John,
The marking is a good idea, but think how confused a homeowner can get, if the branch cover 3 different rooms, the only practical way to identify would be to put circuit numbers on the outlet, but then what if they paint, or how about numbered recpt's, noe there is an idea the manufactures would love that one, give me a ivory number 4, other then requiring id, they might consider recommending the accepted approach, put it in writing.
