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Gil,
I am not a qualified marine electrician.
I see one thing that makes me nervous. There is a potential in this system to disconnect one of the "Shore Power Cable's" (A or B). If A is disconnected you have N and L1 connected to the 240 box but no ground. If your AC cycles you will smoke your compressor motor in a hurry. If B is disconnected you have G and L2 but no neutral. The results would be similar and not pretty.
I think that you need to find a way to make sure that both G and N are always connected to the 240 box if either shore power cable is connected. Also, you need to ensure that the AC can't cycle if you only have one hot leg connected.
I have learned the hard way how expensive it can b if a 240 motor only gets 120...
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"Ventarrón"
Flying Scot # 4964
Quote:
Golf is an exercise in Scottish pointlessness for people who are no longer able to throw telephone poles at each other.
-Florence King
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