930

*See Referenced Standards, MG 1-1.01

+In the case of motors which are furnished with thrust bearings, only that portion of the thrust bearing loss produced by the motor itself shall be included in the efficiency calculation. Alternatively, a calculated value of efficiency, including bearing loss due to external thrust load, shall be permitted to be specified.

In the case of motors which are furnished with less than a full set of bearing, friction and windage losses which are representative of the actual installation shall be determined by (1) calculations or (2) experience with shop tested bearings and shall be included in the efficiency calculations.

ambient temperature of 25°C plus the observed rated load temperature rise measured by resistance. When the rated load temperature rise has not been measured, the resistance of the winding shall be corrected to the following temperature:

Class of Insulation System

Temperature, Degrees C

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