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Re: 1256D Paralleling Choke

Original poster: BunnyKiller <bunnikillr@xxxxxxx>
hmmm you are right ( not a stickler for details) but here it goes... my system uses 2 @ 7.5 A variac cores stripped of the original wire... core size is 4" od with a 1.5" id and 4" tall wound with # 8 THHN solid copper 10 turns each side
but in my setup I am paralelling 2 variacs per leg of the 240VAC ( 4 variacs stacked 2 per leg therefore 2 chokes)
for a total of 280VAC at 56 or so amps ( I have pushed it to 60 amps for several minutes with minimal warming)
in the "laser mode setup" it has run for 45 minutes pulling near 60A at full voltage output ( usually blow the fuse on the variac after 45 minutes or things get rather toasty) and BTW NEVER replace a fuse with a 3/8 bolt it leads to a blown fuse and the other variac taking the full 60A load along with toasted brushes....
voltage differences between variacs run approimately 2% (about 3-4 volts tween legs) 

hope this cleared things up...

Scot D





Tesla list wrote:


Original poster: "Cameron B. Prince" <cplists@xxxxxxxxxx>

Hi Scot,

One of the websites I originally read about this subject was yours. You
don't give much information on the core size though.

Thanks,
Cameron

> Original poster: BunnyKiller <bunnikillr@xxxxxxx>
>
> Hey Cameron...
>
> Back again     had to update my website...
>
> see this page for wiring and info
>
>
> http://members.cox.net/bunnikillr/parallel.html
>
>
> Scot D
>
>
>
> Tesla list wrote:
>
> >Original poster: "Cameron B. Prince" <cplists@xxxxxxxxxx>
> >
> >Hey guys,
> >
> >I've got 2 1256's I've mechanically ganged together. I now need to build
> a
> >paralleling choke for them. I've read some posts and websites on how this
> is
> >done, but they talk about using an old variac as the core. I have a
> ferrite
> >torroid that measures 2.25 inches O.D. 1.50 inches I.D. and is .75 inches
> >wide. I believe the core is physically large enough to get 16 turns of
> 8AWG
> >around it, but I'm concerned if the core is magnetically large enough or
> >not. Any thoughts about this would be appreciated. I do have two of these
> >cores, so I could stack them and wind through both at once if need be.
> >
> >Thanks,
> >Cameron
> >
> >
>