Re: I Need Electrical Help!(author's response)

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

Original poster: "David Trimmell by way of Terry Fritz <twftesla-at-uswest-dot-net>" <davidt-at-pond-dot-net>

Drew, Please use caution. This PT is not ment to have the primary
(secondary, actually) over-volted, if rated for 120V then you are probibly
safe up to 140-150 Volts max, before you saturate the core. If you apply
300V to the 120V side you WILL see the magic smoke (or worse). Before you
do anymore testing I STRONGLY urge you to install a 20 amp quick blow
fuse on the house side of your variac, this may save your variac (from
further damage) and help prevent you from melting your house wiring, a 15
amp thermal fuse might not be a bad idea either (with the quick
blow). This PT is a bit low voltage for a standard Tesla coil, but would
be great for a Vacuum tube coil.

Regards,

David Trimmell

On Mon, 12 Feb 2001, Tesla list wrote:

> Original poster: "Drew Murray by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <drewallmighty-at-hotmail-dot-com>
> 
> Ok,
> I got my PT today. Its a beauty. 4200v : 120v  A little less than i wanted 
> but it will do. NOW I SEE WHY CURRENT LIMITORS ARE NEEDED!!!!
> I hooked up an extension cord to the PT, plugged it into my variac/ amp 
> meter, unit, bent two wires so that they were about an inch apart, stood 
> back, flicked the switch and slowly turned the variac. As soon as an arc 
> formed,,,,,,,BANG POP BZZZZZZZZ *Flick* ,,,,,,,,,I'm in the dark. DArN! It 
> dimmed the lights in that wing of the school, and temporarily welded the 
> slider thingy on my variac to the windings. Now i have it limited with one 
> of my burned out OBITs. I managed to tweak my 35 lbs 120:240v transformer so 
> that it put out 300v. Lotsa amps on the 300v side too(big core i think). I 
> have my obit in a series with my PT, and hooked up to the 300v xfmr, all of 
> which is enclosed in metal casing, (Very professionally built). when i run 
> the pt on 300v i will be getting...................300x35=10500.....10500v. 
> the pt is rated for 1000va and it has two huge ass fuses on the top. I got 
> it for $5 from the surpluss dude at N.B Power. Its brand new. ABB Power T & 
> D Company Inc.
> Thanx for your help and more comments would be appriciated.
>                                                        Prof, Drew
> 
> 
> 
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