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How to Wire Dual-Current 3-Phase Electric Motors

A dual-current three-phase motor has two coils per phase. This generates a total of nine wires coming off the motor. These motors are used in industrial and business environments due to their power and flexibility. Wiring one of these motors can be a challenge. Be sure to read the motor installation manual and documentation before trying to wire this type of motor. Different manufacturers may label their motor differently. A common type is a WYE connected motor.

Things You'll Need

Plastic twist caps
Wire cutters
Wire strippers

Instructions

- 1
  Read all motor documentation before wiring this type of motor. Locate the wire leads of the motor. They are usually labeled "T1" thru "T9." If the motor has extra leads T10 through T12, strip a half-inch of insulation off of each of these three wires and connect them together. Cover this splice with a plastic twist cap.
- 2
  Connect wires T6 and T9 for the first phase, T4 and T7 for the second phase, and T5 and T8 for the third phase. Cover each of these three splices using three plastic twist caps. This will prevent any short circuits or safety hazards.
- 3
  Locate wires T1 thru T3. Make sure that the main power is off before connecting these wires. These are the three wires that are connected to the three-phase power supply. Connect T1 to the black power wire. Then connect T2 to the red power wire. Finally, connect T3 to the blue power wire. Since this is a WYE connected motor, it may have a white common wire, which may need to be connected to the common bar of the main power panel. Once all wires are connected, double-check all wiring before starting the motor. Once the check is complete, turn the main power back on to test the motor.

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