Electric Motor Service Factor Amps

The americas water systems group serves north and south america.

Electric motor service factor amps.

Franklin electric offers a full line of pumping systems to serve a wide variety of clean water applications. The reference point is a service factor of 1 which would mean a motor cannot operate over its rated horsepower or hp without overheating. Dc motors full load currents full load amps in 120 and 240 volts dc motors. The service factor sf is a measure of periodically overload capacity at which a motor can operate without damage.

For example many motors will have a service factor of 1 15 meaning that the motor can handle a 15 overload. If it is a 1 0 you can run a motor to 100 load if it is 1 15 then it can be loaded to 115 of its rated load. Most motors have a duty factor of 1 15 for open motors and 1 0 for totally closed motors. Traditionally totally enclosed fan cooled tefc motors had an sf of 1 0 but most manufacturers now offer tefc motors with service factors of 1 15 the same as on odp motors.

Electric motor wiring 480 volt electrical motor wiring data nema amps starter size hmcp size for motors ranging 1 2 to 500 hp. Service factor amps is the amount of a periodic overload at which a motor can operate. For example the maximum motor load for a 1hp electric motor with a service factor of 1 15 is. A motor with a 1 15 service factor can be expected to safely handle infrequent loads to 15 past it s rated horsepower.

The nema national electrical manufacturers association standard service factor for totally enclosed motors is 1 0. To most it seems quite simple. Electrical electrical units amps and electrical wiring wire gauge and awg electrical formulas and motors. Typical service factors sf for ac motors.

Service factor is an indicator of the amount of overload a motor can be expected to handle for example a motor with a 1 0 service factor cannot be expected to handle more than its nameplate hp on a continuous basis. Motor service factor is probably the most misunderstood value on a motor nameplate. A motor operating continuously at a service factor greater than 1 will have a reduced life expectancy compared to operating at at its rated nameplate horsepower. In the u s the defacto standard for ac motors is the nema standards.

1 15 x 1 1 15hp anything above this load will certainly result in motor overheating and consequent damage of the ac motor. A service factor or sf is a factor representing the capacity at which a motor can operate without overloading or damaging its core or components. The service factor amperage is the amount of current that.