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NEC Quiz: Article 250, Part Seventeen Answers

by Mark Lamendola

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  1. [250.120(B)]. This is a trick question. A EGC isn't actually a grounding conductor, it's a bonding conductor. The NEC still has issues with correctly applying Article 100 definitions throughout the code. An aluminum EGC is not required to make a ground connection (be connected to earth). In fact, it must be terminated at least 18 inches from earth.

  2. [250.122(A)]. Never.

  3. [250.122(F)]. You must also run it in parallel. This isn't to gain additional ampacity, but for other reasons.

  4. [250.124(A)]. First make, first break for your EGC.

  5. [250.122(B)]. It must disconnect all sources of energy.