The electrical code states that a 50 HP 460 volt three phase motor draws 65 amps. The ideal amperage would be taken from the motors nameplate as different motors of the same horsepower will have different amperage's depending on what they are designed to do.
The formula you are looking for is I = HP x 746/1.73 x E x %Eff x pf. Where %Eff is the efficiency of the motor and pf is the power factor of the motor.
All that is needed is the voltage of the three-phase supply.
142 amps
The equation for amperage is Amps = Watts/Volts = 10000/240 = 41.6 amps. It is not stated if this is a motor load or not. If it is a motor load then the feeder has to be rated at 125% x 41.6 = 52 amp wire. Also if it is a motor load then the breaker will have to be 250% x 41.6 = 104 amps. A 100 amp breaker will work and still be within the electrical code ruling. Otherwise for 41.6 amps a 50 amp breaker will be sufficient.
1000 milliamperes = 1 amp. Assuming a resistive load, amps = watts / volts = .125 amps or 125 milliamperes
A 15 amp should be fine, provided that #14 wire is used for the outlet. If #12 is used, then use a 20 amp breaker. Depending on what the motor voltage is makes a difference on what the wire size is. A 3/4 HP motor draws 13.8 amps at 115 volts and 6.9 amps at 230 volts. The motor feeder conductor must have an ampacity at least equal to 125% of the full load current rating of the motor. 13.8 x 125% = 17.25 amps. The conductor required on a motor using 120 volts is #12 rated at 20 amps. The breaker for this motor needs to be rated at 30 amps.
The North American electrical code states that a conductor for a motor must be rated at 125% of the motor's full load amperage. 125% x 50 = 63 amps. A #6 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 65 amps respectively.
125%
The equation for amperage is Amps = Watts/Volts = 10000/240 = 41.6 amps. It is not stated if this is a motor load or not. If it is a motor load then the feeder has to be rated at 125% x 41.6 = 52 amp wire. Also if it is a motor load then the breaker will have to be 250% x 41.6 = 104 amps. A 100 amp breaker will work and still be within the electrical code ruling. Otherwise for 41.6 amps a 50 amp breaker will be sufficient.
Read the specification plate on the motor to determine the amount of current that the motor uses, as well as the voltage and phase. Most likely, it will be a 3 phase motor, so you can't simply connect it to your house wiring, but without sufficient information, it is impossible to tell you all of the specifics. <<>> The code book rates the amperage of a three phase 40 HP motor by different voltages. at 200 volts - 120 amps, 230 volts - 104 amps, 460 volts - 52 amps and 575 volts - 52 amps. A breaker for a motor has to be sized to 250% of the motors full load amps. Also the wire size for a motor has to be 125% of the motor full load amps.
Not normally. They are sized slightly above the LRA ( locked rotor amps) or the FLA (full load amps) stated on the motor nameplate. The startup current of a motor can be 125-150% of the running load amperage. This depends on the motor, its EFF (efficiency) and the torque requirement of the load.
1000 milliamperes = 1 amp. Assuming a resistive load, amps = watts / volts = .125 amps or 125 milliamperes
The current draw is about 27 amps. A motor feeder has to be 125% of the motors full load amperage. 27 x 125% = 33 amps. A #8 copper conductor with an insulation factor of 90 degrees C is rated at 40 amps.
The first thing you have to do is find the full load amps of the motor. The wire size feeding the motor has to be 125% of the full load current. The breaker is usually 250% of the full load current. If the voltage and amperage had been added to the question the exact breaker size could have been calculated.
If a motor 3 phase or single phase goes above the full load amps that is on the nameplate of the motor then it is in overload condition. This is usually caused by trying to drive machinery with less horsepower that the manufacturer recommends To protect the motor from this condition overload heaters are put in series with the supply voltage and the motor leads. If the current from the motor draws more that the motor's nameplate FLA then the overload heater opens the supply voltage through use of a motor contactor. The contactor can not be closed again until the motor overload heaters cool down and by the same token the motor gets a chance to cool down. This condition is rectified by either using a bigger HP rated motor or lowering the load on the machinery that the motor is driving.
125 percent of full current rating of the motor
A three phase 30 HP at 240 volts draws 80 amps. Motor feeders have to be rated at 125% of the motors full load amps. 80 x 125% = 100 amps. A # 3 copper conductor with an insulation factor of 75 or 90 degrees C are rated at 100 and 105 amps respectively. Non-time delay fusing is 225 amps, time delay fusing is 125 amps and a circuit breaker is sized by 250% x 80, the full load amps, which equals 200 amps.
To answer this question a current value needs to be given. 125000 is the product of amps times volts. I = W/E = 521 amps. So to bring 240 volts up to 125 KVA you need the circuit load to draw 521 amps.
A 15 amp should be fine, provided that #14 wire is used for the outlet. If #12 is used, then use a 20 amp breaker. Depending on what the motor voltage is makes a difference on what the wire size is. A 3/4 HP motor draws 13.8 amps at 115 volts and 6.9 amps at 230 volts. The motor feeder conductor must have an ampacity at least equal to 125% of the full load current rating of the motor. 13.8 x 125% = 17.25 amps. The conductor required on a motor using 120 volts is #12 rated at 20 amps. The breaker for this motor needs to be rated at 30 amps.
== == 125 Amps is a very heavy current load for a household circuit so this 340 ft run may be for some industrial plant or equipment... You really should know how to handle wiring size calculations already before you install that kind of stuff. To do a proper calculation, working voltage is needed, whether it is single phase or three phase and whether the wire is copper or aluminium. Single phase - 125 amps at 120 volts, copper wire #3/0, 125 amps at 240 volts, copper wire #1 Three phase - 125 amps at 480 volts, copper wire #4 ----- 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 JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.