National Electrical Code Articles and Information

Code Quiz: Article 376

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, and here we are at Article 376, "Metal Wireways."

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. Nonmetallic wireway is similar, but the main advantage of a metal one is it allows you to create a Faraday shield around the conductors. So if you have something like signal cabling, this wiring method can help "harden" it against EMI (electromagnetic interference). Note, however, this doesn't mean you can ignore proper routing and just run it right next to the supply wiring of that 400HP industrial motor. You can still get inductive coupling that way, because normal materials don't stop magnetism.

This wiring method can be a very good way to go. Just make sure 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 376 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!