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

IEC 62305-3:2024 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 document is applicable to the:

a) design, installation, inspection and maintenance of an LPS for structures without limitation of their height,

b) establishment of measures for protection against injury to human beings primarily due to touch and step voltages.

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) 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 thicknesses and long strokes are also given.

b) Cross-reference to the IEC 62561 series is made for the use of reliable, stable, safe and appropriate LPS components.

c) The application of two metho