Section 5 Part Section 6 5 Part of 567 6 Page 566 Page 05/08 1 Application Manual for NEMA Motors Date 09/07 Application Manual for NEMA Motors Temperature Rise Standards When operated at rated voltage and frequency, the temperature rise of the motor windings, above the ambient temperature should not exceed the values in the following table. Note that separate values are given for motors with a 1.0 service factor and 1.15 service factor. The values given in the table for 1.0 service factor are for motors operated at rated load or nameplate horsepower. The values given for 1.15 service factor are for motors operated at service factor load. Maximum Winding Temperature Rise °C 1.0 Service Factor Insulation Class A B F H 60 80 105 125 1.15 Service Factor A B F 70 90 115 Temperature rise values are by resistance method of determination when operated on a 60Hz utility sine wave. Temperature rise values are based on a reference ambient temperature of 40°C.