A test procedure (Combination of IEEE Std 275^TM-1992 and IEEE Std 429^TM-1994) for comparing two or more insulation systems in accordance with their expected life at rated temperature is outlined. The procedure is limited to insulation systems for alternating-current (AC) electrical machines using form-wound pre-insulated stator coils rated 15 000 V and below.

This recommended practice outlines test procedures for comparing two or more unsealed or sealed insulation systems in accordance with their expected life at rated temperature. The procedure is limited to insulation systems for AC electrical machines using form-wound pre-insulated stator coils rated 15 000 V and below. The intent of this test procedure is to evaluate unsealed insulation systems for use with air cooling under usual (normal) service conditions, or sealed insulation systems for use under severe environmental conditions (where the insulation is exposed to conducting contaminants). This procedure does not cover special requirements, such as those ...

The purpose of this procedure is to classify unsealed or sealed insulation systems for the machinery used inusual (normal) service or machinery used in severe environmental conditions (and falling within the scope of this recommended practice) in accordance with their temperature capabilities by test, rather than by chemical composition. Data from such tests may be used to establish the temperature classification of new insulation systems before they are service-proven. In order to provide data from which a base of reference for temperature classification can be established, service-proven (reference) unsealed or sealed systems should also be tested accordin...