Receptacle on 220V output of portable generator only has connection via plug of 2 hots and a ground. Can this be successfully fed into panel with a 2 pole GFI breaker, considering there is no neutral wire? Output of 2 pole GFI breaker to supply power to 220V marine equipment only. Would the neutral pigtail off the GFI breaker be terminated in the panels common bus bar (assuming the green grounding screw is installed), or does the neutral and gnd bars have to be isolated as a subpanel would be wired with the GFI breaker's pigtail winding up isolated from the gnd bar in the panel...which would be basically be tying the pigtail to the air since the generator feed would only be the two hots and the ground wire. Please advise.