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NEC Quiz: Article 250, Part Seventeen Answers

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  1. [250.120(B)]. This is a trick question. A EGC isn't actually a grounding conductor, it's a bonding conductor. The NEC still has issues with correctly applying Article 100 definitions throughout the code. An aluminum EGC is not required to make a ground connection (be connected to earth). In fact, it must be terminated at least 18 inches from earth.
     

  2. [250.122(A)]. Never.
     

  3. [250.122(F)]. You must also run it in parallel. This isn't to gain additional ampacity, but for other reasons.
     

  4. [250.124(A)]. First make, first break for your EGC.
     

  5. [250.122(B)]. It must disconnect all sources of energy.
     

 

 

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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.

 

 

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