Re: Power Load Balance Concern

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

Original poster: "Nick Andrews by way of Terry Fritz <twftesla-at-qwest-dot-net>" <nicothefabulous-at-hotmail-dot-com>

Also remember that if it's a single 1" module with two breakers they are 
both fed off the same bus and are both at the same potential.  They are used 
to cheat and get more circuits out of a load center.  You can usually find 
them with differing ratings, such as a 15A-20A I have in mine.  I've seen 
them in 40A-40A as well.  The dual pole breakers are normally ~2" wide (2-1" 
modules riveted together) and are fed from separate busses to get the 240V.  
If you want a single 120V-at-40A, just pop in a dual single-pole spacesaver 
unit, and leave one unused for now...

Nick Andrews, Denver


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: Power Load Balance Concern
>Date: Sun, 23 Sep 2001 15:15:40 -0600
>
>Original poster: "Crow Leader by way of Terry Fritz <twftesla-at-qwest-dot-net>" 
><presence-at-churchofinformationwarfare-dot-org>
>
>Use just one half of the dual breaker. It is just two breakers bonded
>together. One side connects to one 120 volt hot and the other to the other.
>Across both you get 240 volts. They share the same neutral. Normal 120 volt
>circuits are divided up across both busses.
>
>KEN
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Sunday, September 23, 2001 1:52 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
> >
> >
> >
> >
> >
>
>
>


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