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NEC Quiz: Article 240 Answers

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  1. [240.4(A)]. This is a trick question. Actually, you don't install OCPDs on a fire pump (see Article 695). OCPDs aren't required where interruption of the circuit would cause a hazard.
     

  2. [240.4(G)]. Yes. See Table 240.4(G).
     

  3. [240.12]. They are coordinated short-circuit protection and overload indication based on monitoring systems or monitoring devices.
     

  4. [240.30(A)(1)]. Install them in enclosures, cabinets, cutout boxes, or equipment assemblies; or
    Mount them on open-type switchboards, panelboards, or control boards that are in rooms free from dampness (and from easily ignitable material) and are accessible only to qualified personnel.
     

  5. [240.93(C)]. You can't use it if:
    1. Motors are connected on the load side of the higher-rated OCPD and on the line side of the lower-rated OCPD, and
    2. The sum of the motor full-load currents exceeds 1 percent of the interrupting rating of the lower-rated OCPD.

 

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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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