Re: Marking of wires
'02 reference:
250.119 Identification of Equipment Grounding Conductors.
(A) Conductors Larger Than 6 AWG. An insulated or
covered conductor larger than 6 AWG copper or aluminum shall be permitted, at the time of installation, to be permanently identified as an equipment grounding conductor at each end and at every point where the conductor is accessible.
Identification shall encircle the conductor and shall be accomplished by one of the following:
(1) Stripping the insulation or covering from the entire exposed length
(2) Coloring the exposed insulation or covering green
(3) Marking the exposed insulation or covering with green tape or green adhesive labels
The '05 has changed this alittle, but this is mostly the same requirement.