An appraisal of the future of Class F insulation systems

In recent years, interest in 155°C materials and Class F insulation systems has been increasing rapidly and apparently the general feeling in the motor industry is that use of such systems will gradually increase in the future. This feeling is made obvious by the amount of research and development work being done by various organizations to create and evaluate 155°C materials. The papers in this session are good examples of the type of work being done. In addition, NEMA has established the Class F temperature limitations to be used as the suggested standard for future design. However, there also appears to be considerable uncertainty as to just what the eventual demand for Class F systems will be. The objective of this paper is to discuss some of the problems facing Class F systems and to give some insight as to whether large volume usage of such systems van be justified economically.