When lightning strikes--Factors to consider for metal construction and lightning protection

摘要

The probabilities of lightning striking a metal-roofed structure are no more or less than lightning striking any other kind of structure. Yet when a metal roof is called for, questions often arise regarding risks associated with lightning. A metal roof does not attract lightning, nor does it protect a structure against lightning. Assessing the need for lightning protection typically involves comparing the expected lightning frequency with the tolerable lightning frequency risk-which means weighing the lightning probability against consequence to life, environment and momentary loss.