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NEC Quiz: Article 250, Part One Answers

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  1. [250] If you answered "grounding," you got the wrong answer. Article 250 provides the requirements for grounding and bonding. That's an important distinction, because many people misapply grounding in place of bonding. This creates enormously expensive problems as well an dangers to people.
     

  2. [250.2] It's an intentionally constructed, permanent, low-impedance path for current under ground fault conditions.
     

  3. [250.2] A ground fault is an unintentional connection between an ungrounded conductor and bonded metallic objects (which the NEC refers to as "grounded," but see the Article 100 definitions of "grounded" and "bonded").
     

  4. [250.2] It's the path electricity takes in the event of a ground fault. What you want is an intentional ground fault path that directs ground fault current properly. Otherwise, the ground fault path may include people and equipment.
     

  5. [250.2 FPN] Examples include piping, metal frameworks, cable sheaths, ductwork, and other conducting bodies.

 

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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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