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Lightning currents are always used when lightning strikes directly into or near the building. After the impact, lightning currents seek all possible paths towards the earth; they also typically spread into the earth via metal pipes. It is known from analyses of damage reports that damage to electrical equipment that is connected to the electricity or telephone network, for example, can occur up to 3 km away from the actual lightning strike.
The special feature of lightning currents is the high energy content: If the current is high enough, i.e.
in the vicinity of the impact site, fire can develop in the presence of flammable material and oxygen. Overvoltages, on the other hand, are different: the currents that occur are low, as is the energy.
Sensitive electrical and electronic equipment is disrupted or destroyed; however, there is usually no fire development.
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