Re: Grounding pigs

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Dave -

Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Tesla729-at-cs-dot-com>
>
> Hi Bart,
>
> True, if the strap is left connected you will have +120 volts to one outer
> LV bushing and -120 volts to the other, relative to the grounded "strap"
> on the center terminal. It will effectively be two 120 volt sources, out of
> phase (or is that in phase).

Out of phase.

> But most pig coilers are going to opt to power their pig trannies
> through a 0 - 240/280 volt variac and here is where the problem would ex-
> ist by leaving the strap connected. A 240 volt variac basically has infinite
> range of output voltage between 0- and 240 or 280 volts. So that is what
> you want to feed into your pig. If the center strap is grounded, that will
> shunt the inputs from each leg of the variac to ground. "I" personally see
> that as a problem.

Ahh, yes, of course.Very good! I didn't consider the variable reactors
prior to the
pigs. In the typical methods of connection we use at the variac, this could
present
a problem. So Chris if your reading, the variac is why it's a good idea to
remove
the strap.

Thank you David,
Bart