Systems of Insulating Materials – General
1.1 These requirements cover test procedures to be used in the evaluation of Class 120 (E) or higher
electrical insulation systems (EIS) for use in the United States, and Class 130(B) or higher EIS for use in
Canada, where the thermal factor is the dominating aging factor. These requirements also cover the
investigation of the substitution of non-electrical insulating materials (NIM) components of insulation in a
previously evaluated insulation system and also the test procedures to be used in the evaluation of
magnet wire coatings, magnet wires, and varnishes.
1.2 These requirements for the evaluation of an EIS do not establish thermal ratings for/or alter
established thermal ratings for individual components.
1.3 These requirements do not cover insulation systems exposed to radiation or operating in oils,
refrigerants, soaps, or other media that potentially degrade insulating materials.
1.4 When any performance aspect of an end-product requirement is not covered by this standard, the
applicable standard shall be used.
1.5 These requirements do not cover electrical insulation systems where transient overvoltages or partial
discharge are present. Such electrical insulation systems shall be evaluated to the appropriate standard
for the application. Such standards include, but are not limited to the following:
a) IEEE C57.12.60;
b) IEC 60034-18-31; or
c) IEEE 1776.