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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.
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.