Re: Outlet box wiring
If it's a multi-wire branch circuit (Edison circuit) there should be a tie-handle if both circuits land on the same yoke or strap. See 210.4(B) for details. Since you mention more than one panel it's doubtful there are any such circuits, but you do mention four receptacles, so maybe there are four circuits which could result in one or more multi-wire branch circuits.
If the multi-wire branch circuit does not involve split receptacles then there is no requirement for a tie-handle, nor is there even a requirment for the breakers to be on adjacent stabs. If multi-wire there does need to be 240-volt potential between the two hot legs. This is to prevent ungrounded conductor ("neutral") overload.
If it's not a multi-wire branch circuit then there needs to be a neutral wire for each hot (again to prevent neutral overload). 14-2-2 or 12-2-2 is a one good way to go for this for 15-amp or 20-amp branch circuits. This may be a non-issue. Some folks and AHJ's go with "Super Neutrals" in these situations. But, that won't work if the receptacle outlet box is served from more than one panel.
That's the best answer I have based on the minimal information given. Please check with your AHJ before relying on any opinions put forth here
Here is an example of an opinion: I agree with you that it may be a potential hazard and should be avoided when practical.
Please post more details if you require a less generic answer.
[ November 21, 2003, 08:35 PM: Message edited by: awwt ]
