How do I Wire a 220V Single Phase Motor to 230-Volt 3-Phase Wiring?

By Joey Butler, eHow Contributor

 
 
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Three-phase power does not have to be complicated.

The only thing complicated about wiring a 220-volt single-phase motor to a 230-volt three-phase power system is the science behind it. Three-phase 230-volt power consists of three 110-volt waves, where any two of the power waves, when compared, peak at almost opposite times. This produces approximately 208 volts when you measure between any two wires of a three-phase system. In other words, choose any two connection points on a three-phase system, and you have sufficient voltage to power your 220-volt single-phase motor because most 220-volt motors are designed with a tolerance that allows them to operate at voltages between 200 to 240 volts.

Things You'll Need

• Double-pole circuit breaker
• 220-volt motor

Instructions

1. • 1
     Disconnect the power to the circuit box by switching the main breaker to the "Off" position.
   • 2
     Install a double-pole circuit breaker in place of the existing triple-pole breaker that powers the circuit you are using. Slide the circuit connection end of the breaker in. The hooks on this end catch behind the round bar that runs the length of the panel box. Push the end of the breaker with the slits in place. The slits will lock onto the bus bar connections.
   • 3
     Discard one of the three power wires that was connected to the triple-pole breaker. It does not matter which wire you choose.
   • 4
     Connect the two remaining wires to the terminals on the double-pole circuit breaker, and connect the motor leads to the two wires that feed back to the circuit breaker.
   • 5
     Switch the main breaker back to the "On" position and test your circuit.

Tips & Warnings

• Use a breaker with an amp capacity suitable for the circuit and motor used. Refer to the National Electric Code and the motor manufacturer's specifications.
• Check the manufacturer's specifications for your 220-volt motor to ensure it is compatible with 208 volts. Most motors are, but never assume.
• There is a great risk of electrical shock when working with high-voltage wiring.
• Only licensed electricians should attempt to alter or install high-voltage wiring.

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