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NEC Quiz: Article 250, Part Fifteen Answers

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  1. [250.124(A)]. Those provided in drawout equipment or attachment plugs (and mating plugs and receptacles) must be first-make, last-break unless interlocks preclude energization without grounding (bonding) continuity.
     

  2. [250.124(B)]. Yes, but only if opening the switch disconnects all sources of energy.
     

  3. [250.126]. A green screw (not readily removable), green hex nut, or green pressure wire connector.
     

  4. [250.126]. The entrance hole must be marked with the word green or ground, the letters G or GR, or by a distinctive green color.
     

  5. [Table 250.122]. Zero. The minimum sized Equipment Grounding Conductor is 14 AWG. It can accommodate a 15A circuit. If you had a mix of 15A and 20A circuits, it would make sense to use just the larger EGC (#12) or if you have high harmonics use a #10 EGC.

 

 

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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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