Any Single Speed ER Series Harrington Hoist, single phase or 3-phase, could endure this cycle for 60consecutive minutes, earning its 60 min. Short Time Lifting Motor Rating.A Dual Speed ER Harrington Hoist could endure this cycle for 30 consecutive minutes on its highspeed and for 10 consecutive minutes on its low speed, earning it its 30/10 min. Short Time LiftingMotor Rating. The higher of the two speeds can endure longer operation because when the motorspeed is higher, the cooling fan speed will also be higher. Therefore, the hoist cools itself moreeffectively at a higher speed.