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National Electrical Code Articles and Information

NEC Quiz: Article 100 Quiz, Part 2, Answers

by Mark Lamendola

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All answers are from Article 100.

1.     An adjustable circuit breaker.

2.     An instantaneous circuit breaker.

3.     An inverse time breaker.

4.     Yes. Whether you can withdraw them doesn't matter. They are in the raceway, so they are concealed.

5.     Yes. An insulated conductor is encased within a material of composition and thickness recognized by the NEC. A covered conductor is encased within a material of composition and thickness not recognized by the NEC.

6.     It's not referring to any of these. A conduit body is a separate portion of a conduit or tubing system that provides access through a removable cover or removable covers. This definition does not include sheet metal boxes.

7.    No. Wirenut is a trade name (and it's always capitalized) registered to the Ideal Corporation (headquartered in Illinois). We call this device a solderless pressure connector.

8.    No. A continuous load is one runs for 3 hours or more.

9.    We call it a dead front.

10.  The number you get from this calculation is the demand factor.


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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