Risk Assessment
Some structures are inherently more or less at risk of being struck by lightning. The risk for a structure is a function of the size (area) of a structure, the height, and the number of lightning strikes per year per mi² for the region. For example, a small building will be less likely to be struck than a large one, and a building in an area with a high density of lightning strikes will be more likely to be struck than one in an area with a low density of lightning strikes. The National Fire Protection Agency provides a risk assessment worksheet in their lightning protection standard.
IEC lightning risk assessment comprises four parts: loss of living beings, loss of service to public, loss of cultural heritage, and loss of economic value. Loss of living beings is the most important and this is the only loss taken into consideration for many nonessential industrial and commercial applications. IEC risk assessment calculations can be very complicated unless done by a software.
Read more about this topic: Lightning Rod
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