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Lightning protection systems. Lightning can easily damage a number of different building materials, and the large electrical currents can cause fires within the interior or even side flashes. Side flashes are small explosions of highly pressurized, super-heated air that occur inside the nooks and crannies of structure materials.
Basic protection is provided by insulation or barriers. When the basic protection fails in this type of installation the fault protection is afforded by simple separation from the main circuit because it has no fault path to Earth and therefore no electric shock.