What is EN 62305-3:2020?

The International Electrotechnical Commission (IEC) has developed a set of standards, known as IEC 62305, which provides guidance on the protection against lightning. One of the key parts of this series is EN62305-3:2020, which specifically focuses on physical damage to structures and life hazard.

Understanding the Scope

The standard EN62305-3:2020 outlines the requirements for external lightning protection systems (LPS) that aim to minimize the risks associated with both direct lightning strikes and nearby lightning-induced effects. This includes determining the level of protection required for a particular structure, selecting appropriate Lightning Protection Components (LPCs), and installation guidelines.

EN62305-3:2020 takes into consideration various parameters such as the structure's height, occupancy, geographical location, and the characteristics of the surrounding environment. By analyzing these factors, the standard provides a comprehensive framework for designing and implementing effective LPS.

Designing an Effective LPS

EN62305-3:2020 emphasizes the importance of conducting a risk assessment before designing an LPS. This involves evaluating the probability of lightning strikes, consequences of lightning damage, and the vulnerability of the structure and its occupants. The risk assessment enables engineers to determine the acceptable risk level and select appropriate protection measures.

The standard also provides detailed guidance on selecting suitable LPCs based on their performance characteristics and compatibility with the structure. It covers various aspects, including air terminals, down conductors, earthing systems, surge protective devices, and equipotential bonding.

To ensure proper installation, EN62305-3:2020 highlights important considerations, such as correct positioning of air terminals, minimizing metallic forms inside the structure, ensuring proper continuity of protective conductors, and adequate separation distances between lightning protection components.

Ongoing Compliance and Maintenance

EN62305-3:2020 stresses the need for regular inspections and maintenance of LPS to ensure ongoing compliance and effectiveness. It recommends periodic tests and checks to identify any potential issues or deterioration of components over time, which might compromise the system's performance.

This includes visual inspections, corrosion checks, and measurement of earth resistance. In cases where modifications to the structure occur, such as renovations or expansions, re-evaluating the effectiveness of the LPS and implementing necessary updates are highly recommended.

In conclusion, EN62305-3:2020 sets out important guidelines for designing, installing, and maintaining effective lightning protection systems. By adhering to these standards, structures can minimize the risks associated with lightning strikes, protect lives, and prevent physical damage. Implementing an appropriate LPS not only ensures compliance but also promotes safety in an unpredictable natural phenomenon like lightning.