Re: Paralleling Chokes

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

Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <DR.RESONANCE-at-next-wave-dot-net>


Consider making some RF "hash chokes".  They can be constructed by winding
approx. 75 turns of #12 AWG on a 2" ID PVC tube.  Then, fill the tube with
as many 1/4 x 7 inch long bolts as you can --- after cutting the head off
the bolt to make it into an iron rod.

They clip and reduce some transients before they do any damage in the power
circuit or on the variac brushes.  It's best to have them right at the point
where the power leaves your control cabinet and then use some varisters
between each choke and ground just before the power enters the variac to
clip any remaining "nasties".

Some dual variacs have paralleling chokes to equalize current distribution
but they are not necessary if your loads are reasonably balanced.  We always
strip them off and never use them.

Best regards,

Dr. Resonance



----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, July 14, 2002 8:16 PM
Subject: Paralleling Chokes


> Original poster: "Ben McMillen by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<spoonman534-at-yahoo-dot-com>
>
> Hi all,
>   I've noticed several power cabinet schematics that
> include paralleling chokes directly after the voltage
> control variac.. What are they for and how do I construct
> them?
>
> Also.. I'm wiring my cabinet for 220V.. but I'm having
> trouble figuring out how to get a neutral to run 110V
> accessories.. I was thinking about running a neutral into
> the cabinet, but I already have a 3 wire cord with a nice
> plug.. I realize I could use the ground wire because
> they're the same, but I didn't think that was safe..
> someone had a twin variac with the center taps tied
> together for a neutral.. however, mine doesen't have this
> center tap.. but it has other taps..
>
> Thanks for any help!
>
> Coiling In Pittsburgh
> Ben McMillen
>
>
>
>