Deep Dive: G0B01
The correct answer is A: Only the hot wires. The wire or wires in a four-conductor 240 VAC circuit that should be attached to fuses or circuit breakers are only the hot wires. Hot wires (ungrounded conductors) must be protected by fuses or breakers; neutral and ground should not be fused. For amateur radio operators, this is critical electrical safety. Understanding this helps ensure safe electrical installation.
Why Other Answers Are Wrong
Option B: Incorrect. Neutral wire shouldn't be fused - only hot wires should be fused. Neutral is grounded and shouldn't be interrupted. Neutral is wrong. Option C: Incorrect. Ground wire shouldn't be fused - ground should never be interrupted. Ground is wrong. Option D: Incorrect. All wires shouldn't be fused - only hot wires should be fused. All wires is wrong.
Exam Tip
240V circuit fusing = only hot wires. Think 'H'ot 'W'ires = 'H'ave 'W'ires fused. Hot wires (ungrounded conductors) must be protected by fuses or breakers; neutral and ground should not be fused. Not neutral, not ground, not all - just hot wires.
Memory Aid
240V circuit fusing = only hot wires. Think 'H'ot 'W'ires = 'H'ave 'W'ires fused. Hot wires (ungrounded conductors) must be protected by fuses or breakers; neutral and ground should not be fused. Critical electrical safety.
Real-World Example
A four-conductor 240 VAC circuit: Two hot wires (L1 and L2), neutral, and ground. Only the hot wires should be attached to fuses or circuit breakers. Neutral and ground should never be fused - they must remain continuous. This is critical electrical safety - only hot wires are protected by fuses or breakers.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G0B
Reference: National Electrical Code
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G0B topic.