According to zxcvbob :
Chris Lewis wrote:

According to zxcvbob :

If you wrap green electrical tape around both ends just up from where the
insulation is stripped, it is no longer a red wire. All the red in the
middle doesn't count.

Both the NEC and CEC prohibit this.
You can make a white wire "hot" by marking it (with tape or nail polish),
but you can't make a black or red wire into a ground or neutral.

Strange, but true.

??? Large gauge wires are only available in black and are routinely (in
Minnesota, anyway) taped white for grounded service entrance conductors.
The local inspector requires that the grounded conductor be marked.
I realize that service wires might be different than circuit wires, but
where are you gonna get white #6 wire? Or even #8?

200-6 of the NEC is very explicit in requiring that conductors No. 6 or
smaller be "identified" (marked as neutral) by a "continuous outer
finish" for their entire length. There are some exceptions, but none
would apply here.

See: http://www.ecmweb.com/ar/electric_mark_ends_conductors/ for more
detail.

It's also mentioned in the electrical wiring faq (I think) where it talks
about marking white wires black.

Not arguing, just confused. (for old work I'd tape it green even if it
was a technical violation)

I probably would too, and an inspector would probably okay it as well,
if it meets a "complying with the code imposes undue hardship" thinking that
they usually do.
--
Chris Lewis, Una confibula non set est
It's not just anyone who gets a Starship Cruiser class named after them.