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Re: variac

>>From davide-at-mailhost.accesscom-dot-net Mon Apr  1 01:14 MST 1996
>>Received: from mailhost.accesscom-dot-net (ux.accesscom-dot-net [204.181.176.2])
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>><tesla-at-grendel.objinc-dot-com>; Sun, 31 Mar 1996 19:47:42 -0700
>Date: Sun, 31 Mar 1996 20:39:47 +0000
>From: David Euans <davide-at-mailhost.accesscom-dot-net>
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>To: tesla-at-grendel.objinc-dot-com
>Subject: variac
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>
>Hi,
>
>        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.

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