Hello, I posted a message about a husky air compressor. The compressor
was running for about 5 minutes and I noticed the wiring was a little
warm (room temp. + 10-15 degrees). I'm curious if 12 gauge solid is
enough for a 25ft run of 220V. The compressor draws 15amps. Is this
OK?

The run of wire is not continuous. It comes out of the panel into a
box, where it's spliced to the runway. At the end of the runway, the
compressor splices into the box.

At what wire temperature should I be concerned?

Thanks in advance.

Mike