Re: Power Load Balance Concern

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

This won't work very well...  One set of NSTs will be running at a different
voltage than the other, and since all the outputs are in parallel, this is
sort of bad news.
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, September 23, 2001 2:15 PM
Subject: Re: Power Load Balance Concern


> Original poster: "S & J Young by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<youngs-at-konnections-dot-net>
>
> Matt,
> Consider using your 4 NSTs with the primaries wired in series-parallel (2
> sets of 2 in series, parallel the series sets) and run from 240 V.  You
can
> run one leg of the 240 directly to your NSTs and run the other leg through
> your variac, using the neutral as the common connection for the NSTs and
the
> variac.  Thus your control range will be 120 - 240 volts which ought to be
> OK.  This keeps the current below 20 amps.
>
> --Steve
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Sunday, September 23, 2001 12:52 PM
> Subject: Power Load Balance Concern
>
>
> > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <Mddeming-at-aol-dot-com>
> >
> > Hi All!
> >         I am in the process of upgrading my power supply to 4 15/60 NSTs
> and
> > already have a 120v input -at-30Amp,  model W30M Variac. Based on nameplate
> > ratings, the NST bank  should draw about 33 Amps total (4X8.25). The
> problem:
> > since there is only one open slot left in my breaker box, I would like
to
> use a
> > 40Amp breaker, but I have not seen single breakers for this kind of
> current.
> > Most are dual breakers -at- 240 V using both sides of the line to keep the
> load
> > balanced and prevent in-house brown-outs.  If I try to get a 4KVA
> > step-down/isolation transformer so as to utilize both sides of the line,
I
> am
> > looking at ~$350 plus S&H on 120 lbs.
> > Questions:
> > 1. Is running the Variac at +10% a real concern?
> > 2. Is placing this size load on one side of the panel going to create
> in-house
> > imbalance problems?
> > 3. Anyone got a cheap step-down 4KVA transformer?
> >
> > Would appreciate response from any/all with experience in this area.
> >
> > Matt D.
> > G3-1185
> >
> >
> >
> >
>
>
>
>