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National Electrical Code Articles and Information

NEC Quiz: Article 430 Answers, Part 7

by Mark Lamendola

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  1. Part VII of Article 430 provides the requirements for motor controllers. Please note, this is distinct from requirements from motor control circuits; those are in Part VI.

  2. Yes, if i t is a branch circuit inverse time circuit breaker rated in amperes [430.83(A)(2)]. You can also use a molded case switch as a motor controller [430.83(A)(3)].

  3. False [430.84]. It's controlling the motor, so only needs to shut it off. It is not interrupting current for ground fault or overload protection or to isolate the motor from its energy source. However, if it also serves as the disconnecting means then it must open all of the conductors.

  4. False. You're probably thinking of switches at a service. Each motor must have its own individual controller [430.87]. There are, however, two exceptions to this (see the Exception notes to 430.87]. For example, a branch circuit disconnecting means serving as the motor controller can serve more than one motor. Exception 2 seems to be a restatement of Condition (2) of Exception 1.
  5. You betcha. This type of motor can run fast enough to blow itself up. So can separately excited dc motors and various configurations of motor-generators and converters [430.89].



How the NEC is arranged

  1. The first four Chapters of the NEC apply to all installations.
  2. Article 90 precedes Chapter One, and establishes the authority of the NEC.
  3. Article 80 follows the body of the NEC; it exists as Annex H. It provides the requirements for administration.
  4. Chapters 5, 6, and 7 are the "special" chapters, covering special: occupancies, equipment, and conditions (in that order).
  5. Chapter 8 provides the requirements for communications systems.
  6. Chapter 9 provides tables.
  7. The appendices provide mostly reference information.
  8. Appendix D contains examples that every NEC user should study.

Try your NEC moxy:

  • Do you know the difference between bonding and grounding? Hint: Look in the NEC, Article 100.
  • Does the NEC refer to grounding incorrectly in any of its articles? Yes! So be careful to apply the Article 100 definitions. Don't ground where you should bond.
  • When doing motor load calculations, which Article covers hermetic motors? Answer: While Article 440 covers the application of hermetic motors, it does so only by amending Article 430 because hermetic motors are a special case of motors. For motor load calculations, refer to Article 430.
  • Does the NEC provide a voltage drop requirement? Yes! It does so in a special case, which is Article 648 Sensitive Electronic Equipment. But for general applications, it does not provide a requirement; it merely provides a recommendation in a couple of FPNs.
  • Take our Code Quizzes.

Remember other applicable codes, rules, standards, and references:

  • OSHA's electrical worker safety rules.
  • IEEE standards.
  • NETA standards.
  • NFPA standards.
  • International Codes (if applicable to the installation).
  • State Codes (if the state has them).
  • Local ordinances and permit requirements.
  • Local fire codes.
  • Manufacturer requirements or guidelines.
  • Customer security requirements.
  • Industry standards.
  • Your company's own internal standards, practices, and procedures.
  • Engineering drawing notes.



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