Wiring 3 way switches for detatched garage lights
I don't think you can. You have two mutually exclusive choices:
1: Supply power to the garage with two hot wires, and a combined
ground/nuetral connected to earth in the garage.
This is a feeder, you cannot go to earth ground on the load side of a
service (NEVER).
By code, he must run a 4-wire feeder to the remote panel.
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