A friend of mine had a pump that was running hot. I didn't think much of it, but when we were draining a good chunk of his pool to drop the CYA, we started hearing an occaisional popping noise, then the pump shut down. I little poking around revealed that the pump had been wired with 14 gauge wire 18 years ago. During the heavy load of the partial drain, we blew one of the wires leading to the pump in two! We re-wired it with 10 gauge to the breaker and it runs much cooler now and his electric bill is less.
Who knows how long that wire was running hot with excesive voltage drop. When voltage drops, current goes up, until something gives out.
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