I think that a label is an easy, inexpensive way to provide an extra margin of safety.
Last week I hooked some machinery up. I connected the transformers as 240V 3Ø corner grounded deltas, which to some could be quite confusing. (the vendor's technician had never heard of such a thing, although it was his company that requested a grounded supply system).
Labels to identify this cost about 40 cents apiece, and took me less than 5 minutes to make.
Well worth the effort, I say.
As to a homeowner making modifications to his system, if we were to label all the possible misteaks they could make, there would be no room left for anything but labels.
I love residential multiwire branch circuits. 2 wire branch circuits just waste wire and create more heat. As Roger said above, there isn't any issue with power quality (harmonics) on a 1Ø 3Wire system...S
[This message has been edited by electure (edited 10-04-2004).]
