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National Electrical Code Articles and Information

NEC Quiz: Article 314, Part 1 Answers

by Mark Lamendola

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  1. Where raceway or connectors requiring locknuts or bushings are to be connected to the outside of the box [314.2].
     

  2. Only where you have open wiring on insulators, concealed knob and tube, cabled wiring methods with entirely nonmetallic sheaths, flexible cords, and nonmetallic raceways [314.3]. There are two exceptions. You can also use these where you have internal bonding means or integral bonding means that meet the specific requirements of Exception 1 or 2.
     

  3. Bond them per Article 250 [14.4]. Read the Article 100 definitions of grounding and bonding, and understand that the main purpose of bonding metallic objects in an electrical system is to eliminate differences of potential between them. The bonding system also provides a low impedance path for undesired current to travel so it can get back to the source without going through motor bearings, people, or other un-preferred paths.
     

  4. Install them to prevent moisture from entering or accumulating within [314.15].
     

  5. Per Informational Note 2 of 314, see 300.6 and follow those requirements.

 

 

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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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