(A) Conductors 4 AWG and Larger. Equipment grounding conductors 4 AWG and larger shall comply with
250.119(A)(1) and (A)(2).
(1) An insulated or covered conductor 4 AWG and larger 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.
Exception: Conductors 4 AWG and larger shall not be required to be marked in conduit bodies that contain no splices or unused hubs.
(2) Identification shall encircle the conductor and shall be
accomplished by one of the following:
a. Stripping the insulation or covering from the entire exposed length
b. Coloring the insulation or covering green at the termination
c. Marking the insulation or covering with green tape or green adhesive labels at the termination