40 Hp Electric Motor Amp Draw

For more reliable motor protection use the actual motor current as listed on the motor nameplate.

40 hp electric motor amp draw.

The conversion from amps a measure of electric current to horsepower a measure of power output by a motor can be done using a fairly simple formula. As a rules of thumb amps horsepower rating can be estimated to. For example let s find the current draw in amps of a 1 horsepower motor that runs at 120 volts with a 90 efficiency. Multiply the ac voltage by the motor efficiency the power factor and the square root of 3.

1 hp 0 745 kw. Thus horsepower is equal to the current in amps times the voltage in volts times the efficiency times the power factor divided by 746. This calculator will also give you motor amps and recommended breaker size starter size heater size and conduit size. Amps hp 746 v η pf thus the current in amps is equal to horsepower times 746 divided by the voltage times the efficiency η times the power factor.

Fla full load amps amount of current drawn when full load torque and horsepower is reached for the motor fla is usually determined in laboratory tests note. How to convert hp to amp ac 3 phases in only 3 step. Horsepower i a v v η pf 746. Always check nameplate information before designing protective devices wiring and switch gear.

Multiply hp horsepower by 746. The actual motor amps may be higher or lower than the average values listed above. 230 volts motor 3 phase. At 440 volts a 40 hp motor pulls about 68 amperes.

Related mobile apps from the engineering toolbox. In the calculator above fla is rla 25. 460 volts motor 3 phase. Enter the motor horsepower and voltage.

230 volts motor single phase. Use this table as a guide only. Rla running load amps current drawn during normal operation of electric motor. Example if you have 100 hp multiply by 746 and you get 74600.

Horsepower ac induction motors single phase three phase 115 volt 230 volt 200 volt 230 volt 380 415 volt 460 volt 575 volt. 115 volts motor single phase. Well sort of the definition of a horsepower for an electric motor is 746 watts. For example if there are three 15 amp motors in the circuit the ampacity rating of the wire feeding the circuit must exceed 15 15 15 1 25 48 75 amps.

The tables below are intended to be a general guide for ac motor full load amperes. Hp 200 volts 208 volts 220 240 volts 380 415 volts 440 480 volts 550 600 volts.