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NEC Quiz: Article 406, Part 4 Answers

by Mark Lamendola

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  1. They are as follows [406.10(B)]:
    1. Green hex terminal screw (or nut), not readily removable.
    2. Green pressure-type wire connector body (wire barrel).
    3. Green connection device, in the case of adapters.
    4. If the terminal isn't visible, the conductor entrance hole is marked with the word "green", the word "ground", the letter G, the letters GR, a grounding symbol, or a distinctive green color.

  2. Be very careful with your answer, because the literal statement in the NEC is wrong: "A grounding terminal shall not be used for purposes other than grounding" [406.10(C)]. What this literally means is you must connect that terminal to the dirt, e.g., a grounding rod (see the Article 100 definition of "ground"). what is actually meant is you connect it to the equipment grounding conductor (EGC) which is really an equipment bonding conductor.

  3. The cord must contain an equipment grounding conductor (EGC) [406.10(E)]. Read the answe to the previous question again, and think about this.

  4. There are three places 406.12]:
    1. In dwelling units in all areas specified in 210.52 (it's a long list).
    2. In guest rooms and guest suites of hotels and motels.
    3. In child care facilities.
    There are also four exceptions:
    1. Receptacles more than 5.5 ft above the floor.
    2. Receptacles that are part of a luminaire or appliance.
    3. Receptacles in a dedicated space for an appliance (or a duplex for two appliances), meeting certain conditions.
    4. Nongrounding receptacles used as replacements as permitted in 406.4(D)(2)(a).
  5. This requirement is new with the 2014 NEC. The plug/receptacle combination must be nonstandard and specifically listed and identified for each such unique combination.