IEC 62305-3:2018 PRV 
Pre release version

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


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This Final Draft International Standard is an up to 6 weeks' pre-release of the official publication. It is available for sale during its voting period: 2018-10-05 to 2018-11-16. By purchasing this FDIS now, you will automatically receive, in addition, the final publication.

IEC 62305-3:2018 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 human beings due to touch and step voltages in the vicinity of an LPS (see IEC 62305-1). 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:
- Minimum thicknesses of metal sheets or metal pipes are given in Table 4 for air-termination systems where it is necessary to prevent hot-spot problems. Maximum temperature rises ΔT (K) and time duration t50 (s) for different thickness and long strokes are also given.
- Cross reference to IEC 62561 (all parts) is made in choosing components of the LPS.
- The application of two methods – general and simplified – for separation distance calculation is clarified.
- Some changes to the requirements for continuity of steel reinforcement are made.
- Revision of positioning of air-termination conductors according to the three accepted methods and a more precise description of the methods for positioning of the air-termination systems, according to the complexity of structures to be protected, are made. The main text has been simplified, Annex A has been deleted and all detailed information has been moved to Annex D.
- Information on the protection of green roofs is introduced in Annex D.
- Information on the protection of protruding parts on facades of tall buildings is introduced in Annex D.

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Relevant for

rural electrification

Additional information

Publication typeInternational Standard
Publication date2018-10-05
Available language(s)English/French
TC/SCTC 81 - Lightning protectionrss
ICS29.020 - Electrical engineering in general
91.120.40 - Lightning protection
Stability date  2026
File size8951 KB

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