naSRPS EN IEC 62305-2:2023

Protection against lightning - Part 2: Risk management

Scope

IEC 62305-2:2018 is applicable to the management of risk, for a structure, due to lightning flashes to earth.
Its purpose is to provide a procedure for the evaluation of such a risk. Once an upper tolerable limit for the risk has been selected, this procedure allows for the selection of appropriate protection measures to reduce the risk to or below the tolerable limit.
Risk management also includes the evaluation of frequency of damage of internal systems caused by surges due to lightning flashes to earth. Once an upper tolerable limit for the frequency of damage has been selected, this procedure allows for the selection of appropriate protection measures to reduce the frequency of damage to or below the tolerable limit.
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:
the concept of types of loss with social relevance has been introduced;
the concept of frequency of damage that may impair the availability of the internal systems within the structure has been introduced;
provisions activated by means of a thunderstorm warning system (TWS) which can reduce the risk and the frequency of damage have been introduced;
the lightning ground strike-point density NSG has been introduced replacing the lightning flash density NSG in the evaluation of the expected average annual number of dangerous events.