NEC Quiz: Article 215 Answers

by Mark Lamendola

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1.      [215.2(A)(1)]. Article 220. The Parts are Parts III, IV, and V.

2.      [215.2(A)(1)]. Any adjustment or correction factors (e.g., temperature).

3.      [215.2(A)(2)]. Where the feeder conductors carry the total load supplied by service conductors with an ampacity of 55A or less.

4.      [215.2(B)(1)]. The ampacity of the feeder conductors cannot be less than the sum of the nameplate ratings of the transformers supplied by those feeder conductors.

5.      [215.2(B)(2)]. The ampacity of the feeder conductors cannot be less than the sum of the nameplate ratings of the transformers plus 125% of the designed potential load of the utilization equipment that will be operated simultaneously.

6.      Article 240. See Part I, if under 600V. See Part XI, if over 600V.

7.      [215.4(A)]. True. Two or three sets of 3-wire feeders, or two sets of 4-wire or 5-wire feeders, may use a common neutral.

8.      [215.11]. It must have a grounded conductor that is electrically connected to a grounded conductor of the system supplying the autotransformer. Note that this can defeat the purpose of using an autotransformer, in many cases. If so, move it downstream in the distribution so it supplies a branch, rather than a feeder.

9.      In 200.6 and 250.119, respectively.

10.  [215.12(C)]. You must identify each ungrounded conductor by system, wherever it is accessible.