210.4(C)
Line to neutral loads. Multiwire branch circuits shall supply only line to neutral loads.
Exception 2.
Where all ungrounded conductors of the multiwire branch circuit are opened simultaneously by the branch circuit overcurrent device.
This exception only requires a common trip IF you are serving a line to line load using a multiwire branch circuit.
210.4(B)
Only requires a common trip when the multiwire branch circuit is supplying more than one device on the same yoke. Even then this is only for a dwelling. Anything else doesnt require a common trip.
The above scenario isnt in a dwelling so 210.4(B) is out, and no line to line loads are served so the requirement for a common trip is out as well.
[This message has been edited by DaveB.inVa (edited 06-13-2003).]
