Thermal Evaluation of Enameled Magnet Wire [includes discussion]

The thermal life of an electrical insulating system made up of magnet wire coated with a modified-silicone enamel and other silicone components has been evaluated by three different test methods. The test methods are in accordance with proposed AIEE Test Codes that have either received tentative approval or are under consideration by the appropriate AIEE committees. The results determined by each of the test methods correlate. The data presented indicate that the Dow Corning wire enamel used in these tests qualify for class H use in random-wound electric machinery.