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The core was cardboard tube, while the ends were plastic. I had 4 or 5 layers of cable when done.

reno, I think that was why you didn't see much of a temperature rise in your experiment. So far all the other posts seem to indicate the problem arises when there's metal of any kind in the center core. Would you be willing to try again with a metal cored reel and post the results? [Linked Image]

I'm still looking for that other thread, I'll find it eventually....

Stupid should be painful.