In addition to the NEC, NFPA 79's requirements for the grounding conductors and terminals:
13.2.2.1* The color GREEN with or without one or more
YELLOW stripes shall be used to identify the equipment
grounding conductor where insulated or covered. This color
identification shall be strictly reserved for the equipment
grounding conductor. GREEN shall be the predominant color
when used in combination with one or more YELLOW stripes.
Exception No. 1: Conductors with green insulation or insulation that is
green with one or more yellow stripes shall be permitted to be used for
other than equipment grounding purposes where all of the following
conditions are met:
(1) The conductor is part of a multiconductor cable.
(2) The multiconductor cable containing the conductor contains only
circuits supplied from a source limited to less than 50 volts.
(3) The multiconductor cable containing the conductor contains only
circuits supplied from a source limited to no more than a powerlimited
Class 2 energy level.
(4) The conductor is reidentified at all accessible locations, or the
multiconductor cable is part of a listed assembly
8.2.1.3.3* The equipment grounding conductor terminal
shall be identified with the word “GROUND,” the letters
“GND” or “GRD,” the letter “G,” the color GREEN, or the
symbol shown in Figure 8.2.1.3.3; in addition, the letters “PE”
shall also be permitted to identify this terminal.
8.2.1.3.4 Where an auxiliary grounding electrode
8.2.5.2* The equipment grounding conductor connecting
points, other than the equipment grounding terminal, shall be
identified by the color GREEN, by the bicolor combination of
GREEN-AND-YELLOW, or by use of the symbol shown in
Figure 8.2.1.3.3.