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Upgrading to 400 A Service

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    Upgrading to 400 A Service

    My brother in law built a detached garage on his property that is going to eventually be a metal fab shop. He wants to have a 200 amp service to the building independent of the existing 200 amp service going to his house. We purchased a 400 amp meter socket that has a set of two service disconnects, intended to serve the two structures.

    The question I have is related to grounding and bonding. We drove a 5/8" x 8' rod at the new building. Should this be bonded to the ground rods currently serving the house? If all ground rods are bonded, where should the neutral/ground bond be handled?

    I understand that if we were running a circuit off the main panel to the detached building, that we would not bond the neutral/ground buses on the subpanel, because that bond is already handled at the main service panel. Does that logic apply to the scenario I described above, where we effectively have two separate service entrances off of the upgraded meter socket?

    Sorry in advance if this is a dumb question...

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