On Sat, 02 Apr 2005 21:54:56 GMT, "Padeen"
wrote:

Aside from screwing up which leads go where, once it's connected a transfer
switch is idiot-proof - one or the other source, but not both. The biggest
problem is size, though Cooper (recently was Eagle) makes a 30 A AC DPDT
toggle switch, #3036V, that is commonly used to double-feed water heaters or
deep wells. Though that would be overrated for your app, it could handle
shore power faults.

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What you really want is a rotary cam selector switch.

For example:

http://www.cmsquick.com/prod_17_Ele.html