Hi all. I'm thinking about installing a 2 breaker sub-panel in my attached garage, so I can expand the number of outlets and add additional light switching options. I was looking at using a 20-amp breaker for the outlets, and a 15-amp for the lights. My initial thought was to use a 40-amp double pole breaker in the main panel to feed the sub-panel. I'm wondering if I can get away with using a 30-amp feeder, or should I stick with a 40-amp. And, what type of wire gauge would be appropriate for each? Thanks.