Lighting Arrestor

  • When the electrical potential between two clouds or between a cloud and earth reaches a sufficiently high value the air becomes ionized along a narrow path and a lightning flash results which can extend upto multiple kilometers.
  • Buildings are protected from lightning by metallic lightning arrestors or surge arrestors extending to the ground from a point above the highest part of the roof.
  • The arrestor has pointed edges on one side and the other side is connected to a long thick copper strip/wire (down conductor) which runs down the building and connects to the earthing system.
  • In the event of lightning falling on the building, the lightning arrestor directs the charge through down conductor and into the earth through the earthing system, safely.

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