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NEC Quiz: Article 250, Part Eleven Answers

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  1. [250.62]. Copper, aluminum, or copper-clad aluminum.
     

  2. [250.64(A)]. Where in direct contact with masonry or the earth or in corrosive conditions. Don't terminate it within 18 inches of the earth.
     

  3. [250.64(B)]. It must be "securely fastened to" that surface.
     

  4. [250.64(C)]. Not normally, but yes if you meet one of two conditions specified in 250.64(C).
     

  5. [250.64(D(3))]. The grounded conductor (of each enclosure) and the grounding electrode system.

 

 

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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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