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National Electrical Code Articles and Information

NEC Quiz: Article 100, Part 2

by Mark Lamendola

Quiz Questions

Code Quiz: Article 100, Part 2

Based on the 2005 NEC

Questions and answers written by Mark Lamendola, who has worked as a master electrician, electrical inspector, and design engineer. Mark is an IEEE Senior Member, and the Code article author for Since 1996, he has been writing National Electrical Code articles for electrical trade magazines and has an extensive portfolio of hundreds of NEC articles..

1.     The NEC has a name for a circuit breaker that you can set up to trip at various values of current, time, or both, within a predetermined range. What is it?

2.     The NEC has a name for a circuit breaker where the only delay is the one inherent in the mechanism--there is no deliberate delay. What is it?

3.     The NEC has a name for a circuit breaker that has a purposely introduced delay that decreases as the magnitude of the current increases. What is it?

4.     If you can make make wires (that are in a raceway) accessible by withdrawing them from the raceway, does the NEC consider them "concealed wires?"

5.    Is there a difference between an insulated conductor and a covered conductor? If not, why not? If so, what is it?

6.    The NEC uses the phrase "conduit body." Is it referring to the ends, the connectors, or the middle length of a conduit?

7.     Is a wirenut a device used to join wires via crimp pressure, rather than solder?

8.     Is a continuous load one that runs constantly?

9.     If something  has no live parts exposed to a person on the operating side of the equipment, what do we call it?

10.  What number do you get if you divide the maximum demand of a system by the total load of the system?

Answers to this quiz are here: Answers to this quiz

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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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