is my unisaw wired for 120 or 220?

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Forum topic by cedarmannan posted 11-24-2012 06:20 PM 1972 views 0 times favorited 6 replies Add to Favorites Watch
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5 posts in 2035 days

11-24-2012 06:20 PM

Topic tags/keywords: unisaw bullet motor wiring

Hello, I just got a 1963 unisaw and i have yet to power it up. the guy i got it from said it is wired for 220v single phase. i took the switch cover off and see a green white and black wire. which i associate with 120v. i can not easily get to the J-box on the motor to see what wires go to what in there, but i know that coming from the motor to the switch is green white and black. here are some pic’s of the plate on the motor. I also can not make out the 220v wiring vrs the 120v wiring to even see what is supposed to be hooked up in the Jbox on the motor…. any info would be supper great!!!

6 replies so far

View Fred Hargis's profile

Fred Hargis

4999 posts in 2518 days

#1 posted 11-24-2012 06:41 PM

A green/black/white wired can be (and is) used for both 120 and 240V configurations. A better clue would be what kind of plug is on the saw. A 15A 240V plug will have the 2 flat stabs in going sideways to what a 120V plug would (horizontal vs. vertical) if it has a 20A 240V plug, it will have the right stab (as you look directly at them) will be vertical, and the left will be horizontal. The motor plate indicates that the motor is convertible. Know this, if it’s properly wired 240V, the plug will not fit a 120V outlet!

-- Our village hasn't lost it's idiot, he was elected to congress.

View cedarmannan's profile


5 posts in 2035 days

#2 posted 11-24-2012 07:14 PM

Thanks for the info. I contorted my head through the dust door and was able to take the lid off of the Jbox on the motor and it is wired for 220v. the wires are quite aged, but i can make out that the red and yellow are wire nutted together and green and black out of the motor connect to black and white on the cord and the green (ground) on the cord goes to a nut in the jbox (grounded to the motor case)

now my question is i want to plug this thing into the outlet that my clothes dryer is plugged into. not a the same time of course. the dryer outlet is the only 220v outlet i have just now. inside the dryer outlet i have red, black and white. hot hot and neutral. ground comes into the outlet and goes strait to a ground screw, but not the the outlet where i want to plug into. can i connect the ground wire in my cord from the saw to the neutral in the dryer outlet? or should i attach a second J’box to the side of the dryer Jbox and hook up red black and ground to my plug? basically should my saw plug into hot hot and neutral, or does it need hot hot and ground.

thanks a ton!!!

View Fred Hargis's profile

Fred Hargis

4999 posts in 2518 days

#3 posted 11-24-2012 07:23 PM

I would bet you’ll find that dryer white is connected to ground rather than neutral. Generally, a dryer wired with neutral will have 4 stabs on the plug, the 4th being the neutral. While connecting the saw ground to the dryer neutral (if that’s what it is) will work….I’m pretty sure there are a huge number of folks who can cite all the reasons not too, as well as what section of code it violates.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Lee Barker's profile

Lee Barker

2170 posts in 2876 days

#4 posted 11-24-2012 10:51 PM

Providing you had the amperage, would it be simpler in the long run to rewire it to 110?



-- " his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

View MonteCristo's profile


2099 posts in 2214 days

#5 posted 11-25-2012 07:39 PM

This should be as simple as looking at the cord end, as a 220V plug end (likely 15A) will not be like a 110V cord end.

Failing that, I would strongly suspect it is a 220V saw, especially if the motor is about 3HP. You can’t get 3HP out of 110V without a ton of amps . . .

-- Dwight - "Free legal advice available - contact Dewey, Cheetam & Howe""

View Carl Webster's profile

Carl Webster

82 posts in 2823 days

#6 posted 11-26-2012 12:20 AM

If it was my saw and I expected someday to have a dedicated 220 (240 Volts) receptacle (circuit) for the saw I would fabricate and extension cord with a 220 Volt dryer plug and a receptacle on the other end that the 220Volt saw plug would plug into.

-- Carl in SC

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