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Lightning protection systems - What they do and don't do. A lightning protection system's only purpose is to ensure safety to a building and its occupants if lightning happens to hit it directly, a task accomplished by providing a good, safe path to ground for the lightning to follow.
The location of the most vulnerable places on the. structure to be struck by lightning is the first step on the. design of the external lightning protection system. Traditionally, the Rolling Sphere Method [1] has been. used to locate of the probable lightning strike points on. buildings.