The insulation system includes a series of wires in electrical equipment. The insulation system includes electrical components that are divided into classes based on their temperature ratings. It is important to avoid subjecting the insulation system components to temperatures above their recommended operating levels. Otherwise, the motor’s insulation can start to deteriorate. This can cause the surrounding components to wear out more quickly than normal. It also subjects the motor to electrical stresses caused by partial discharge. Motors used at every 10ºC rise over the recommended rating will have their expected lifetime significantly reduced, sometimes up to 50%.