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National Electrical Code Articles and Information

NEC Quiz: Article 382 Answers

by Mark Lamendola

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  1. This wiring method is the nonmetallic extension. While 380, which preceded this, doesn't have a section 2 (a rare thing), Article 382 does. There, we really find two definitions. First is for the nonmetallic extension itself. It's a listed assembly of two insulated conductors within a nonmettallic jacket or extruded thermoplastic covering. This includes surface extensions for mounting directly onto the surface of walls or ceilings [382.2].

    If it's a concealable extension, the number of conductors may be two, three, or four. That's one difference. Another is it can be in a sealed nonmetallic covering (or in (in one of the other two jacket types from the previous definition). And you can conceal it with paint, plaster, wall paper, etc.

  2. You can use it from an existing outlet on a 15A or 20A branch circuit, and only if it's exposed (or concealed as permitted in 382.15), in a dry location, and in a residential or office building no more than three floors above grade [382.10].

  3. There are four. You can't use it unfinished basements, attics, or roof spaces (that's one); where the voltage between conductors exceeds 150V (or 300V for arial cable); where subject to corrosive vapors; or where run through a floor or partition or outside the room in which it originates [382.12].

  4. Secure them in place using approve means at intervals no more than 12 inchines. Firmly anchor them to the wall using an adhesive or mechanical anchoring system identified for the use [382.30].
  5. All fittings, connectors, and devices shall be of a type identified for the use [382.42].



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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