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[TCML] Variac ID



Is there any way I can determine whether my variac can be used for controlling 240 volts as opposed to 120?
The only markings visible on it are the name of the manufacturer; SUPERIOR ELECTRIC CO./POWERSTAT.
Perhaps measuring the excitation current?  Characteristics:  Wt 22 lbs, Wire size #14.
I didn't measure the excitation current at 120 volts, since I have nothing to compare it with.
Any help will be appreciated.  Thanks
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