How should the Bobcat 250 be grounded when mounted on a vehicle?
Connect a grounding cable from the equipment grounding terminal on the front panel to the metal vehicle frame using #10 AWG or larger insulated copper wire. Electrically bond the generator frame to the vehicle frame by metal-to-metal contact. If the unit does not have GFCI receptacles, use a GFCI-protected extension cord. (Page 17)
From the official Miller Bobcat 250 Portable Welder Generator manual, page 17
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