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AC Electric Machinery accepted test data actual motors AIEE Transactions ambient temperatures ature based on experience bottom coil cedure CIRCUIT BREAKERS Class N insula coil ends components demonstrated equivalent dew point Electrical Insulating electrical stress equipment has demonstrated equivalent life expectancy Evaluation of Systems experience or accepted H.H. Richardson heat-aging portion humidity IEEE STANDARD TEST IEEE Std insu INSULATING MATERIALS Std insulation system lation main winding mechanical stress ment standard specifies Motor Insulation motorette natively contain materials normal obtained oven perature classification phase insulation posures preferred temperature index7 PROCEDURE FOR EVALUATION rack recognized test recommended screening tests slot insulation slot portion slot section standard specifies based STANDARD TEST PROCEDURE sulation Swampscott system may alter system utilizing materials SYSTEMS OF INSULATING temper temperature classes temperature rises test specimens thermal aging thermal shock tion system top coil uniform varnish vided that experience voltage checks VOLTAGE REGULATION water bath WIRE TO WIRE