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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.
Surge arresters work by fusing the line that goes to the protected device. This prevents voltage from traveling into the device and pushes it out through a ground system instead. This is both the biggest strength and biggest danger of a surge arrester.