General exam question G0B01
Subelement G0, ELECTRICAL AND RF SAFETY· Group G0B
Which wire or wires in a four-conductor 240 VAC circuit should be attached to fuses or circuit breakers?
- A.Only the hot wires (correct answer)
- B.Only the neutral wire
- C.Only the ground wire
- D.All wires
WhyOnly the hot wires in a four-conductor 240 VAC circuit should be attached to fuses or circuit breakers. In a 240 VAC circuit with two hot legs, a neutral, and a ground, only the hot conductors carry current that needs to be interrupted on a fault, so only the hot wires are connected through fuses or circuit breakers, answer A. The neutral and ground conductors are deliberately left unfused so they always provide a continuous return and safety path, so B, C, and D are wrong.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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