Question 6062 of 871 · Maryland Journeyperson Electrician Exam
Why must all conductors of a circuit, including the neutral and EGC, be in the same metal raceway?
Exactly one answer is correct.
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Correct answer to question 6062
- B: To prevent inductive heating of the metal raceway
Explanation
Running all circuit conductors, including the neutral and equipment grounding conductor, in the same metal raceway makes their magnetic fields cancel. This prevents induced currents from heating the metal raceway. See 300.3(B) and 300.20(A) in NEC 2020 and 2023 (renumbered in NEC 2026).
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