I believe that I wasn't too clear on my last post, so let me offer a scenario. If I had # 12/2 NM cable in a box (black and white) for a single pole switch, I have to identify the white conductor as an ungrounded conductor. Am I suppose to phase the entire length of wire or are a couple of wraps sufficient? Code Ref. please.
A couple of wraps should be sufficient IMO. Personally, I would use a sharpie.
200.7(C)(2)
2) Where a cable assembly contains an insulated conductor
for single-pole, 3-way or 4-way switch loops and
the conductor with white or gray insulation or a marking
of three continuous white stripes is used for the
supply to the switch but not as a return conductor from
the switch to the switched outlet. In these applications,
the conductor with white or gray insulation or with
three continuous white stripes shall be permanently reidentified
to indicate its use by painting or other effective
means at its terminations and at each location
where the conductor is visible and accessible