Answer Posted / lijo
Neutral is used to complete the circuit. It will have the
same amount of current as in the phase wire, but u wont get
a shock when u touch a neutral wire as it is earthed at
transformer/generator side i.e. u and the neutral are at d
same potential as current flows only from higher potential
to lower potential, the same being posted earlier.
Neutral is just an intersection of three coils at one point
(Star connection) in a Xmer and therefore a part of source.
It is earthed to prevent arcing ground faults, a phenomenon
caused due to single line to ground fault( one phase wire
say R phase getting connected to ground resulting in higher
currents in other phases causing flashover of insulator).
Earthing wire does not carry any current in normal
operation, but it will in abnormal conditions say when
equipment body comes in contact with live wire. Since its
operation may require human touch, we may get a shock. This
current is therefore bypassed to ground through earthing
wire/strip, which is directly connected to metal body which
can conduct current and not concerned with its operation in
most cases.
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