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NEC Quiz: Article 430, Part 2

by Mark Lamendola

Quiz Questions

Code Quiz: Article 430, Part 2

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.

Article 430 provides the requirements for motors, including the hermetic motors that also have additional requirements covered in Article 440. Many other articles also may apply to a given motor installation. Article 430 is the largest article in the NEC.


  1. When you wish to size conductors that supply a single motor, they must have an ampacity of 125% of what value?

  2. What's the twist on this (question #1) if the conductors supply multiple motors?
  3. Are there any special rules for conductor sizing if you use capacitors with motors?
  4. The conductors supplying a continuous duty motor must have an ampacity at least 125% of what value?
  5. You must consider any motor application to be continuous unless what condition is met?

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