330 volt curcuit

Last Edited By Krjb Donovan
Last Updated: Mar 11, 2014 05:20 PM GMT


A friend need to install a 330 volt circuit in his garage. His breaker panel will accommodate the added amp load and he has six blank spaces on the panel. I have done 220 circuits using two 120 volt breakers connected by a bar. How do you do a 330 volt circuit? Three 120 volt breakers? nd what type and gague Romex do you use?




There is no such thing as 330 volt circuit in residential wiring. The power company supplies only 220/110 volts.

In commercial buildings, there is 208, 277 and 409 volts.

There theoretically may be some way to step up the voltage using a transformer, but I have never heard of this being done.


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