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What size of fuse should be used for 75 hp 415v 3 phase motor connection?
Wiki User
∙ 10y ago
To answer this question, wire size is rated in the amount of amperage that it can legally carry. Fuse sizing is based on the amperage that the wire carries.
The formula to find amperage when the HP is known is I = HP x 746/1.73 x E x %eff x pf.
A standard motor's efficiency between 5 to 100 HP is .84 to .91.
A standard motor's power factor between 10 to 100 HP is .86 to .92.
Amps = 30 x 746 = 55950 = 55950/ 1.73 x 415 x .87 x .87 = 55950/550 = 101 amps.
The electrical code states that a motor conductor has to be rated at 125% of the motors full load amperage. 101 x 125% = 126 amps
A #2 copper conductor with an insulation factor of 90 degrees C is rated at 130 amps.
Fusing for this motor will be, non time delay fuse 300 amps, time delay fuse 175 amps or a circuit breaker rated at 250 amps.
Wiki User
∙ 10y ago
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What is the value of 3 phase voltage in India?
In India its 415V, 50Hz.
What is the phase current of a three phase 2.2kw 415v motor connected in star?
The line current would be the same if the motor were connected in delta. The current can be based on the rule of thumb which says 7 amps must be allowed for a 1-HP single-phase motor on 240 v. A 2.2 kW motor is three times as powerful, and on a three-phase supply of the same voltage (240/415) it would draw 7 amps.
What is the no load current of a 2.2kW 3 phase 415V AC Motor?
Divide 2.2 kW by (an assumed, because you did not state it) power factor of 0.85 to get 2.6 kVA. Divide that by 3 to get 0.863 KVA per winding. Divide that by 415 volts to get 2.08 amperes per winding. If you are running star, then that is the phase current. If you are running delta, then multiply by the square root of 3 (1.732) to get 3.6 amperes per phase.
What is LT motor?
LT motors are those motor whose voltage rating is less than 415v.
What should be the minimum insulation value of a 20 kw 415v phase motor?
415V commonly available wire is 300V or 600V so that would need to be 600V wire to use a megger or a hipot tester (2* operating voltage +1000V) 2000 volt megger or hipot should verify the wiring in this instance 2500v megger will be necessary for 600V wire and wiring devices you also must look and ambient temperature and humidity a test after some operation time can verify this
Can you run a 415v 3 phase motor on 480 3phase?
It would not be immediately dangerous but there is a possibility of overheating with the 9% overvoltage so it isn't a good idea unless the motor is lightly loaded and watched very carefully. The safe voltage range should be marked on the motor.
Power a 415volt motor with 480volts?
in low voltage connection in wye (star conncetion) 415v high voltage connection in delta 480v
What is the full load amps of a 3 phase 415v 14.7kw motor?
0.073 assuming 0.85 power factor
Can you use a 415v motor in a 240 v socket?
No you can't use a 415v motor in a 240 v socket.
What is the calculation formula for rewinding a 415v 3 phase single speed motor to 2 speed operation?
5 hp moto 1500 rpm 3 phase winding calculation
Can you convert 415v 3 phase to 230v single phase?
415V 3 phase is the line to line voltage. The line to neutral of this supply is 230V single phase. Therefore you use one of the phases and the neutral.
Can a 415V 3-phase 50 Hz motor run on 380V 3 phase 60 Hz?
Yes, it will run drawing little more extra current in similar conditions. The motor is expected to be running in lesser rpm as well.
I have a three phase device on a 415v 50 Hz supply drawing about 100 amps. If I put that device on a 380v 60 Hz supply how will the frequency difference effect the motor?
That is a big motor, 70-80 HP and you should check with an electrician. It depends on what type of motor it is and what type of load it is driving.
Can a 415v 50hz motor run on 380v 50hz?
no
What is the value of 3 phase voltage in India?
In India its 415V, 50Hz.
What is the phase current of a three phase 2.2kw 415v motor connected in star?
The line current would be the same if the motor were connected in delta. The current can be based on the rule of thumb which says 7 amps must be allowed for a 1-HP single-phase motor on 240 v. A 2.2 kW motor is three times as powerful, and on a three-phase supply of the same voltage (240/415) it would draw 7 amps.
What is the no load current of a 2.2kW 3 phase 415V AC Motor?
Divide 2.2 kW by (an assumed, because you did not state it) power factor of 0.85 to get 2.6 kVA. Divide that by 3 to get 0.863 KVA per winding. Divide that by 415 volts to get 2.08 amperes per winding. If you are running star, then that is the phase current. If you are running delta, then multiply by the square root of 3 (1.732) to get 3.6 amperes per phase.
