Ron,
Those are thick wires. How do you get the terminal to clamp down tight on such a large twisted pair?
I thnk it looks thicker than it is. I've been getting a utility cord, or something like that, at Home Depot that is just the 2 wire plug. It has a pretty thick sheath, but the internal wires are not too thick. I'm actually not sure at the moment what the gauge is because I don't have one handy.
Really the terminals for the power input are pretty big. I think they would take a much larger wire than what I've been using.
Ron