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  • On-demand Webinar

New Approaches to Evaluate Electrical Insulation Systems

Deepen your knowledge of certification standards and evaluation of electrical insulation systems (EISs) for safety and performance through the third session of UL Solution’s complimentary three-session on-demand webinar series.

Various insulation materials that are used in electrical systems.

Watch now: New approaches to evaluate electrical insulation systems

The short-term thermal aging (STTA) test for motors helps accelerate time to market for customers certifying to the UL 1004 series of Standards for Rotating Electrical Machines. ANSI/UL/IEC 60335-1 Annex C covers the test requirements, which may involve cycling six production motors through elevated temperatures and humidity exposures for a total of 50 days at the highest aging temperature. Compliance depends on an electric strength test and leakage current test.

Webinar date 

Oct 16, 2018


In this third and final installment of our electrical insulation systems (EISs) three-part webinar series, you will learn about:
  • Short-term thermal aging.
  • Defined life thermal aging.
  • High voltage EIS.

Alternative compliance options

Full thermal aging (FTA) system adoption and chemical compatibility tests (CCTs) represent the three most common evaluations performed under UL 1446 to demonstrate compliance. However, some additional options may be available, depending on the governing end-product standard’s requirements.

Our Defined Life Thermal Aging (DLTA) certification program applies to insulation systems used in applications where the operational designed service life is 5,000 hours or less. This certification program offers an alternative to the full thermal aging program and evaluates an EIS with a design life of 1,500, 2,500, 4,000 or 5,000 hours.

We offer high-voltage (HV) evaluations similar to the FTA evaluations mentioned above but specifically designed to address the performance of HV form-wound rotating machinery and HV power and distribution transformers. Actual form-wound coils or transformer coils undergo these tests per globally recognized IEEE or IEC standard test methods.


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