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National Electrical Code Articles and Information

NEC Quiz: Article 215 Answers

by Mark Lamendola

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  1. In accordance with any instructions included in the listing or labeling [110.3(B)].

  2. This isn't defined in the NEC [110.12]. But a qualified person is expected to know what this means. In many cases, the NEC will provide an occasional clarifying requirement, but don't read something that isn't there.

  3. Close them [110.12(A)]. This is one of the most common Code violations.

  4. The first is that the equipment must be firmly secured to the surface on which it is mounted. You can generally achieve this by simply using the manufacturer's mounting hardware. The second is you can't use wooden plugs as a means of mounting.

  5. Yes, but only as allowed by 110.14.

  6. The temperature rating of the connected equipment [110.14(C)(1)]. But see Annex D(2)(b) for an application where this isn't a limitation.

  7. No. Part II applies to 600V and under; Part III applies to over 600V.

  8. Yes and no. Three feet is the minimum. The NEC provides other space requirements, depending on various factors. See the tables in 110, which you will also find in OSHA Part 1926 Subpart E.  Operational, maintenance, and other considerations may cause you to provide even more space.

  9. Guard against accidental contact, guard against physical damage, and provide proper signage [110.27].

  10. They must be corrosion-resistant [110.79].


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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