How may amps does a 240 volt 15 hp motor draw?

Answer 1

46A

Answer

As 15 horsepower is the output power of the machine, you will need to know its efficiency at that output in order to determine its input power. Without that information, you cannot determine its current draw.

Answer 2

first of all convert 5hp to wattage

since 1hp=745.7watts;then 5hp=5*745.7=37285watts=3.7285KW

Thus;power=current*voltage

3.7285=I * 240

therefore; I=3.7285/240

=0.015535A

=15.53mA

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At the risk of being chastised by an administrator, I'd like to comment on the math above.

IF YOU CANNOT DO THE MATH, DON'T ANSWER MATHEMATICAL QUESTIONS.

First, 5 times 745.7 is 3728.5.

Second, you do not convert this to KW before plugging it into the equation,

power = current * voltage. So the proper equation is 3728.5 = I * 240.

Solving this equation gives you 15.54 AMPS, not mA.

Answer for USA, Canada and countries running a 60 Hz supply service.

However (yes, it gets better) the NEC shows that this motor would use as much as 28 amps at full load (FLC). The 5hp is a RATING and as we all know, ratings are always based on one or more assumptions and we can see that full load is obviously not one of them.

The NEC requires that CONDUCTORS for this motor be sized for no less than 35 amps (125% of FLC), and that this motor not be connected to an INVERSE TIME BREAKER larger than 70 amps (250% of FLC). This motor might be successfully operated on 10 AWG wire. Yes, 10 AWG wire will carry 35 amps, though it cannot be placed on a breaker larger than 30 amps.

As you can see, sizing a circuit for a motor is a complicated process. There are short cuts to this process but there is only one right way.

Properly installing a 5 horsepower, 240v motor requires a competent electrician.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

Answer 3

around 43 amps , single phase(regular house power) 240volts