See the 2002 NEC:
310.12 Conductor Identification
(B) Equipment Grounding Conductors.
Equipment grounding conductors shall be in accordance with 250.119.
250.119(B) Multiconductor Cable.
Where the conditions of maintenance and supervision ensure that only qualified persons service the installation, one or more insulated conductors in a multiconductor cable, at the time of installation, shall be permitted to be permanently identified as equipment grounding conductors at each end and at every point where the conductors are accessible by one of the following means:
(1) Stripping the insulation from the entire exposed length
(2) Coloring the exposed insulation green
(3) Marking the exposed insulation with green tape or green adhesive labels
[This message has been edited by Joe Tedesco (edited 06-22-2002).]
