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National Electrical Code Articles and Information

NEC Quiz: Article 406, Part 1 Answers

by Mark Lamendola

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  1. Probably. No American manufacturer will supply a receptacle to the market without its name or identification on it, because the Code requires the manufacturer's name or identification to be on it [406.3(A)]. Any other receptacle is a counterfiet item, and it's probably a fire or other failure waiting to happen. Report the counterfiet to the proper authority, and if they don't want the counterfiet then destroy it.

  2. Nowhere. Receptacles and connectors must be rated at least 15A, 125V [406.3(B)]. If you have a 10A receptacle, it's a counterfiet.

  3. This is an isolated ground receptacle [406.3(D)]. It must be used only with an equipment grounding conductor (EGC) that is "isolated" per 250.146(D). It is not, as some have mistakenly installed an IG receptacle, one that gets connnected to its own ground rod (that is a very, very dangerous set-up). If installed in a non-metallic box, the faceplate must also be nonmetallic.

  4. It must have the Controlled Receptacle Marking Symbol (see the image of it in Figure 406.3(E)).
  5. Generally for 15A0 and 20A branch circuits, yes [406.4]. But where there's no EGC and you're replacing a non-grounding type receptcle you can use a non-grounding type receptacle [406.4(D)(2)].



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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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