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Re: [TCML] finishing a secondary - would insulating foam be a goodidea?
In the early years, we had internal flashovers probably because we power our
coils at much higher levels than NST/MOT or small pig coils.
Now, we use three internal baffles; one for HV and the other two for
structural shaping (and a little bit of HV insulation thrown in (can't be
In so far as the foam.... Test it first to see if it carbonizes in the
presence of corona.
----- Original Message -----
From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Sent: Saturday, October 04, 2008 7:24 AM
Subject: RE: [TCML] finishing a secondary - would insulating foam be a
I've not previously heard of anyone using the expanding foam to fill a
secondary, but it seems like it would do a good job in preventing internal
arcing. I can see no down side to doing that.
However, the vast majority of secondary coils are built without any internal
baffles or other measures and problems simply don't occur, unless
construction errors like allowing the wire to enter the tubing are made, or
if the coil is absurdly over-powered.
Regards, Gary Lau
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of Thomas Ryckmans
Sent: Saturday, October 04, 2008 8:40 AM
To: tcbouklist@xxxxxxxxxxxxxxx; tesla@xxxxxxxxxx
Subject: [TCML] finishing a secondary - would insulating foam be a good
I am finishing my 4 inches/10 cm diameter secondary, fitting a few PPE
inside to prevent arcing and a couple at the ends to help fitting with
primary base and the topload respectively
Would it be a good idea to fill the secondary tube with insulating foam to
further prevent internal arcing? The foam is the one that come in
and expands and harden once sprayed. Polymer is either polyurethane or
Many thanks for your comments,
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