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National Electrical Code Articles and Information

NEC Quiz: Article 410, Part 2 Answers

by Mark Lamendola

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  1. Corrosive [410.10(B)], in ducts or hoods [410.10(C)], bathtub or shower areas [410.10(D)], indoor sports, mixed-use, and all-purpose facilities [410.10(E)], in or under roof decking [410.10(F)] .
  2. They must be constructed, installed, or equipped with shades or guards so they don't subject combustible materials to temperatures over 90 DegrC [410.11]
  3. The lampholders must be of the unswitched type. Lampholders must be at least 8ft above the floor, unless each luminaire has an individual switch or each lampholder is located or guarded so its lamp can't be damaged or readily removed [410.12].
  4. Since the NEC does not define "near", it follows that whenever 410.12 applies, so does 410.11. Remember, the goal is to prevent combustion. Don't try to interpret the rules such that you minimize what you have to do. Interpret the rules so that you do what is needed to provide a safe installation.
  5. It must be chain-supported [410.14].



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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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