Three phase, 4 wire - Necessity of more copper than 2 wire system

Q.  With the same maximum voltage to earth, which among the following AC systems with 0.8 pf will need more copper compared to 2 wire system?
- Published on 23 Nov 15

a. Single phase, 2 wire
b. Single phase, 3 wire
c. Three phase, 3 wire
d. Three phase, 4 wire

ANSWER: Three phase, 4 wire

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