Lightning protection takes a step forward with the new IEC 62305-2:2024 standard, which redefines how we assess and manage risk.
The release of the updated IEC 62305-2 standard represents a significant milestone in the methodology for assessing lightning-related risks. This revision introduces more stringent technical criteria and formally acknowledges the strategic importance of Thunderstorm Warning Systems in safeguarding people, infrastructure, and critical services. At INGESCO, we examine the key updates and demonstrate how our Previstorm system is fully aligned with these new regulatory requirements.
Unified Risk Approach and Emphasis on Service Continuity
One of the most noteworthy changes in the 2024 edition is the unification of risk analysis. Rather than evaluating risks related to loss of human life, service disruption, or structural damage independently, the standard now combines them into a Total Risk (R). This streamlining enables a clearer, more actionable assessment, enhancing decision-making for engineers and lightning protection designers.
The updated standard also introduces Damage Frequency (F) as a critical metric, highlighting the potential impact of lightning on the availability of internal systems and, by extension, the operation continuity of an installation. This is particularly relevant for sectors where operational downtime can have critical consequences, such as healthcare, manufacturing, and telecommunications.
Revised Lightning Ground Strike Density Parameter (NG)
The previous metric for cloud-to-ground lightning density by km2 and year (NG) has been replaced by Lightning Strike Ground Density (NSG). Unlike its predecessor, NSG provides a more accurate risk profile by differentiating between multiple discharges at the same location.
Thunderstorm Warning Systems
A major advancement in the 2024 edition is the formal integration of Thunderstorm Warning Systems (TWS), in line with IEC 62793:2020. These systems are now recognized as effective tools to proactively reduce lightning-related risk, as they allow for a timely implementation of preventive actions such as suspending outdoor activities or safeguarding sensitive equipment or infrastructure. heir implementation adds value to the overall lightning protection strategy, especially in critical or exposed facilities.
Previstorm System
At INGESCO, we offer Previstorm, an electric field sensor-based TWS specifically designed in compliance with IEC 62793. In contrast to systems relying solely on electromagnetic field detection, Previstorm offers:A diferencia con otros sistemas basados únicamente en sensores de campo electromagnético, Previstorm ofrece:
- Real-time, local monitoring of the atmospheric electric field
- Continuous lightning risk evaluation, even in the absence of prior strikes
- Seamless integration with safety and automation systems, enabling automatic alerts and the activation of predefined safety protocols
Thanks to this technology, our clients can demonstrably reduce their risk and comply with the criteria of the new IEC 62305-2:2024.
Do you need help with lightning damage risk assessment? Would you like to learn more about how Previstorm system can help reduce the risk?
Contact our team for expert consultation.