Frodo,
Multiwire circuits are used every day. I have never seen a problem with multiwire circuits when installed properly. Of course, you must watch your Box fill, maintain proper grounding and most of all remember that the pigtail on the Grounded conductor is necessary because of 300.13(B)
I would not recommend using #10 wire on standard grade devices.
Bill
[This message has been edited by Bill Addiss (edited 04-15-2002).]
