How many amps does the compressor draw ?
How far away is the garage from the panel ?
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Ok if that's the case you can run 10/2 with ground on a 2 pole 30 amp breaker
If the compressor is hard wired and dosen't have a means of a disconnect you can install a small knife type disconnect or even a dryer cord with an outlet
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You will still need a means of disconnecting it
Yes the breaker would be ok if it were in sight of the compressor but you said it's 50 feet away
I would put a small non fuseable knife type disconnect rite next to it and pipe it to that
Shure it will look like a disconnect you see going to an outdoor a/c unit
They are approx 6x 10 inches and have a handel on them you can get them at home depot just be shure it's good for 30 amps
Yes ask for a non fusable 30 amp indoor disconnect