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National Electrical Code Articles and Information

NEC Quiz: Article 314, Part 6 Answers

by Mark Lamendola

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  1. At least twice the cross-sectional area of the conduit or tubing to which it is attached [314.16(C)(1)].
     

  2. Yes, but only if said body is durably marked (by the manufacturer) with its volume [314.16(C)(2)]. And it cannot be a short-radius body [314.16(C)(3)].
     

  3. Those would be Table 314.16(A) and Table 314.16(B). The first tells you the minimum volume and maximum number of conductors for a given box trade size. The second tells you the volume allowance per conductor.
     

  4. They must be adequately closed 314.17(A).
     

  5. They must be suitable for the lowest temperature-rated conductor entering the box [314.17(C)]. Also, be careful which temperature columns you use in those ampacity tables. The lowest temperature rating of any conductor brings down the temperature rating of all conductors enclosed in a box or raceway.

 

 

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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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