the CENELEC common modifications.

Until EN 62305-2:2012 is published and adopted as BS EN
62305-2:2012,the existing BS EN 62305-2:2006 can continue to be used with the newly published BS EN 62305-1:2011, BS EN 62305-3:2011 and BS EN 62305-4:2011.

The CENELEC common modifications have been implemented at the appropriate places in the text and are indicated by tags (e.g. C)The UK participation in its preparation was entrusted to Technical Committee GEL/81, Protection against lightning.

A list of organizations represented on this committee can be obtained on request to its secretary.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.
ISBN 978 0 580 61195 7
ICS 29.020; 91.120.40

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2011.



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 EN62305-3:2006+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 proble

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 interna 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
with the EN have to be withdrawolandards conflicting

– latest date by which the national standards conflicting
with the EN have to be withdrawn (dop) 2014-01-02