Answer / sunil parmar

more current discharge in big & thick earthing pin and also, you can fix the top,first big & thick earthing pin in contact position so,any abnormal condition occur between phase-neutral ,its ground first.

Answer / k.prakashchandra

So that you can fix the top in one position only and hence
the phase and neutral connections are not
interchanged.Further the top remains firm .

Answer / ganesan

2 TIMES CURRENT DISCHARGE IN EARTHING PIN.BCOZ LOAD DEADTH
SHORT FAILURE OPERATION condition

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