A multiplier applied to the rated horsepower of a pump motor to indicate the percent above nameplate horsepower at which the motor can operate continuously without exceeding its allowable insulation class temperature limit, provided that other design parameters, such rated voltage, frequency and ambient temperature, are within limits. A 1.5 hp pump with a 1.65 service factor produces 2.475 hp (total horsepower) at the maximum service factor point (ANSI/APSP/ICC-15 2011).
