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NEC Quiz: Article 430

by Mark Lamendola

Quiz Questions

Code Quiz: Article 430, Part 3

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. Each motor used in a continuous duty application and rated more than X horsepower mut be protected against overload by one of the means in 430.32(A); what is X?

  2. Must you provide protection for motors rated under the X value in the above question, and if so under what condition(s)?
  3. Suppose you size an overload device per 430.32(A)(1) and it's not sufficient to let the motor start. How does the NEC allow you to solve this problem?
  4. How many overload units does a three-phase motor require, and where do you install them?
  5. Suppose you have a cord and plug connected motor and individual overload protection is omitted. What is the maximum amperage rating of the attachment plug and receptacle (or cord connector)?

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