Speed to market is key in the electrical motors industry and the use of new insulating materials often determine success for a manufacturer. UL’s Short-Term Thermal Aging (STTA) Test for Motors is specifically designed to accelerate time to market for clients certifying to the UL 1004-x Series “Rotating Electrical Machines” of standards.
UL has developed an alternate insulation system evaluation method that helps motor manufacturers get to market in less than two months. The test requirements are covered in ANSI/UL/IEC 60335-1 Annex C and involves cycling the motor insulation through elevated temperatures and humidity exposures for a total of 50-days. Compliance is determined through an electric strength test and leakage current test.