![]() For high rise buildings, all the part of the building above 120 m should also be provided with this lateral protection. Lightning protection standards indicate that, besides the roof, for buildings higher than 60 meters the 20% upper part should be protected with an air termination system. The consequences of an uncontrolled lightning strike may be also dangerous for people inside the building, due to the difficulties of evacuation in case of fire and even due to the damages that surges could cause on safety systems, for example for elevators. ![]() ![]() They are often emblematic buildings, placed in the main business centers and usually containing costly and sensitive equipment. New construction techniques have allowed the structural development of the buildings and optimized edification costs, so nowadays skyscrapers are more and more usual in cities, even in those with a high flash density. Besides, according to these standards, for buildings higher than 60 meters lateral impacts should also be considered. High buildings are therefore preferred points for lightning strikes, so that risk assessment standards consider, for calculating the equivalent collection area of a structure, a surface of 3 times its height around. During its formation lightning moves in any direction, but only until it finds a way to ground: then the path for the discharge is already created.
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