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National Electrical Code Articles and Information

NEC Quiz: Article 380 Answers

by Mark Lamendola

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  1. This wiring method is the multioutlet assembly. Article 380 doesn't have a section 2, so it does not define the multioutlet assembly. For that definition, we must turn to Article 100. It's a raceway designed to hold conductors and receptacles. This is kind of obvious from its name. The assembly may be assembled in the field or at the factory. It may be surface-mounted, flush, or free-standing [100].

  2. The NEC doesn't provide a list of "Uses Permitted" for this wiring method [380.10]. It simply says it's permitted in dry locations.
  3. There are six. You can't use it where concealed (with exception noted), subject to physical damage (the standard prohibition), where the voltage between conductors is 300V or more (unless it's a metal assembly at least 1.02mm thick), in hoistways, or in any hazardous location unless specifically permitted elsewhere in the NEC [380.12].

  4. Typically, this question is answered in section 30 of an Article. But Article 380 doesn't have a section 30. Basically, you have to use appropriate hardware. For a qualified electrician, figuring out what's appropriate isn't particularly challenging.
  5. This is kind of a trick question, as you don't use couplings and connectors with these. But beware of the daisy chain problem. You don't power one multioutlet assembly from an outlet in another. You can, however, use them as pullboxes [380.23(B)].



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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