Many homes with a TT earthing system have a single simple earth rod driven onto the ground, which is connected to the earth terminal at the dis board, and a 100mA RCCB on the incoming live and neutral protecting the house. A lot depends upon the water table locally.
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The elephant is a funny bird. It flits from bough to bough. It lays its eggs in a rhubarb tree and whistles, like a cow - Spike Milligan.
calculation of number of earthing
