I ran some 8/3 wire from the basement to the attic (About 100 feet) a few years ago, planning to add a sub panel in the garage for outlets and a 220 line (30 amp). The time has come to finish the job. Can someone tell me what size breaker to put in the basement, and the size of panel in the garage? Should I have run 6/3 for the job? I do not want to buy new wire. I want to run a few circuits with 12 gauge wire for outlets, a 20 amp circuit for a fan in the family room, a 220 line for a electric heater in the family room. Any help would be helpful.