construction code books

Home | Search | About us                  Bookmark and Share

 
nec training

National Electrical Code Articles and Information

NEC Quiz: Article 378

by Mark Lamendola

Quiz Questions

Code Quiz: Article 378

Based on the 2014 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 Codebookcity.com. Since 1996, he has been writing National Electrical Code articles for electrical trade magazines and has an extensive portfolio of hundreds of NEC articles.

After a series of Articles on various raceways, from Article 350 to Article 362, the NEC jumps to Article 366. Then the normal sequence of raceway Articles resumes with Article 376, Metal Wireways." This is followed by, logically enough, Article 378, "Nonmetallic Wireways." And that is the Article this quiz is about.

This wiring method is widely used in a wide range of applications, because it's relatively inexpensive to purchase and it saves a great deal of time during installation versus most other types of wireway or raceway. Metallic wireway is similar; its main advantage is it allows you to create a Faraday shield around the conductors. Nonmetallic wireway has an advantage that metallic can't touch: it doesn't corrode. A disadvantage is you can't use it as a Faraday sheild or as a "grounding" conductor. Nor does it provide a "ground" path. While you "should" run an equipment grounding conductor inside metallic raceway, you MUST run one inside nonmetallic raceway.

This wiring method can be a very good way to go. As with the metallic version, ensure you plan all of your conductor runs out so that you select the proper size before attaching it to the panel wall or wherever it goes.

  1. Article 378 is a Chapter 3 article addressing a specific wiring method. Which wiring method does it address, and what are its defining characteristics?
     

  2. Name three permitted uses for this wiring method.
     

  3. Name the prohibited uses for this wiring method.
     

  4. What type hardware is permitted for supporting this wiring method?
     

  5. What restriction is there on using couplings and connectors with this wiring method?

Answers to this quiz are here: Answers to this quiz

See how you did!

 

Don't take your electrical exam twice

Journeyman Electrical Exam Prep | Master Electrician Exam Prep

Learn more about: Harmonics | Motors | Power Quality
 

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.

 

 

 

Master the NEC | Solve Harmonics | Become a Motor Maintenance Guru

Codebookcity is a subsidiary of Mindconnection, LLC. If you have any questions, comments, or concerns, please write to sales @ mindconnection.com. We do want your business.