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

Question

Quizplus · Accepted Answer

According to NEC Table 310.15(B)(16), the minimum size aluminum conductor for a 100 A circuit with XHHW insulation at 75°C is 6 AWG.

Single Aluminum Conductors with Type XHHW Insulation Are Mounted Overhead