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NEC Quiz: Article 250, Part Nine Answers

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  1. [250.53(D)]. 1, The continuity of the grounding (bonding) path must not rely on water meters, filtering equipment, or similar equipment (you can meet this by putting bonding jumpers around them) and 2, You have to use another grounding electrode with it.
     

  2. [250.53(F)]. 30 inches.
     

  3. [250.53(G)]. At least 8 feet.
     

  4. [250.53(H)]. 30 inches.
     

  5. [250.54]. The bonding requirements of 250.50 (or 250.53(C)), and the resistance requirements of 250.56. But that's because this is supplemental and is not to be used as an effective ground-fault current path.

 

 

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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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