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National Electrical Code Articles and Information

NEC Quiz: Article 324 Answers

by Mark Lamendola

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  1. It addresses Flat Conductor Cable (Type FCC).  Belden defines Flat Conductor Cable as "A flat cable with a plurality of flat conductors." A Flat Cable Assembly (Article 322) is a flat cable cable integrated with connectors (thus making it an assembly).

    The NEC distinguishes between these two wiring methods because if you're installing a system in the field then Type FCC involves attaching your own connectors, while Type FC means plugging them in.
     

  2. You can use them for general-purpose branch circuits, appliance branch circuits, and individual branch circuits [324.10]. It sounds like you can use them for branch circuits, period.
     

  3. There are four: where exposed to corrosive conditions (unlike for FC, "unless suitable for the application" does not apply"), in any hazardous (see Chapter 5) location, outdoors (or in wet or damp locations), and in residential, school, or hospital buildings [324.12].
     

  4. That's a trick question. You do not support it with staples. You must secure and support flat cables using an adhesive or mechanical anchoring system identified for the use [324.30].
     

  5. Use connectors identified for the use. Install them such that you provide electrical continuity, insulation, and sealing against dampness and liquid spillage [324.40(A)]. This requirement excludes (from acceptability) such things as soldering extensions onto the flat cable conductors. That practice is mentioned here because electronics technicians sometimes mistakenly apply their techniques to 50V and higher power circuits.

 

 

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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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