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I'm at work and I just went to my wire room and pulled some sil-s-blend wire and looked. It is a 200 degree rated wire. And looking at the charts, 200 degree insulation on one conductor in free air with an ambient air temp of 40 degrees C (104 F) even a #8 wire has a current rating of 124 amps.

For your wire you should easily be able to get by with a #4 or even smaller....yes I said smaller. The big thing you need to remember with the ratings of the wire is that this application is what would be considered "in free air". Meaning the ambient air temp around the wire will dissipate the...