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 Ed,

Yes, I agree. As I mentioned to David, I did not account for the variac. I
personally don't ground L1 to the case (I run my pig like you, David, and most
others). But when Chris asked the question, I had to wonder what would
happen. I
even went as far as modeling the configuration in Microsim and it showed me
exactly
what I thought would happen (it worked normally). But like I said, in all
of this, I
didn't even think about the variac ballasting or anything previous to the
transformer. But, now we know. It was a good question and for me it was another
little piece added to the knowledge base.

Take care,
Bart

Tesla list wrote:

> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Esondrmn-at-aol-dot-com>
>
> In a message dated 2/16/02 9:53:14 AM Pacific Standard Time, tesla-at-pupman-dot-com
> writes:
>
> Bart,
>
> My thoughts on this is to disconnect the neutral lug from the case, then
earth
> ground the case.  My reasoning is that a single variac acts like an
> autotransformer, not an isolation transformer.  Even in the off position, the
> brush is connected to one side of the 240 volt AC line.  If the pig
center lug
> was grounded to the same ground as the electrical service, you would have 120
> volts across one primary of the pig with the variac set to zero, but with
power
> applied to it.
>
> Ed Sonderman