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Reply by Shawn Masterson

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Posted on converting a unisaw 1.5hp motor from 115 volt to 220 volt

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Shawn Masterson

1262 posts in 695 days


#1 posted 04-16-2013 12:46 AM

a lot of people think it draws less amps. This is not exactly true. If a motor draws X amps on 110 (1 leg) then it draws 1/2 the amps on 220 (2 legs). What I mean by “leg” is when you look at the wire 110 has 1 hot wire 1 neutral and 1 ground , 220 has 2 hot wires and a ground, some have a neutral. A 220 motor draws its amps from each side of the panel using the same amount of amps in total it just draws it from 2 legs not 1. It is better to run 220 because the motor runs cooler, and starts easier/faster. The wiring diagram for changing it over should be on the motor some where, and the cord will work as long as you change the plug. The plug will cost some where around $5 and the cord you have on the machine now is sized for 110 so changing to 220 the cord will be oversized. If your wanting to make the cord longer it is cheaper to buy a #12 extension cord and cut the ends off and put a 220 plug on it than to buy the wire alone. the only thing not mentioned is to make sure the starter switch is rated/setup for 220.


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