Is there anything in the code that prohibits using a 120/240V residential type generator where the electrical system is 120/208V-3PH-4W? Normal feeder would be 120/208V-1PH, and generator load would be 120/240 1PH. Transfer switch would be 208-600V rated. Panelboard voltage would switch between 208 and 240, can nameplate be 120/240-1PH-3W. Of course, we'd have to check ratings of connected loads, but most would be 120V receptacle circuits. should neutral be switched to make generator a separately derived system?