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National Electrical Code Articles and Information

NEC Quiz: Article 312 Answers

by Mark Lamendola

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  1. Part I is for the electrician, installer, or other person involved in selecting and installing cabinets and boxes. Part II is for the manufacturers of those components.
     

  2. You must place or equip it so as prevent moisture from accumulating inside it, and you must mount it at least 6mm (1/4") from the mounting surface [312.2].
     

  3. The maximum distance is 6mm (1/4") [312.3].
     

  4. Openings through which conductors pass shall be adequately closed [312.5(A)]. That rule holds, even if no conductors are actually present in the opening.
     

  5. You'll find the space requirements in Table 312.6(A). Every conductor has a maximum bend radius; bend a conductor too severely, and you damage its insulation. By allowing enough room at terminals, an electrician can terminate wires without being forced to exceed the bend radius.

 

 

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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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