Can you do all the underground conduit and foundation work (remember the UFER ground), bring the pipe into the existing box, bring it up where the new box will go... and then build the wall that the new meter and main will be mounted on?
Then pull the wires through the conduit from the new meter-main to the old main, attach em to the thru-lugs, bring em into the old (still energized) box and just coil 'em up.
Then the power company comes out, moves your drop and meter, now the meter main is energized, main breaker off. Pull the supply lines off the old main breaker, connect that feeder you had coiled up to your old main breaker, double-check, and go snap the breaker in the new panel. Should light right up. Could have the whole thing done 2 hours after the PoCo leaves.
Then, build the rest of your garage.
Then pull the wires through the conduit from the new meter-main to the old main, attach em to the thru-lugs, bring em into the old (still energized) box and just coil 'em up.
Then the power company comes out, moves your drop and meter, now the meter main is energized, main breaker off. Pull the supply lines off the old main breaker, connect that feeder you had coiled up to your old main breaker, double-check, and go snap the breaker in the new panel. Should light right up. Could have the whole thing done 2 hours after the PoCo leaves.
Then, build the rest of your garage.
