variacs

• To: "'Tesla List'" <tesla-at-pupman-dot-com>
• Subject: variacs
• From: Tesla List <tesla-at-stic-dot-net>
• Date: Fri, 13 Mar 1998 10:01:52 -0600
• Approved: tesla-at-stic-dot-net

----------
From:  Jim Lux [SMTP:jimlux-at-earthlink-dot-net]
Sent:  Thursday, March 12, 1998 1:36 PM
To:  Tesla List
Subject:  Re: variacs


> From:  nick [SMTP:nick-at-erie-dot-net]
> Sent:  Thursday, March 12, 1998 10:49 AM
> To:  tesla-at-pupman-dot-com
> Subject:  variacs
> 
> Hello,
> 
> I just got back from a hamfest and picked up two varacs for 5 bucks. That
> is both for 5!  One is a powerstat 140V 9A type Q116u and the other is a
> Technipower type W5S30.
> 
> Dose anyone have any info on the technipower variac. It looks like a 120V
> 10A. I would like to know how hard I can push it with out danger. 

Do it empirically... Hook up a variable load and load the variac up until
it starts to get too warm. Figure the time constant with all the iron and
copper is probably 10 minutes or so, so don't run up the current too fast.
Give it time to stabilize at each load setting, then disconnect the power
and measure the temperature with one of those quick reading kitchen
thermometer probes. You can probably go to 100 degrees C safely(?)
depending on the insulation class.
 

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