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Look at the motor nameplate and it shoud have the amp draw on it. If the nameplate is missing, then the amp draw depends on what type of motor it is.
The basic calculation to get you in the ball park would be as follows:
1 HP = 0.75 KW
7.5 HP = 5.63 KW
Assume the efficiency of the motor is 80%, then the power supplied will need to be 5.63/0.8 = 7.04 KW
amp draw = 7040/220 = 32 amps
<<>>
For calculation purposes the electrical code book states that a 7.5 HP motor draws 40 amps.
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∙ 12y ago
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read the name plate on the motor
How many amperes for 3 phase 220v 5 tonner?
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Then you are trying to get more HP out of the motor that it can supply. Back off on the load that the motor is driving or put a bigger motor onto the load.
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How many amps does a 5 hp 208 volt 3 phase motor draw?
read the name plate on the motor
How many amperes for 3 phase 220v 5 tonner?
50 Amps Single Phase 20 Amps Three Phase
How many amps 50 hp 240 3 phase?
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