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Lightning Arrestors is a 'Voltage Relief Valve' which remain closed until
voltage on the system rises to the level which causes values to open. The valve
then diverts the lightning harmlessly to the ground, thus keeping the equipment
safe Lightning arrestors rates from 1.1/6.6/9/18/30 KV up to 120 KV
etc.
The Arrestors are available in metal oxide Gapless type/ station
class type as per I.E.C. 99-4 of 1991. "Lamco"/ "Elpro" & "Oblum" makes.
Copper L.A are only put on the roof of the building to safe guard from natural
lighting.
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