RISK ASSESSMENT
The regulations UNE 21186, NFC 17102 and NP 4426 contain a method for assessing the risk of lightning, extracted from the international standard IEC 62.305-2, which determines the necessary protection systems. The following program is a simplified and automated version of this method, in order to make it more accessible to everyone. If a more precise calculation is required, or more complex structures, please contact us.
The aforementioned regulations include 3 parameters for calculating the risk index:
- The number of dangerous events per year.
- The probability of damage to a structure.
- The losses in case of damage.
1. Dangerous events are divided into 4 types, depending on how they can reach the structure:
- Events in the structure.
- Events near the structure.
- Events in power lines that affect the structure.
- Events near power lines that affect the structure.
2. The probability of damages is divided among three parameters:
- Direct injuries to living beings.
- Physical damage to the structure.
- Damage to electrical and electronic systems.
3. The losses are divided into 4 types:
- Human losses.
- Losses of service.
- Losses of cultural heritage.
- Economic losses.
Protection against lightning is necessary when the calculated risk exceeds the tolerable risk set out in the regulations.
