Bob-
Youre Welcome. [Linked Image] I suggest having an elctrician come take a look at that situation. It is possible that the #10 does not run throughout the entire ciruit, which would make it dangerous to upgrade the breaker to a 20 amp or 30 amp. Someone could have tapped #12 or #14 off of it, seeing that #10 is cumbersome to work with. At any rate, I would suggest professional assistance.

Peter