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NEC Quiz: Article 408, Part 3 Answers

by Mark Lamendola

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  1. You must close them using identified closures (that certainly eliminates cardboard for this purpose) or other approved means (that certainly eliminates duct tape for this purpose) that provide protection substantially similar to the wall of the enclosure (that certainly eliminates layers of phasing tape for this purpose) [408.7].

  2. Yes, you can. But the installation must conform to 312.2 [408.16].

  3. From a Code standpoint, yes you can. But of course you should not unless there is a compelling reason to do so. And if you do so, then place them in a way that reduces to a minium the probability of communicating fire to adjacent combustible materials [408.17]. Take additional measures as feasible, for example providing a barrier or a room with positive pressure but vented to the outside away from the materials.

  4. Three feet is only the bare minimum under some conditions; under others, a greater distance is the bare minimum. See 110.26 [408.18]. Also note that the bare minimum for Code compliance may not be the optimum distance for lowest total cost of ownership. Use sound engineering judgment, accounting for specific maintenance needs and other issues.That depehes. [408.5 and Table 408.5].
  5. They must be located such that the probability of damage from equipment or processes is reduced to a minimum [408.20].