Join Date: Sep 2018
Location: Cape Elizabeth, Maine
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If the transfer switch panel IS IN NO WAY connected to the main panel (highly unlikely), then what you are suggesting could be done per item A in my prior post to you. Careful attention would need to be paid to the the ground-neutral bonding in this scenario. This is how I power my small cottage on an island from a 120V generator through a small breaker panel with both hot legs joined.
However, if your transfer panel is powered from the main panel when the generator is not in use, then creating a Y connection between the two hot legs (which are normally 180 degrees out of phase with each other) is a dangerous scenario. Please don't attempt this. Return the 120V generator and get a proper 240V one and live happily ever after.
Last edited by tabora; 01-12-2019 at 05:32 PM.