![]() Three-Phase Motors - HP and Full-Load Currents Power Overloading will over time reduce motor efficiency. Ohms law and resistance resistivity and how it affects the resistance of a. acceptable for a short-period: 20 - 120%Ī motor with a service factor can occasional be overloaded. volts, watts, amps power consumption of appliances and kilowatt hours (kWh).So kilowatts are equal to amps times volts divided by 1000: kilowatt amp × volt / 1000. For a 1 horsepower (hp) motor the load should typically be in the range 1/2 to 1 hp with maximum efficiency at 3/4 hp. The power P in kilowatts is equal to the current I in amps, times the voltage V in volts divided by 1000: P (kW) I (A) × V (V) / 1000. Note that most electric motors are designed to run at 50% to 100% of rated load and that maximum efficiency usually is near 75% of rated load. Motor efficiency must be considered to avoid undersized power supply. Be aware that the motor efficiency is not calculated in to the values for kW and amps below. ![]() ![]() Single-Phase Motors - HP and Full-Load CurrentsĪ motor of a given rated horsepower is expected to deliver that quantity of mechanical power at the motor shaft. Before using a monitor, read the user manual. 460 volts motor - 3-phase : 1.25 amps/hpĪlways check nameplate information before designing protective devices, wiring and switch gear. You can buy electricity usage monitors at most hardware stores for around 25-50.230 volts motor - 3-phase : 2.5 amps/hp. ![]()
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