Wiring an AC electric motor is not particularly difficult if the manufacturer's manual is available. But if the manual cannot be found, the job becomes tougher. In all cases, if you're unsure about how the motor should be connected, consult an expert as incorrectly wiring a motor can lead to a shocking hazard or injury. If the wiring schematic cannot be found, it may be wiser to purchase a new motor rather than take a chance on something that you not sure about.
Things You'll Need
- Common hand tools
- Volt ohmmeter with probes
- Electrical terminal hardware
- Terminal crimpers
- Wire caps
Be absolutely sure all electricity is removed from the motor circuitry before wiring any AC motor. Open the circuit breaker that will supply the power. Tag the breaker to ensure power will not be accidentally restored to the circuit.
Check the motor manufacturer's manual for recommendations on the correct wiring hookup for your application. If there is not a manual with the motor, look for a hook up schematic somewhere on the motor. The schematic may be on the exterior of the motor or possibly under an inspection plate or cover of the motor.
Consult the link below in the Resources section for the hook up chart for most modern motors. Find the correct wiring connections for your particular motor. For example, if the motor is single phase single voltage and you would like it to rotate in a counter clockwise direction, the chart shows that input power is connected to L1 and L2. For the CCW rotation, wires 1 and 8 are connected together and wires 4 and 5 are connected together.
Open the motor cover to access motor terminals. Strip the power wire ends and crimp on terminals. Connect the wiring to the motor terminals. Use wire caps to connect the wires together for the correct rotation.
Replace the cover and energize the motor circuit when the wiring hook up is completed. Make sure that the motor operates in the correct direction.
Tips & Warnings
- Consult the Resources section below for a link on how to attach electrical terminals.
- Use caution when working with electricity.
Electric Motor Wiring Basics
Electric motors are found in diverse machines and devices. From power drills to industrial facilities, these motors are typically composed of similar...
How to Wire a Single Phase 220 Volt Motor
Most single-phase 220-volt alternating current (AC) motors are used for residential applications in well-water pumping or air-conditioning applications. Single-phase 220-volt AC motors...
How to Wire a 110V & 220V Motor
Almost all of the modern alternating current (AC) motors found around the house and shop are dual-voltage (110–220 volts) motors. All homes...
How to Wire a Three Speed AC Fan Motor
Some high efficiency air conditioning systems use air handlers with three speed fan motors. A three speed AC fan motor's wires connect...
How to Wire a 3 Phase Motor
Three-phase motors are more efficient than single phase motors and are commonly found in applications requiring more than 7.5 horsepower. Although the...
How to Wire a Baldor Electric Motor
Baldor produces a wide range of alternating current (AC) and direct current (DC) electric motors in 26 plants world-wide. Each type of...