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The formula you are looking for is I = HP x 746/1.73 x E x %eff x pf.
I = 700 x 746 = 522200/1.73 x 4160 x .91 x .92 = 522200/6025 = 87 amps.
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.
Motor feeders have to be rated at 125% of the motors full load amps. 87 x 125% = 109 amps.
A #2 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 115 and 130 amps respectively.
This wire has to have an insulation voltage rating of 5000 volts.
What else can I help you with?
How can a three phase induction motor reverse direction of travel without changing input phase?
A three-phase induction motor can reverse direction of travel by swapping any two of the three input phases. This changes the rotating magnetic field direction, causing the motor to rotate in the opposite direction. No change to the input phase sequence is required.
How do you use a one phase motor in place of a three phase motor?
To use a single/one phase motor instead of a three phase motor is possible if you have a three phase power supply as you will only need to tap one of the three phases together with neutral and an earthwire, however to use a three phase motor instead of a single phase will require the provision of three phase power supply.
Can a single phase motor be wired to a three phase soft start?
No, a single phase motor cannot be directly connected to a three phase soft start. A single phase motor requires a single phase power supply, while a three phase soft start is designed for three phase motors. Using the correct soft start for the motor type is essential for proper operation and protection of the equipment.
What is the solution for running three phase induction motor at voltage less than its rated voltage to drive full load?
The solution to this problem is to get the same size motor in HP at the correct voltage. This way the motor can correctly drive the connected full load without tripping the motor protection.
Revolving field theory of single phase induction motors?
The revolving field theory of single-phase induction motors suggests that a rotating magnetic field created by current flowing through two windings (main and auxiliary or starting winding) produces a starting torque in the rotor. This theory explains how single-phase motors can operate without the need for a separate rotating magnetic field, as in three-phase motors, by using a split-phase or capacitor start design to generate a rotating magnetic field.
Theory for brake test on three phase induction motor?
why three phase induction motor is delta connected
Is 3 phase induction motor is self starting?
Yes, that is one of the major advantages of a three-phase induction motor.
Do you need starter for 0.5HP three phase induction motor?
You never need a starter for a three-phase motor.
How do you start three phase induction motor?
Three Phase Induction Motor is self starting motor so you can start it by conneting to power lines directly if the power line capacity is sufficient.
Is a three phase induction motor self starting?
A three-phase motor has a steady rotating magnetic field generated by the stator coil, and the rotor just follows the field.
Is three phase induction motor used for hoisting device?
ya three phase squirrel cage induction motor used to hoist travel application in industrial cranes
Is three phase induction motor continue running when any of the two phase is disconnected?
This question doesn't really make any sense - any of the two phase? A three phase induction motor requires 3 phases to start - if a single phase is lost while the motor is already running then yes the motor will continue to run. A three phase motor will not start if it is missing a phase.
Full form of scim and srim in three phase induction motor?
Slip Ring Induction Motor and Squirrel Cage Indution Motor
Applications of induction motor?
A single phase induction motor is mainly used in fans.It is capacitor start capacitor run induction motor.In three phase induction motor squirrel cage induction motor is mainly used in elevators,lifts,cranes.slip ring induction motor is mainly used in electrically driven ships.
How is slip in three phase induction motor different from slip in single phase induction motor?
They are the same thing: (Nsync - N)/Nsync, or 1 - N/Nsync
How do you wire a three phase motor with capacitor start?
I have never come across a three phase capacitor start motor. Any three phase motors I have worked on are induction start.
Disadvantages of 3 phase induction motor?
One of the disadvantages of the 3 phase induction motor is that it requires a three wire supply. The other disadvantage is that the 3 phase induction motors have poor starting torque and high have in the rush currents.
