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National Electrical Code Articles and Information

NEC Quiz: Article 300, Part 3 Answers

by Mark Lamendola

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  1. [300.6(A)]. With a corrosion resistant coating inside and outside.
     

  2. Condensation.
     

  3. [300.7(A)]. Use an approved sealing method to prevent the circulation of the warm air to a colder section.
     

  4. [300.7(B)]. Yes. Use expansion fittings where necessary.
     

  5. [300.8]. Yes. Don't run anything but your electrical system in those. While the speaker wire is probably not going to hurt (although does add to raceway fill), it's not part of your electrical system. Where things really become unsafe is where installers run steam, water, gas, or other kinds of service in electrical raceway. If you see such an installation, immediately bring it to the attention of the responsible parties. If they won't act responsibly enough to correct this, then don't work in that area. Notify the AHJ so that corrective measures can be enforced before people start dying.

 

 

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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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