Answer / h s dhillon

1) Althogh the question is not fully clear,I try to answer
it according to my understanding. The neutral wire is used
as return path with a phase wire to complete the circuit ,
whereas, the ground wire is basically meant for protection
against faults. Although, both these wires are joined
together at the distribution T/F and hence, the ground wire
can also work as neutral wire(of course, in a poor manner)
but in that case the return current flows through the
earth wire which is generally a bare steel wire and it
gets heated and melts the PVC insulation of the
neighbouring wire, ultimately leading to a short circuit.
2)The amount of current depends upon the load (Wattage) of
the appliance connected to the supply.

Answer / udayak25

1. To complete the ckt neutral is necessory.
And when accidints like shock etc happen then grounding or
earthing is necessary to flow faulty current to the earth.

2.Yes, in domestic 220 1ph or 440 3ph we r getting, but the
current in domestic lavel we have to consider Ele. Board
Sanctioned load. it means suppose EB sanction load is 4kW,
but connected load is around 7kW, for this we have to
consider current for sanction load only i.e 4kW not for
7kW. So current for 4 kW will be 21A, so MCB will be of 25A.

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