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National Electrical Code Articles and Information

NEC Quiz: Article 328 Answers

by Mark Lamendola

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  1. It addresses Medium Voltage Cable (Type MV). [328.1]. It's a single or multi-dielectric insulated cable rated 2001V or higher.
     

  2. You can use Type MV in wet or dry locations. You can use it in raceways. You can use it for direct burial per 300.50. You can use Type MV in messenger-supported wiring conforming to Article 396. So far, it sounds like you can use it just about anywhere, but that's not quite the case.

    When using it in cable trays, you must comply with several requirements in Article 392. If you run it exposed, the installation must conform to 300.37 [328.10]. The NEC does not list all permitted uses. Essentially, you can use it anywhere it's not exposed to direct sunlight (if it's identified for that use, you can) if you have the approval of the Authority Having Jurisdiction.
     

  3. You can't use it where it's exposed to direct sunlight, unless it's identified for the use [328.12].
     

  4. That question does not have a generally applicable answer. The specifics depend upon the exact cable and the application. Type MV cannot be installed by just any electrician. Because of the voltages involved in the (intended) applications, it must be installed by people specifically qualified to install that particular cable [328.14]. This qualification typically comes from the manufacturer.
     

  5. As with the previous question, that question does not have a generally applicable answer. Type MV cable must be terminated by people who are specifically qualified to terminate that cable. They will use very specialized tools, for example electric crimpers with dies made for those specific terminations.

    And before the cable can be put into service, it must be tested by qualified test technicians [328.14]. We strongly advise working with a NETA member firm if you are installing Type MV cable. Shermco, for example, does this kind of work and does it well. Actually, if we may borrow from Carly Simon, nobody does it better.

 

 

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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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