In the US, this rule does apply to building wiring. (EX- 3 way switch) I don't know if this apply to portable cable. I have not seen it done, but I never had the desire to pop the connectors off of cables and lookDon't know about in the US but in Canada, there is a stipulation in the electrical code that states that "white" wires not used as an identified or neutral conductor shall be marked an appropriate colour the full length you are able to. Therefore you MUST tape the white to Red or Blue in order to make sure that someone does not mistake it as a bonded conductor.
Then again I know plenty of times where this has not happened. But if you are using it for events I'd do it just in case the inspector decides to take a fine tooth comb to the crazy little things, as I HAVE seen before.
You CAN buy cable that is colour coded for different voltages, however, it can often be a special order or more expensive.
However in all honesty just go ahead with BWG cable, there are 208 specific connectors for a reason.
Don't know about in the US but in Canada, there is a stipulation in the electrical code that states that "white" wires not used as an identified or neutral conductor shall be marked an appropriate colour the full length you are able to. Therefore you MUST tape the white to Red or Blue in order to make sure that someone does not mistake it as a bonded conductor.
NEC 2011 (and later) section 402.2(C) generally rules out that sort of thing. You have to use 14-3 or similar instead of 14-2 w/ tape like we did in the old days.It may not apply for the OP's application, but if it's used for a return black (say for wiring a lightswitch, especially a 3-way) it should be marked with Black tape.
When I used to work for a commercial electrician on a three-phase job we had to relocate the wiring conduit for an elevator. When I opened the box to disconnect the wires all three wires were BLACK! Had to trace the wires and mark them because with a three-phase motor you have to have the phases in the correct order or else the motor operates in reverse.
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