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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.
When lightning strikes a building, house or other structure, it follows metal conductors such as electrical wiring, plumbing, and telephone lines from the structure to the ground. When this process occurs, it usually leaves the inhabitants unharmed.