Re: variac

>>From davide-at-mailhost.accesscom-dot-net Mon Apr  1 01:14 MST 1996
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>Date: Sun, 31 Mar 1996 20:39:47 +0000
>From: David Euans <davide-at-mailhost.accesscom-dot-net>
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>Subject: variac
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>        I'm the proud? owner of an ancient looking 0-280 volt 28amp
>Powerstat.  It seems to work OK, but I've only tested it on a 120 volt
>line and with a light load.  On inspection, I see that the wiper
>brushes are worn and in need of replacement.  Does anyone have a
>source for new brushes or the address of Superior Electric?
>        Can this transformer be operated at higher current levels than its 28
>amp design spec?  It has a 30 amp fuse, so this will obviously need to
>go higher.  I would like to operate it intermittantly at 40-45 amps.
>Would forced air cooling help?

If you immerse it in transformer oil, you can usually double the amperage
capacity of the variac.

     Jerry Biehler, 360 S.E. Edwards St, Dundee, Or, 97115 (503) 537-2638
     jbiehler-at-teleport-dot-com    http://www.teleport-dot-com/~jbiehler
"Waking up early is not a virtue. The old saw about the early bird just
goes to show that the worm should have stayed in bed. -- Robert A. Heinlein
              -Windows '95, the best thing since New Coke.-