Earthing Conductor Size
Earthing Electrode conductor size should be necessary to ensure that the earthing conductor will be able to with stand the maximum earth fault current.
Like a normal power cable under fault, the earthing grid conductors experience an adiabatic short circuit temperature rise. However unlike a fault on a normal cable, where the limiting temperature is that which would cause permanent damage to the cable's insulation, the temperature limit for earthing grid conductors is the melting point of the conductor. In other words, during the worst case earth fault, we don't want the earthing grid conductors to start melting!
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