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National Electrical Code Articles and Information

NEC Quiz: Article 332 Answers

by Mark Lamendola

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  1. It addresses Mineral-Insulated, Metal-Sheathed Cable, which is Type MI [332.2]. This cable consists of copper conductors coated by inorganic magnesium oxide powder and run inside a copper sheath (it may be a steel alloy sheath).

    The reason to run this cable is you need to withstand the high temperatures involved in a fire; so, for example, you use it for your life safety systems. You can find out more about Type MI cable at www.micable.com.
     

  2. You can use Type MI cable in eleven different defined applications [332.10].
     

  3. You can't use it in underground runs, unless you ensure it's protected from physical damage. And you can't use it where it's exposed to conditions that may destroy or corrode the metal sheath, unless you provide additional protection to prevent said destruction or corrosion [332.12].
     

  4. Before answering that question, it's worth noting that the support issue is moot if you damage the cable during installation by exceeding its bend radius [332.24]. Generally, you must support the cable every 6ft (or less) using staples, straps, hangers, or similar fittings [332.30(A)]. But you don't have to support this cable if it's fished between access points in concealed spaces of finished structures, or supporting is impractical [332.30(B)].
     

  5. You can use any terminations suitable for the conductors. You must also use an end seal fitting where the cable terminates and you must install it immediately after stripping so moisture does not enter the insulation. You must also provide insulating material to each individual conductor. And, you must use fittings listed and identified for use with Type MC Cable [332.40].

 

 

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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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