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National Electrical Code Articles and Information

NEC Quiz: Article 358

by Mark Lamendola

Quiz Questions

Code Quiz: Article 358

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..

The Chapter Three Articles on wiring methods run in multiple series. Article 350 was the last in the sets of series about metallic conduits. Article 352 starts a series on nonmetallic conduits and after this series, a series of tubing starts with Article 358.

Article 358 provides the requirements for Electrical Metallic Tubing (EMT), by far the most popular type of raceway used in commercial applications. It's not the most popular for residential applications; Non-metallic sheathed cable (Article 334) holds that honor. Industrial facilities are also typically heavy users of EMT though in some types of plants you won't find it at all.

EMT is light and, because it assembles with pressure-type connectors, relatively easy to install. You'll need to set up your tubing bender (typically, a conduit bender with a tubing shoe) but you won't need a threader because EMT isn't threaded as conduits are.

Notice the distinction just made several times between tubing and conduit. EMT is not conduit. Many people mistakenly call it conduit, but that mistake can prove costly when trying to apply the NEC.

  1. Article 358 is the twenty first in a series of Chapter 3 articles addressing specific wiring methods and the first one (of three) to address tubing. 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 conduit?

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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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