Question

If the system is a three-wire system, the currents flowing towards the load in the three lines must add to ___ at any given instant.

(a) 1

(b) 2

(c) 3

(d) zero

I got this question during an interview.

This key question is from Three-Phase Unbalanced Circuits in chapter Polyphase Circuits of Network Theory

Answer 1

The correct option is (d) zero

To explain I would say: If the system is a three-wire system, the currents flowing towards the load in the three lines must add to zero at any given instant.