I happen to be an electrician, so maybe I can lend some info here. The lugs in most panels (transfer switch) usually are made of aluminum. When we connect copper wire to these lugs, we have to use a dielectric grease such as Nolox to prevent the reactions that causes the corrosion. This also helps with the heat in the connection as these different metals expand and contract differently. And yes, the connection should be torqued correctly. For those of you that have these large RV's I would suggest you get familiar with as much of the wiring as you feel comfortable with and check it often. But remember, DON'T HAVE ANY POWER CONNECTED. A good volt-ohm metre is very handy thing to have in your tool box. I have found some really bad problems with loose wires in my work on homes and businesses and our RV's are no different. And they take much more abuse with the roads we travel on.
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