By electure
See 200.6 (B)....."or at the time of installation by a distinctive white marking at its terminations".
Nope, no grey tape.
The next logical question would be why can I run gray or white conductors for Neutral but I can only mark them white with tape?
2002 NEC 200.6(B)
(B) Sizes Larger Than 6 AWG. An insulated grounded conductor larger than 6 AWG shall be identified either by a continuous white or gray outer finish or by three continuous white stripes on other than green insulation along its entire length or at the time of installation by a distinctive white marking at its terminations. This marking shall encircle the conductor or insulation.
Bob
