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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.
An active protection system is a system (usually for a military application) designed to prevent line-of-sight guided anti-tank missiles /projectiles from acquiring and/or destroying a target.