It sounds like you are getting a single roll of one color (black) wire.I ordered a 500 ft roll #2
IMPORTANT -- make sure your inspector/AHJ is OK with you using colored phasing tape to denote the individual conductors. In the USA the 4 wires are identified by insulation color as follows: L1 is black, L2 is red, N is white, and G is green.
I have only seen green wire used for ground. In some jurisdictions the N must be white insulation, as well. In most cases you can not use white wire for L1 or L2. There is an NEC stipulation on re-identification of wire sizes larger than #6AWG (see NEC 200.6, 250.119(A), and 210.5(C)0).
You can definitely run two black wires for L1 and L2, and put some red phasing tape around the ends of L2. I
In any case, double check your single color insulation approach with the inspector.
Below is a generator transfer switch, not a subfeed panel, but shows the 4 conductors: L1 is black, L2 is black with red phasing tape, N is white, and Ground is green.
It looks like for #2 wire you can use phasing tape (fwd to about 2:15 in)
[ame="http://www.youtube.com/watch?v=8YnC-Suw2Zs"]http://www.youtube.com/watch?v=8YnC-Suw2Zs[/ame]
and
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.
(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
Wrooster