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NEC Quiz: Article 314, Part 2 Answers

by Mark Lamendola

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  1. To provide free space for all enclosed conductors [314.1]. Please note that this is the statement of the concept. What "free space" is will be made clear in the details of the requirement.

  2. Table 314.16(A) provides metal box dimensions.

  3. For nonmetallic boxes, use only those durably and legibly marked (by the manufacturer) with their volume [314.16(A)(2)].

  4. None. You don't have to make any allowance for these [314.16(B)]. You could if you wanted to, but from an engineering standpoint that is unlikely to be worth the effort.

  5. You can make a single allowance for the volume of the largest one present in the box, using Table 314.16(B).