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How are 240 VAC variacs made?

To: tesla-at-pupman-dot-com
Subject: How are 240 VAC variacs made?
From: "Tesla list" <tesla-at-pupman-dot-com>
Date: Sat, 28 Feb 2004 18:46:00 -0700
Resent-Date: Sat, 28 Feb 2004 19:01:21 -0700
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Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com> 

How are 240 VAC variacs made? Since the feed you get from your pole pig is
240 VAC center tap, are they really 2 120 VAC variacs with linked shafts and
aligned rotor contacts? I dont see how you get it to work if it wasnt
because the rotor contact would be a potential to either side of the line
but would really be pulling from only one half on the transformer and
essentially feeding it with 120 VAC although it would be able to deliver
0-240 VAC.

---Eric

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