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National Electrical Code Articles and Information

NEC Quiz: Article 312

by Mark Lamendola

Quiz Questions

Code Quiz: Article 312

320

Based on the 2011 NEC

320

Questions and answers written by 320320Mark Lamendola, who has worked as a master electrician, electrical 320320inspector, and design engineer. Mark is an IEEE Senior Member, and the 320320Code article author for Codebookcity.com. He is a former editor of an 320320electrical magazine were he edited Code articles.

320320
  1. 320320

    Article 312 consists of two Parts. Who is the target user of each 320320320part?
     

  2. 320320

    What's the mounting requirement for surface-type enclosures in 320320320wet or damp locations, regardless of the type of enclosure used?
     

  3. 320320

    What's the maximum setback distance from the front edge of an 320320320enclosure to the finished surface of the wall it's mounted in, if 320320320it's mounted in a wall made of noncombustible material?
     

  4. 320320

    There's a commonly violated NEC requirement that pertains to 320320320openings in enclosures. What is it?
     

  5. 320320

    The NEC requires a minimum bending space at terminals. Where do 320320320you find this space, and why is it specified?

  6. 320320
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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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