I'm looking at 200.7 of the '02 code, relating to the identification of grounded counductors.
There's an FPN at the end of this section:
FPN: The color gray may have been used in the past as an ungrounded conductor. Care should be taken when working on existing systems.
So when did the NEC first specify that gray be reserved for neutral along with white?
I believe you've all said that the BOY system (with gray for neutral) has been in common use for 277/480 for at least 30 years, so I assume that we're going back a fair way.
[This message has been edited by pauluk (edited 12-08-2002).]