RE: [TCML] finishing a secondary - would insulating foam be a good idea?

["Lau, Gary" <Gary.Lau@xxxxxx>]

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
MA, USA

> -----Original Message-----
> 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 idea?
>
> Hello,
>
> I am finishing my 4 inches/10 cm diameter secondary, fitting a few PPE disks
> 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 canisters
> and expands and harden once sprayed. Polymer is either polyurethane or
> polystyrene.
>
> Many thanks for your comments,
>
> Thomas

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