UL 1446:2019-11 Systems of Insulating Materials一 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.
2 Units of Measurement
2.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information.
3 Referenced Publications
3.1 The following standards are referenced in this standard, and portions of these referenced standards may be essential for compliance. Electrical insulation systems covered by this standard shall comply with the referenced installation codes and standards as appropriate for the country where the electrical insulation system is to be used. When the electrical insulation system is intended for use in more than one country, the electrical insulation system shall comply with the installation codes and standards for all countries where it is intended to be used.
ASTM Standards
ASTM D1676, Standard Test Methods for Film-Insulated Magnet Wire
ASTM D1932. Standard Test Method for Thermal Endurance of Flexible Electrical Insulating Varnishes
ASTM D2307, Standard Test Method for Thermal Endurance of Film-Insulated Round Magnet Wire
ASTM D2519, Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test.UL 1446 pdf download.