Which conductor carries the return current from unbalanced loads in a three-phase system?

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Multiple Choice

Which conductor carries the return current from unbalanced loads in a three-phase system?

In a three-phase system with a neutral, the neutral conductor carries the return current when the loads on the phases are unbalanced. If the loads are not equal, the currents in the three phases don’t cancel each other, so the neutral carries the difference back to the source. When the loads are balanced, the currents sum to zero in the neutral and ideally no current flows there. Ground serves safety and fault protection, not normal current return. The phase conductors themselves carry their own currents to the loads; the neutral is the path for any imbalance.

In a three-phase system with a neutral, the neutral conductor carries the return current when the loads on the phases are unbalanced. If the loads are not equal, the currents in the three phases don’t cancel each other, so the neutral carries the difference back to the source. When the loads are balanced, the currents sum to zero in the neutral and ideally no current flows there. Ground serves safety and fault protection, not normal current return. The phase conductors themselves carry their own currents to the loads; the neutral is the path for any imbalance.

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