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Answer Posted / deepu electrical supervisor
Yes, there will be current flow in the neutral wire based on the unbalanced condition. We used 3.5 core cables for power circuits and high gauge copper as its earth. In the case of lighting circuits we used 4 core cables cables and less gauge copper wire for its earth. Normally, the neutral point is properly grounded from the transformer neutral by means of copper plates, hence it is at zero potential. We know current flow from high potential to lower potential, so when we switch on the load there will be a tendency of current to flow from phase to neutral but the power is consumed by the load based on the ratings and its types. But at balanced load condition there will be very less current flow on the neutral wire because the load consumes full current. But when unbalanced fault occur there will be return current flow in the neutral wire to the source. In this case the circuit get tripped by circuit breakers.....
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