What is more important for amperage rating wire size or insulation temperature rating?

Answer 1

Wire size determines how much current can be safely conducted. Insulation type and rating determines other factors, such as where the wire can be used and maximum voltage.

It should be noted that the high voltage lines that are hanging from the really large electrical towers are among a class of wires that have NO insulation around the outside of the wire. They are instead, connected to the towers with large insulators that prevent electrical energy from being lost through the towers.

Answer 2

Both wire size and insulation temperature rating are important for determining the amperage rating of a wire. The wire size helps to determine how much current the wire can carry without overheating, while the insulation temperature rating ensures that the wire can handle the temperature generated by the current passing through it. Both factors work together to determine the overall amperage rating of the wire.