I'm with John Steinke on this one, however I think the notice is a great idea.
"I run shared-neutral circuits to save on material costs, it's not a code violation, so I save where I can."
Sarcasm aside, what benefit is there in running shared-neutrals other than saving a little wire? You can sugar-coat it any way you want.
The signs are actually a very good idea. If it were possible to say something, ANYTHING, that would keep non-electricians out of distribution panels, I'm all for it. Anyone with a screwdriver can electrocute themselves, or create a fire hazard.
My personal feelings on the matter are that someone could have a fair understanding of home wiring and still not understand the importance of having breakers in the correct positions for shared-neutral circuits.
Dave
