As Curt noted above, try to determine that the wiring is 10-2 all they way to the panel, meaning there isn't some 12-2 spliced in there somewhere, if you can. Once you determine the run is 10-2 (or greater), you can install the 30 amp CB. Remember, the CB's job is to protect the wiring, not the appliance. A 30 amp CB will provide proper overcurrent protection for #10 wiring.

As to the Larry's post, we're all assuming the cable is 12-2G, meaning there is an uninsulated ground wire in there also.

Radar


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