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National Electrical Code Articles and Information

NEC Quiz: Article 406, Part 4 Answers

by Mark Lamendola

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  1. They are as follows [406.10(B)]:
    1. Green hex terminal screw (or nut), not readily removable.
    2. Green pressure-type wire connector body (wire barrel).
    3. Green connection device, in the case of adapters.
    4. If the terminal isn't visible, the conductor entrance hole is marked with the word "green", the word "ground", the letter G, the letters GR, a grounding symbol, or a distinctive green color.

  2. Be very careful with your answer, because the literal statement in the NEC is wrong: "A grounding terminal shall not be used for purposes other than grounding" [406.10(C)]. What this literally means is you must connect that terminal to the dirt, e.g., a grounding rod (see the Article 100 definition of "ground"). what is actually meant is you connect it to the equipment grounding conductor (EGC) which is really an equipment bonding conductor.

  3. The cord must contain an equipment grounding conductor (EGC) [406.10(E)]. Read the answe to the previous question again, and think about this.

  4. There are three places 406.12]:
    1. In dwelling units in all areas specified in 210.52 (it's a long list).
    2. In guest rooms and guest suites of hotels and motels.
    3. In child care facilities.
    There are also four exceptions:
    1. Receptacles more than 5.5 ft above the floor.
    2. Receptacles that are part of a luminaire or appliance.
    3. Receptacles in a dedicated space for an appliance (or a duplex for two appliances), meeting certain conditions.
    4. Nongrounding receptacles used as replacements as permitted in 406.4(D)(2)(a).
  5. This requirement is new with the 2014 NEC. The plug/receptacle combination must be nonstandard and specifically listed and identified for each such unique combination.



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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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