IEC 62305 is an international standard for lightning protection systems, and provides information related to lightning alarms (lightning detection devices).

It is covered in IEC 62305-2 (Risk Management).

This standard provides a systematic method for assessing lightning risk and determining protective measures, enabling early warning systems such as lightning alarms to detect lightning risks in advance and implement appropriate protective and response measures.

IEC 62305 consists of:

• IEC 62305-1: General principles and overview of lightning protection system design

• IEC 62305-2: Risk management, lightning risk assessment, and determination of lightning protection needs

• IEC 62305-3: Protection against physical damage to structures and risks to personnel

• IEC 62305-4: Surge protection for electrical and electronic systems

In particular, the recent update to IEC 62305-2:2024 emphasizes the importance of lightning alarms (thunderstorm alarms), stating that these devices are essential for cost-effective lightning protection. They provide early warning before lightning strikes occur, contributing to the protection of people and equipment.

Lightning alarms are linked to air-termination systems installed around buildings and structures, detecting lightning strikes or lightning activity before they occur, facilitating a rapid response. According to IEC 62305, a lightning protection system consists of the following elements:

• Air Conductor System (Air-Terrain)

• Lower conductor system

• Grounding system

• Internal surge protection system

Lightning alarms, integrated with these systems, are an important means of minimizing the risk of lightning strikes to structures and reducing damage and safety risks from lightning strikes.

In summary, the IEC 62305 standard provides guidance on the design, evaluation, installation, and operation of a comprehensive lightning protection strategy, including early warning systems such as lightning alarms. IEC 62305-2 specifically addresses risk assessment and the need for warning systems. The latest version clarifies the economic benefits and necessity of lightning alarms.