Single aluminum conductors with type XHHW insulation are mounted overhead on insulators to supply an outbuilding from another building. The 120/240 V, three-wire feeder is protected at the source with a 100 A circuit breaker. The minimum size ungrounded feeder conductors permitted are ____ AWG.
A. 4
B. 6
C. 8
D. 10
Answer: B
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