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I've done this to my last two garages. I think I've used 6 ga cabling (four-cunductor) and I think it is fed by a 70 amp breaker. You may need a separate ground, but my garages have not had the main panel attached to them. I did, in each instance, drive a couple of ground rods for the 'service' panel. I did not connect the ground and neutral circuits at the service panel. They are, of course, connected at the main panel.
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Man of Carbon Fiber (stronger than steel)
Mocha 1978 911SC. "Coco"
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