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National Electrical Code Articles and Information

NEC Quiz: Article 340 Answers

by Mark Lamendola

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  1. It addresses Type UF cable. The designation "UF" stands for Underground Feeder but you can also use this cable for branch circuits [340.1]. The cable has a nonmetallic sheath and is suitable for direct burial [340.2].

  2. Article 340 lists seven uses. Obviously, it can be used underground. But there are half a dozen other uses, including solar voltaic systems and for wiring in wet or corrosive locations [340.10].

  3. As with most wiring methods, you can't use it where it's exposed to physical damage. With any wiring method, you should assume that restriction unless the Code says otherwise.

    Methods such as rigid conduit and intermediate conduit (Articles 342 and 342, respectively) fill this particular niche, but even in those cases you want to reduce the exposure as much as is practical. Article 340 lists ten other prohibited uses, and most of those are specific types of occupancies (e.g., movie theaters) [340.12].

  4. You can use any hardware suitable to the application and to the size cable you are using. Whatever you do, don't exceed the bend radius [340.24].

  5. Article 340 doesn't specify the types of terminations to be used. You can use any types of terminations suitable to the application and to the size cable you are using.



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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