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NEC Quiz: Article 314, Part 8 Answers

by Mark Lamendola

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  1. 314.24 says it must be deep enough to allow for proper mounting of equipment and provide enough room to make conductor damage unlikely. From this subsection, you might conclude there's no specific number and it's a matter of judgment. But if you keep reading, you will find specific numbers in 314.24(A) and 314.24(B). But that's not all. See also 314.16(B) for fill calculations.
     

  2. Yes, actually. Alternatively, it can have a faceplate, lampholder, or luminaire canopy [314.25]. It must have one of these, unless the installation meets one of the three conditions of 314.25(A), (B), or (C).
     

  3. Those that are designed for a luminaire and installed per 314.23 [314.27(A)].
     

  4. The maximum weight of the luminaire it can support, if other than 50 lb [314.27(A)(1)]. There is an exception to this rule, for boxes under 6lb if you meet certain conditions.
     

  5. Actually, there is only one condition. It must be listed specifically for such use [314.27(B)]. You can't just use a wall box in the floor. If you look at a wall box and a floor box carefully, you'll see differences and what you'll see has to do with the flame path.

 

 

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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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