Just had a thought...
Instead of using double pole double throw switches, wire the circuit with a couple of 3 prong plugs and a single 3 prong socket that one or the other plugs into. It's simple, cheap, and guaranteed to "break before make" meaning your generator will never have a chance to fight with shore power. It would also act like a double throw double pole switch for hot, neutral, and even ground. I can't think of any safety concerns, but like I said, I am not an electrician...
Ran D.
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