Answer / animesh

in single phase system, there will be a return current
always. if u touch the neutral u will get a shock.
but in case of 3 phase system,normally 0 current flows in
neutral bcz v1+v2+v3=0. u will experiecne a reverse current
shock only in case of unbalanced loading bcz of which phase
volatage changes and their vector sum is no more equal to 0.

Answer / k.prakashchandra

The vector sum of 3 phase equal currents is zero

Answer / manik chatterjee

Because electrons always flows from negative to positive
and current flows from positive to negative.

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