Re: Series Variacs

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

Original poster: "Jeffrey Wiggins by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jeffrey.wiggins-at-sympatico.ca>

Yikes!

I see many problems with your proposed arrangement.

Keeping in mind that I have only a limited understanding of this
stuff...here's how I would do it:

Assuming your 240V is single phase, I would use the neutral anyway - the
"bottom" of each variac
would be connected here - and, depending on local electrical codes, would
be tied to ground. The
"top" of each would be connected to each leg of the 240V supply. You would
then have to gang the two
such that the wipers each arrived at the "0V" and "120V" positions at the
same time. This way, the
output between the wipers would vary from 0V to 240V as you require.

Does this make sense, or am I completely "out of it"?

My C$0.02 worth (about US$0.013).



Tesla list wrote:

> Original poster: "Yurtle Turtle by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <yurtle_t-at-yahoo-dot-com>
>
> I have two 120 volt variacs. One is 5,000 watts and
> the other 5,500 watts (for incandescant loads). Can I
> simply series them and run at 240 volts, using the two
> wipers as the outputs? I don't currently use a
> neutral, so I don't invision connecting anything to
> the "center tap". I don't see how this arrangement
> would need chokes. The variacs can be more or less
> ganged, so I should be able to keep them fairly equal.
>
> thanks
> Adam
>
> --------------
>  ^            )
>  |            )
>  |            )
>  |            )<-------
>  |            )        ^
>  |            )        |
>  |            )        |
> 240 v.     ---      0-240 v.
>  |            )        |
>  |            )        |
>  |            )        v
>  |            )<-------
>  |            )
>  |            )
>  v            )
> --------------
>
> =====
> Adam Minchey
> yurtle_t-at-yahoo-dot-com
> www.geocities-dot-com/yurtle_t/index.htm
>
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