Will this do?
250.119 Identification of Equipment Grounding Conductors.
Unless required elsewhere in this Code, equipment grounding
conductors shall be permitted to be bare, covered, or insulated.
Individually covered or insulated equipment grounding
conductors shall have a continuous outer finish that is either
green or green with one or more yellow stripes except as
permitted in this section. Conductors with insulation or individual
covering that is green, green with one or more yellow
stripes, or otherwise identified as permitted by this section shall
not be used for ungrounded or grounded circuit conductors.
Exceptions and Subsections
Exception No. 1: Power-limited Class 2 or Class 3 cables, power-limited
fire alarm cables, or communications cables containing only circuits
operating at less than 50 volts where connected to equipment not
required to be grounded in accordance with 250.112(I) shall be permitted
to use a conductor with green insulation or green with one or more
yellow stripes for other than equipment grounding purposes.
Exception No. 2: Flexible cords having an integral insulation and
jacket without an equipment grounding conductor shall be permitted to
have a continuous outer finish that is green.
Informational Note: An example of a flexible cord with integraltype
insulation is Type SPT-2, 2 conductor.
Exception No. 3: Conductors with green insulation shall be permitted to
be used as ungrounded signal conductors where installed between the
output terminations of traffic signal control and traffic signal indicating
heads. Signaling circuits installed in accordance with this exception
shall include an equipment grounding conductor in accordance with
250.118. Wire-type equipment grounding conductors shall be bare or
have insulation or covering that is green with one or more yellow
stripes.
(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
(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. Identification shall encircle the conductor.
(C) Flexible Cord. Equipment grounding conductors in flexible
cords shall be insulated and shall have a continuous outer
finish that is either green or green with one or more yellow
stripes.
Green and bare is OK, I don’t think red is (It could confuse someone who is paying more attention to the color than the bus it’s connected to ).