RE: ballast are bogus!!! (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Sat, 08 Sep 2007 12:29:18 +1000
From: T476202 A. Wang 2007 <tangara_02@xxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: RE: ballast are bogus!!! (fwd)

Everyone's got a point. The long wires are probaly forming an unintended 
ballast. For safety's sake, you should get a ballast.

I use a MOT for my power supply(with a 4-stage multiplier). I can pull 
nothing short of a full 20A out of the primary circuit when the secondary is 
shorted. This only stops either when A. The wiring melts, B. the breaker 
pops, or C. the secondary windings explode.

I've welded shut about 5 10A breakers through accidents with the safety gap. 
When the secondary is shorted, the doubler wont do much to stop a short 
circuit current. My safety gap is on the 2KV side of the MOT, and when that 
fires, the arc won't extinguish, and you will have nothing short of about 
18-20A pulled across the primary windings.

I really want to try shorting a MOT under oil, with 30A wires. See what 
happens.

If you're using a pole pig, then if there is a short, you will have AT LEAST 
a short circuit current of roughly 225A. You'll have a lot of melting wires.




>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: RE: ballast are bogus!!! (fwd)
>Date: Fri, 7 Sep 2007 15:59:26 -0600 (MDT)
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>---------- Forwarded message ----------
>Date: Fri, 7 Sep 2007 09:11:27 -0400
>From: "Lau, Gary" <Gary.Lau@xxxxxx>
>To: Tesla list <tesla@xxxxxxxxxx>
>Subject: RE: ballast are bogus!!! (fwd)
>
>I'm having a hard time envisioning some way to use a SKIL saw for an RSG
>that wouldn't smoke it in short order.  That the saw was in fact
>grounded would only make its destruction more likely.
>
>At least one, possibly both of the stationary electrodes are at
>pig-potential.  If the saw case is at ground potential, how could the
>saw possibly insulate against an arcover between the blade and
>case/motor?  The only scenario I could see working would be if the saw
>was battery-powered and completely insulated from everything.
>
>Or, is the entire primary circuit, including both pig HV terminals, not
>connected or otherwise referenced to mains or RF ground?  Any arcs to
>the primary would be a problem there!  Is it possible to describe the
>primary circuit wiring?
>
>If you're running long wires from the house to the garage, they are
>probably what's saving your bacon, acting as an unintended resistive
>ballast.  Attempting to "improve" them with fatter wires would surely
>pop your breakers if they're not already welded shut.
>
>If it's not abundantly clear, the consensus is that this is a very
>unsafe configuration.  I strongly urge you to understand and believe
>that there are well-founded reasons for using ballasts and proper,
>insulated spark gaps.  A pole pig is not suitable for learning by one's
>mistakes, except by enforcing natural selection.
>
>Regards, Gary Lau
>
>
>
> > From: daryl barsoom <rockincoiler@xxxxxxxxx>
> > To: tesla@xxxxxxxxxx
> > Subject: Re: ballast are bogus!!!
> >
> > hi BunnyKiller,
> >
> >   wow, lots of responses, thanks everyone!!!
> >
> >     my coil has 950 turns of green ground wire that is kind of stiff.
>the
> > tube is a carboard tube for cement, its about 6" inside. the tube is
>6'
> > long. then i found a plastic spool for the primary and wrapped 10
>turns of
> > welding cable on it. i dont know about the 'piggie' how can i measure
>it?
> > there is a 25 painted on one side. its kind of rusty. the output will
>arc
> > about 1" with thes crewdriver. the capacator glass plates are 1/4"
>thick
> > and are about 2' wide and 3' long. they work great with the 18"
>aluninum
> > foil. i have to go count how many plates, i stacked them up until the
>arc
> > stopped getting bigger. think there's about 8? someone here was
>worried
> > about the SKIL saw, but its well grounded. its the only thing that
>hasnt
> > broke yet!
> >
> >    i think the wires from the house to the garage are way too long,
>mabye
> > fatter wires would help the arc length. i could get some of that
>monster
> > cable. the wires in the wall sometimes they knock around in there when
>i
> > turn on the switch. the dog thinks its a rat or something, haha!  :)
> >
> >   mabye a bigger electorde on top would be good. im using a aluninum
> > propane tank (dont worry its empty!) :)  the arcs usually come off the
> > feet. i will try to find a bigger electrode.
>
>
>

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