My eletrician wired a 120/220V 20 AMP 50-60 GFI breaker to an air tub. This is the spec called for. he used 12-2. Is this correct? Should it have been 12-3? Code requires a GFI interupter in the bath. Is there a specific GFI for 220 vs the standard 120?

 

Seems strange, but that's how they do it. The breaker looks for a perfect balance of current. If one side draws as much as 5 ma more than the other, then it trips. The assumption is that the unbalance in current is caused by an accidental path to ground.

 

My eletrician wired a 120/220V 20 AMP 50-60 GFI breaker to an air tub. This is the spec called for. he used 12-2. Is this correct? Should it have been 12-3? Code requires a GFI interupter in the bath. Is there a specific GFI for 220 vs the standard 120?

In this particular application, a 12/2 with ground is indeed acceptable. Your only load is 220V, there are no 110V components on that circuit as there would be with a dryer or some such. The GFCI functions as Beenthere has described. It will open in not more than 1/40 of a second.

Be sure to test the GFCI breaker every month. Have a licensed electrician replace it immediately if it goes bad.