NEC Quiz: Article 250, Part Seven Answers

by Mark Lamendola

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  1. [250.30(A)(1)]. Zero. It must be unspliced.
     

  2. [250.30(A)(2)]. The size of the derived phase conductors.
     

  3. [250.30(A)(6)]. You don't ground them. You bond them. See Article 100 definitions and 250.104(D).
     

  4. [250.30 (B)(1)]. Nothing. While the language of the NEC requires you to "ground" the equipment of an ungrounded separately derived system, that isn't what you do. Grounding won't help. If you read the actual requirements, you will see this is just an incorrect word choice in the NEC and the requirement is actually that you bond that equipment.
     

  5. [250.34]. False. Grounding it won't prevent shock. Also, the requirement to ground it exists only if the generator fails to meet two conditions that are typical of nearly every generator application (detailed in 250.34).