RE: proximity of ballast to variacs

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

Original poster: "Lau, Gary by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Gary.Lau-at-hp-dot-com>

If your concern is that the field generated by your ballast may interfere 
with the variac operation, I don't think this is likely.  The magnetic 
field in the toroidal variac core is inherently very tightly contained - 
not much gets out, and not much gets in.

A greater concern is how well the ballast is ventilated if it's behind a 
control panel.

Regards, Gary Lau
MA, USA

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Saturday, May 03, 2003 10:23 PM
To: tesla-at-pupman-dot-com
Subject: proximity of ballast to variacs


Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <CTCDW-at-aol-dot-com>

Hello all....

I'm working on my control panel for the pole transformer and I would LOVE
to enclose the ballast with the whole works.. I'd rather have one heavy
unit than several heavy parts I have to hook up. Anyway, the ballast would
be rather close (like 6 or so inches) from the variac. Here's the layout
though....the variac is mounted to the bottom of a steel X-ray Transformer
tank and the ballast (which consists of a straight set of transformer
laminations open ended) would be mounted above it and to the side. I tested
the ballast out today on 120V and there is a definite e-field around it,
since it started pulling screws and the like toward it! any thoughts on
this would be most appreciated!

Chris W