Most home's outlets are wired with 14-2 Romex, that supply up to 8 outlets per circuit. ... If you ran 12-2 Romex, up to a 20 amp breaker can be connected. My electrical wire was all 12-2 Romex so I just shut the main off and upped a few 15 amp breakers to 20 amp. Please be careful. If you do not know what you are doing don't do it!