These revisions to UL 1977 include the following changes in requirements:
AC and DC Dielectric Voltage-Withstand Test Potentials
Material RTI Indices and Temperature Test
In addition, these revisions to UL 1977 include the effective date of the requirements for Material RTI Indices and Temperature Test in 16.1 and Table 7.1. These requirements were first published with an effective date to be determined on June 9, 2010.