Re: Using 240VAC on 140VAC Varic

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: humanb-at-chaoticuniverse-dot-com 

Hey Dan, all, this reminds me of something I have been
meaning to ask for some time. I have a 40 amp 115V
Variac (nice old Theater dimmer) I rebuilt last Summer,
is about 80-90 lbs, has two 12 gage wires in parallel.
I also would like to know if I could run this on a 240
circuit? I can't remember how it works, but can you
derate the current by 1/2 if you double the voltage? Or
is it more complicated than that? I have a 15 amp 220V
variac and, believe me, the old Theater dimmer has many
times its mass in the core. Would think that this guy
would take a lot before it saturated?

Thanks,

David Trimmell

On Mon, 09 Feb 2004 08:03:28 -0700, "Tesla list" wrote:

 >
 > Original poster: "Mccauley, Daniel H"
 > <daniel.h.mccauley-at-lmco-dot-com>
 >
 > Has anyone tried running 240VAC on a variac rated for
 > 0-140VAC ?
 > I know there are issues, but just curious if anyone
 > actually tried it.
 >
 > Thanks
 > Dan