320/400A service upgrade

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Otto31415926

New User
Location
Catonsville, MD
Occupation
Mathematician
Currently my residence has 150A service with and exterior mounted meter fed underground via about 80' of conduit to POCO pole. In addition there is a large completely detached garage with no power at all. I'd like to power up the garage generously to serve as double duty as a workshop. POCO did rudimentary survey and ok'd service upgrade to 320/400A service with the caveat that they "will no longer dig any lines" which I guess is a reference to how the house is fed from the xfmr on the pole. My plan is to have a 320A meter socket installed on the garage which is only 15' from the pole, and run two parallel weatherheads using RMC up to the eaves using 4/0 aluminum to feed the line side of the meter socket. Then run a 200A panel in the garage for just the garage, and a 200A disconnect for the house of of the load side of the meter, each being fed by 4/0 aluminum (seperately but joined at the meter load lugs). I'd need to run "all four" (ungrounded and grounded conductors, and EGC) to the house as a seperate building by reusing the existing conduit run that currently powers the house. I'd float the neutral at the house with a new 200A subpanel and bond the existing GEC at the house in that panel to the EGC coming from the garage. And new ground rods and GEC at the garage too. Is this plan sound? And are there any conventions about paralleling the weatherheads like how to keep the phases sorted? Thanks.

Otto
 
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