Re: Run a 120v variac on 240???

Okay, on a similar, but opposite, note, how many amps, at 120V 60Hz,
could a 220V 10A 50Hz variac handle? At a 2200VA rating, I would think at
least 20A, but the the 50Hz rating will allow it to carry even more
current at 60Hz, won't it?

I have two, and might like to gang them to control a potential
transformer or small pig in the future...

This is an interesting variac...
nameplate reads:
Variatore Di Tensione
(lic. General Radio Co.)
Ing. S. & Dr. Guido Belotti
Piazzo Trento 8- Milano

I don't speak Italian, but I can guess what most of that means.

With Silent Lightning in my hands,
-The Electrophile-
Grayson Dietrich,  Medina, OH
See my HV Haven (it does NOT do jusctice!)

On Thu, 08 Jul 1999 16:47:05 -0600 Tesla List <tesla-at-pupman-dot-com> writes:
>Original Poster: FutureT-at-aol-dot-com 
>In a message dated 99-07-08 05:29:47 EDT, you write:
><< Hi everyone,
>>     I got to thinking again, shame on me, and thought what would
>> happen if I ran my 120v 20A Powerstat on 240v. It's rated at 2500va
>> so that would limit me to 240v -at- 10A. There is probably some reason
>> that I can't think of right now why this can't be done.  >>
>If you apply 240 volts to a 120 volt powerstat, the core will 
>and the unit will draw too much current and heat up, and probably
>burn up.  (I've never actually tried it, and I don't intend to.)  For 
>core size, there can't be over a certain amount of volts per turn.  
>For a
>given core size, a 240 volt variac is built with a greater number of 
>to take care of this.  This applies to any transformer, and explains 
>you can't apply 240 volts to a 120 volt NST (for example).  (not 
>toasting it anyway).
>John Freau

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