nfc17-102 standards provide an evaluating method, as a result of several studies of lightning protection systems.
it compares the early streamer time induced by alp lightning rod, to a simple franklin lightning rod in the same environmental and placement test condition.
A relationship between time, propagation speed, and in consequence, the stroke distance and the protection zone, is obtained in determining the value.
the evalustion of the risk is being struck, and the structure proctection needs is obtaining following the apendix b of the standard mentioned above..
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