I would like to run a sub panel out to my garage to run an 80 gal (4hp) compressor. -- I have a 200 amp shut-off panel on the outside of my house which runs to a 200 amp breaker panel in the house. I was told to think of the outside box as the "main" panel and the one in the house as a "sub-panel." So, I am essentially running a sub panel from a sub panel. - Any problems with that?
I'm thinking I'd do a 60 amp panel in the garage. The compressor would need a "dual 30A" breaker - correct? Can I still have another circuit in that panel for a 20A outlet and or a lighting circuit? Or would that require a larger sub-panel?
How many wires of what awg would I need to run from the house panel to the garage in each case?
In response to question - Total distance from indoor panel to garage panel is about 100 feet.
and, the plate on the motor says 230 volts -- 16.5 amps....
I also use a welder very intermittently that "works" on a 20a circuit.
As I continue to browse on this subject... I've learned that I can have four 6 awg wires in my 3/4" conduit... Am I correct that I will need 2 hots, a neutral and a ground running to my sub panel? At just under 100 feet, will 6 awg suffice for a 60 amp sub panel? Then the question becomes, what circuits will I be able to run out of that sub panel? My compressor, plus what?