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NEC Quiz: Article 250, Part Eleven Answers

by Mark Lamendola

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  1. [250.62]. Copper, aluminum, or copper-clad aluminum.

  2. [250.64(A)]. Where in direct contact with masonry or the earth or in corrosive conditions. Don't terminate it within 18 inches of the earth.

  3. [250.64(B)]. It must be "securely fastened to" that surface.

  4. [250.64(C)]. Not normally, but yes if you meet one of two conditions specified in 250.64(C).

  5. [250.64(D(3))]. The grounded conductor (of each enclosure) and the grounding electrode system.