why neutral and earth should not be connected on 3 phase
440v/50c/s supply at consumer side. where as on
25kv/ac/50c/s railway traction substation neutral and earth
will be connected and track at substation. and track will
act as neutral and earth. Reasons for this is needed
urgently
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Answer Posted / k.prakashchandra
Consumers earth is for connecting to metal bodies to prevent
shock . The neutral is already earthed at the TC and another
earth means extra expenditure.During earth fault ,there will
be temporary rise in voltage resulting in burning out of
potential coils of the energy meter.And if earth is
connected to neutral wire of supply after the RCCB, it will
trip as a portion of neutral current will be bypassed.
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