IEC 62305-2:2024/COR2:2026

• Abstract:

  IEC 62305-2:2024 is applicable to the risk management of 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 provides a means for the selection of appropriate protection measures to be adopted to reduce the risk 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:; a) The concept of a single risk, to combine loss of human life and loss due to fire, has been introduced.; b) The concept of frequency of damage that can impair the availability of the internal systems within the structure has been introduced.; c) The lightning ground strike-point density NSG has been introduced replacing the lightning flash density NG in the evaluation of expected average annual number of dangerous events.; d) Reduction of a few risk components can be achieved by the use of preventive temporary measures activated by means of a thunderstorm warning system (TWS) compliant with IEC 62793. The risk of direct strike to people in open areas has been introduced, considering the reduction of that risk using a TWS.; The content of the corrigendum 1 (2024-10) has been included in this copy.

• Status: Published
• Publication Date: 11-Oct-2026
• ICS: 29.020 - Electrical engineering in general
• ICS: 91.120.40 - Lightning protection
• Technical Committee: TC 81 - Lightning protection
• Drafting Committee: MT 9 - TC 81/MT 9
• Current Stage: PPUB - Publication issued
• Start Date: 12-Oct-2026
• Completion Date: 02-Dec-2026

• Corrects: IEC 62305-2:2024 - Protection against lightning - Part 2: Risk management
• Effective Date: 25-Sep-2026

INTERNATIONAL ELECTROTECHNICAL COMMISSION
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
IEC 62305-2 IEC 62305-2
Edition 3.0  2024-09 Édition 3.0  2024-09

Protection against lightning - Protection contre la foudre -
Part 2: Risk management Partie 2: Évaluation des risques

CO RRI G E NDUM 2
3.46 3.46
lightning protection system système de protection contre la foudre
LPS SPF
Replace, in the existing definition, the Remplacer, dans la définition existante,
words "living beings" with "human les mots "êtres vivants" par "êtres
beings". humains".
Table 3 – Risk components for Tableau 3 – Composantes de risque
different sources of damage and types pour différentes sources de dommages
of loss et différents types de pertes
Replace, in the existing first column, the Remplacer, dans la première colonne
words "living beings" with "human existante, les mots "êtres vivants" par
beings". "êtres humains".
9.3 Procedure to evaluate the need 9.3 Procédure d'évaluation du
of protection for frequency of besoin de protection pour la
damage F fréquence des dommages F
Replace, in the existing Note 1, the term Remplacer dans la Note 1 existante, les
"tolerable risk" with "tolerable frequency mots "du risque tolérable" par "de la
of damage". fréquence tolérable des dommages".
B.3 Probability P that a flash B.3 Probabilité P qu'un impact
AD AD
will cause damage to an entraîne des dommages sur
exposed person on the une personne exposée qui se
structure tient sur la structure
Delete, immediately after the existing Supprimer, immédiatement après la Note
Note 3, the key item and corresponding 3 existante, l'élément de la légende et la
definition "P is the probability that a définition correspondante "P est la
am am
flash to a structure will cause damage due probabilité qu'un impact sur une structure
to touch and step voltages." provoque des dommages dus à des
tensions de contact et de pas."
IEC 62305-2:2024-09/COR2:2026-10(en-fr)

B.7 Probability P that a flash to a B.7 Probabilité P qu'un impact
U U
line will cause damage due to sur une ligne entraîne des
touch voltage dommages dus à des tensions
de contact
Replace, in the existing Note 3, the Cette correction ne s'applique qu'à la
reference "62305-1" with "IEC 62305-1". langue anglaise.
B.12 Probability P that an B.12 Probabilité P qu'un matériel
e e
equipment will be exposed soit exposé à un événement
to a damaging event provoquant des dommages
Replace, in the existing Note 2, the words Remplacer, dans la Note 2 existante, les
"explosive atmosphere time" with mots " temps de présence maximal d'une
"explosive atmosphere time per year". atmosphère explosive" par "temps de
...