Question 6061 of 850 · Texas Journeyman Electrician Exam
Conductors of a circuit rated 600 V and a circuit rated 120 V may occupy the same raceway only if
Exactly one answer is correct.
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Correct answer to question 6061
- A: All conductors have insulation rated for the highest voltage present
Explanation
Conductors of circuits with different voltages may share a raceway, cable, or enclosure only if every conductor has insulation rated at least for the highest voltage present. That rule is 300.3(C)(1) in NEC 2020 and 2023 and 300.5(C)(1) in NEC 2026. Here the 600 V circuit sets the required insulation rating for the 120 V conductors too.
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