In a Four-Wire Wye (Star) system with both source and load are solidly grounded. If the load impedances are not equal (loads are unequally distributed) which is the case most of my time, this load unbalance cause the line/phase currents to be different in magnitude and displaced from one another by unequal angles, where their vectorial/phasor sum would result in nonzero current to flow from the load neutral back to the supply neutral. Assuming a negligible resistance in the neutral wire and since it's a solidly grounded system shouldn't the supply neutral and the load neutral be at the same potential? If yes then how would current flow in the neutral? and if they are not at the same potential why?
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