How Do You Wire a Three-Phase Motor?

How Do You Wire a Three-Phase Motor?

Wiring a three-phase motor begins with turning off the circuit that supplies power to the motor. Open the motor wiring box, and check for a nameplate with the wiring information. Connect all of the wiring with the right size, and number that coordinate with the conductors you want to use. You can either use the Wye wiring or Delta wiring for a three-phase motor.

  1. Prepare the motor

    Turn off the power supply to the circuit you want to wire to the motor. Review the motor nameplate to see the manufacturer's wiring information, which acts as a guide. Wire the motor according to the voltage to which you want to connect the motor.

  2. Make the wiring connections

    Ensure to connect wire nuts of the appropriate size for the conductors used. The number of the wire nuts must also match with the number of the conductors being connected together. Cap any neutral wire in the cable supplying the motor; neutral wires are not in use. Connect the bare ends of the conductors, and twist the ends on a wire nut.

  3. Reverse the motor connection

    Swap any two-line connections to reverse the motor rotation. Move the supply line T1 to T2 and line T2 to T1. Such a connection makes the motors reverse direction, or purchase a motor control switch to accomplish the reversal.