Running electrical to a out building
I would run three (changed to) #2 copper or #O aluminum (red or black, black, white) and one #8 copper (green for ground). Use wet location wireing e.g. THWN in conduit buried 18 inches deep.
Alternative, #2-3 (O-3 aluminum) with ground copper direct burial Romex type cable buried 24 inches deep.
Put a double wide 240 volt 100 amp branch circuit breaker in the shop panel to connect the outbuilding feed to. Have a 100 amp (or greater) 120/240 volt breaker box as a subpanel (neutrals and grounds on separater terminal strips) in the outbuilding.
Either the subpanel in the outbuilding needs a master disconnect switch or breaker up top for the incoming feed or you need a separate box next to it with heavy duty (here 100 amp) double pole switch for a master disconnect. This is in addition to the (100 amp) breaker unit in the shop building panel.
Run a #6 copper wire from the outbuilding subpanel ground bus (terminal strip) to a pair of 8' ground rods at least 6 feet apart.
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Last edited by AllanJ; 09-17-2012 at 03:31 PM.