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Old 10-31-2012, 09:45 PM   #1
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Help wiring a switch and plug to a 240v single phasemotor




I bought a tool from somebody without a plug and thought I would take a chance on it. I noticed a big problem taking the cover off. It looks like the white and green are reversed. There is no plug on the other side and plan on going to pick up a 240v plug. (the side wired up is going to the motor, the size with a loose wire goes to the plug).

In the switch compartment, if I hook up the green to be in line with the red wire, should I then match the white wire with the longer round prong on the plug. I am pretty sure if I hook up the 240v lines to the flat prongs it doesn't matter the order. It is also going into a residential 240 outlet that is wired correctly.

would that be correct or would there be a better way of doing it. Any information would help me out a lot.

Also is there any wrong way to incorrectly hook up the motor where it smokes or fries? a 2hp 240v motor is a bit pricy for a new one.

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Old 10-31-2012, 09:49 PM   #2
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Help wiring a switch and plug to a 240v single phasemotor


You are correct in your thinking. Hook up the white wire to = the red wire. Connect the green to the ground terminal, then attach the 240V cord end. The order of the phases does not matter for a single phase power supply.

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Old 10-31-2012, 09:52 PM   #3
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Help wiring a switch and plug to a 240v single phasemotor


thanks, but what would happen if the green and white wires were reversed and plugged in? would it work. also would there be anyway I can destroy the motor?

Last edited by da_man; 10-31-2012 at 09:54 PM.
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Old 10-31-2012, 09:56 PM   #4
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Help wiring a switch and plug to a 240v single phasemotor


If left the motor starter as is (with the white hooked up to ground and green to 120V) and wired the cord end with black and white to be the hot wires (green to ground) you would energize anything metal on the tool or that the tool is touching.

If you left the motor starter as is, and wired the cord end with black and green being your hot wires (white as your ground) the tool would work just fine. Although the NEC requires the ground to be green, green with yellow stripe, or bare.
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Old 10-31-2012, 10:59 PM   #5
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Help wiring a switch and plug to a 240v single phasemotor


If left as is the 240v motor would get 120v and either trip the breaker or smoke the motor. Likely trip the breaker after it hummed for a short bit moving either slow or not at all.
If the tool was grounded out to something else that had a direct path back to the bond in the panel the breaker would trip instantly.
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Old 11-01-2012, 06:23 PM   #6
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Help wiring a switch and plug to a 240v single phasemotor


I wired up the motor for the tool and it works great. Thanks for your help.

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