Gas fireplace installation manual call for 105c degree rating on all wiring in the unit. My feed to this fireplace will utilize 1/2 flex conduit. I have installed Southwire simpull wire which carries a thhn,mtw,awm designation. Installed in a dry location the awm is listed at 105c, ampacity of the fireplace is under 3 amps. the circuit picking up the fire place is a 20 amp general purpose circuit, simpull wires are a #12. Can I utilize the fact that its rated for 105c in a appliance wiring situation?