When is a conductor with green insulation, or green with one or more yellow stripe insulation permitted to be used as for other than grounding purposes?

  1. Never.
  2. When working with 6 AWG or smaller conductors.
  3. When working with a power-limited Class 2 or Class 3 cable, power-limited fire alarm cables, or communication cables in circuits operating at less than 50V where connected to equipment not required to be grounded in accordance with 250.112(I).
  4. On any circuit less than 120V.


Answer: C

The rules for identification of equipment grounding conductors are in Section 250.119 of the NEC. An exception to this rule allows you to use a conductor with green insulation or green with one or more yellow stripes for other than equipment grounding purposes, if working with power-limited Class 2 or Class 3 cables, power-limited fire alarm cables, or communication cables containing circuits operating at less than 50V where connected to equipment not required to be grounded in accordance with 250.112(I).

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.