Lightning strikes pose a severe threat to structures, electronic systems, and human life. To mitigate these hazards, the International Electrotechnical Commission developed the IEC 62305-2 standard, which provides a comprehensive framework for lightning risk management. However, full compliance with this standard involves complex, mathematically rigorous calculations that require significant time and expertise.
: Tools such as LIRA (Lightning Risk Assessment) and other database-driven programs now offer the full functionality of the standard, including support for multiple zones, multiple services, adjacent structures, and detailed cost-benefit analysis for economic losses (Risk Component L4). LIRA, for example, was developed using MATLAB GUIDE and implements all the equations and tables from the latest editions of IEC 62305-2.
Technology evolves quickly, and risk assessment software is no exception. As of 2010, SiRAC was removed from the IEC 62305-2 standard and replaced with more advanced solutions. The 2010 edition of the standard no longer included the simplified calculator as an informative annex, and by 2013, national bodies like the German DKE explicitly stated that the tool had been discontinued.
The researchers applied both SIRAC and the TUPÃ tool to a heritage building in La Plata, Argentina. The goal was not just to get a final risk number but to compare how each tool handled the input parameters, what data entry options they offered, and how their partial and final results aligned with manual calculations based on the standard. simplified iec risk assessment calculator sirac
While originally proposed in the informative annex of the standard, the official SIRAC tool (v.1.0.0) was eventually phased out due to its inability to handle complex structures with multiple zones . However, the concept of a "simplified" assessment remains vital for identifying lightning risks without needing deep specialized expertise .
Once parameters are entered, the tool calculates risk probabilities ( , etc.) and compares them against tolerable risk limits ( RTcap R sub cap T
Elias hesitated. He looked at the notes he’d taken down in the substation. The switchgear was old, yes, but the real issue was the cabling. It ran through wooden trays in the basement. If a surge came through—triggered by a nearby lightning strike—the insulation wouldn't just fail; it would ignite. And the basement was where the maintenance crew took their breaks. Lightning strikes pose a severe threat to structures,
): Risk is lower if a building is surrounded by taller objects, as they act as natural shields . Occupancy Coefficient ( Lf1cap L sub f 1 end-sub
: The value of the building's contents (e.g., flammable materials, electronics) and the number of people regularly inside.
The relative consequence or scale of destruction caused by an event. : Tools such as LIRA (Lightning Risk Assessment)
Once all data was entered, SiRAC would compute the relevant risk components (such as risk to human life, risk to cultural heritage, or economic losses) and determine if the total risk exceeded a tolerable threshold. If the risk was too high, the engineer could adjust the parameters (e.g., add a lightning rod, improve earthing) and re-run the calculation to see if the risk dropped to acceptable levels.
Assists in determining the necessary standard of Ex-certified tools and procedures required during turnaround or repair operations. Conclusion
While the full standard involves hundreds of variables and complex manual formulas, the Simplified Calculator