scope:

Guiding principles are included for the development of test procedures for

 - Thermal evaluation of electrical insulating materials (EIM)

 - Thermal evaluation of electrical insulation systems (EIS)

- Thermal classification 1 of EIS for rating electric equipment The principles are presented in the following order:

- Clause 4, General concepts

- Clause 6, Evaluation of the thermal capability of EIM

- Clause 7, Limiting temperatures and their measurement for EIS

 - Clause 8, Thermal evaluation of EIS

In the application of these principles, variations are necessary to suit the widely different types of equipment and service conditions that are considered in equipment standards. When specific equipment, IEEE, or other recognized standards based on these principles are available, they should take precedence over this recommended practice.