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NEC Quiz: Article 280 Answers

by Mark Lamendola

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  1. [280 and 285]. The NEC differentiates them by voltage level. In actual practice and application, they differ in several ways. For example, the kinds of devices used, the location of the devices, and the actual power ratings of the devices.

  2. [280.2]. Where the rating of the surge protector is less than the maximum continuous phase-to-ground voltage (at the power frequency) available at the point of application. Note that "available" does not mean "nominal."

  3. [280.12]. Make it as short as practical. A second rule is to avoid unnecessary bends. A third rule, not in the NEC, is to keep the bends on as gradual a radius as practical.

  4. [280.23]. It can't be smaller than 6 AWG.

  5. [280.24]. Yes, if you meet the provisions of 280.24(A) or get special permission.