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NEC Quiz: Article 430, Part 9

by Mark Lamendola

Quiz Questions

Code Quiz: Article 430, Part 9

Based on the 2020 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. Part IX provides the requirements for what part of a motor installation?

  2. What are the location restrictions for installing a motor disconnecting means, if it's a separate motor disconnect?
  3. Can an instantaneous circuit breaker be used as a motor disconnect?
  4. If you have a 480V motor circuit, what is the minimum ampere rating of the disconnect?
  5. What locked rotor current value do you use for a small motor not covered by Table 430.247, 248, 249, or 250?

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