Electrical Wiring in the Home/detached garage


I'm wanting to install a 70 amp 2 space sub panel in my garage for general lighting and a garage door opener. I will be putting in one 15 amp and one 20 amp breaker. The distance is approximately 75ft garage to the home breaker panel. #1 Can i install a 30amp double pole breaker in the home breaker panel #2 Can i use 10-3 wire w/ground from the house panel to the garage panel. I know i have to install GFCI outlets in the garage and the garage door opener should be on a separate breaker(15 amp). Anything else i should know? Thanks

It's only going to be a 30 amp set up if you use a 30 amp breaker in your house.  Normally 10-3 is 30 amps, but it depends on the type of wire, etc.  Usually when you buy the wire, there should be an ampacity chart that goes with that wire. It's always best to do a reality check and make sure. If there are any other metal paths between the two buildings, such as water or telephone lines, then you would need to use a ground wire between the two boxes.  The box in the garage should have a grounding rod no matter what.
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Electrical Wiring in the Home

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Bob Sponaugle


Just about any home wiring question. (not appliance repair) I have done all kinds of home wiring for myself, including adding a new breaker box, etc. Please, questions from North America only. Please be specific with details.

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