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National Electrical Code Articles and Information

NEC Quiz: Article 408, Part 2

by Mark Lamendola

Quiz Questions

Code Quiz: Article 408, Part 2 of a series

Based on the 2017 NEC

Questions and answers written by Mark Lamendola, who has worked as a master electrician, electrical inspector, and design engineer. Mark is an IEEE Senior Member, and the Code article author for Since 1996, he has been writing National Electrical Code articles for electrical trade magazines and has an extensive portfolio of hundreds of NEC articles.

  1. In what order can you put DC ungrounded buses?

  2. If a switchboard, panelboard, or switchgear contains a 4-wire delta-connected system where the midpoint of one phase is grounded (thus creating a "high leg"), how must you mark it in the field?
  3. Besides the high leg system, there are four other systems that require special field marking. What are they?
  4. Finish this sentence: "Every circuit and circuit modification shall be legibly identified as to its...."
  5. What is the clearance for conductors entering bus enclosures?

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