RE: [TCML] Terry Filter Gound

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

Your mileage may vary!  A new NST will be much more tolerant than one that's been operating outside in 120 degree heat and rain for 20 years.  There's simply no way to know.  These are not MIL-spec components with a voltage rating that you can believe.  The closest thing is a pole pig, which is built to be reliable for a long time under the most adverse conditions.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of Dex Dexter
> Sent: Wednesday, March 11, 2009 2:42 PM
> To: Tesla Coil Mailing List
> Subject: RE: [TCML] Terry Filter Gound
> 
> 
> How much peak voltage a normal 15kv,60 mA NST tolerates?
> If the spark gap in parallel is set to fire at 18-20 kV the NST is safe without filter?
> 
> Dex
> 
> --- Gary.Lau@xxxxxx wrote:
> 
> From: "Lau, Gary" <Gary.Lau@xxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Cc:
> Subject: RE: [TCML] Terry Filter Gound
> Date: Wed, 11 Mar 2009 16:52:40 +0000
> 
> It probably comes down to how robust your transformer is, insulation-wise, rather
> than what power level it generates.  Could also be that a 15kV NST needs
> protection more than a 4kV NST, as there is less margin in the insulation.  But in
> more practical terms, I think folks tend to use a filter if they feel their transformer is
> not something they can afford to loose.  If you've got a shelf full of NST's waiting to
> be used, you're probably not going to bother with a Terry filter.  MOT's are both low
> on the voltage scale and relatively plentiful, so unlikely candidates for filter
> protection, despite being at least 1000W.
> 
> A more interesting question would be - at what power level should one use a
> dedicated RF ground.  But I gave no good advice for that one!  Probably depends
> on whether you have a house full of critical, expensive medical electronics.
> 
> Regards, Gary Lau
> MA, USA
> 
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> > Behalf Of Dex Dexter
> > Sent: Wednesday, March 11, 2009 7:02 AM
> > To: tesla@xxxxxxxxxx
> > Subject: Re: [TCML] Terry Filter Gound
> >
> >
> > What power levels requires filter for a spark gap tesla transformer?
> > Do all 500-1000 W powered coils require filter?
> >
> > Dex
> 
> <snip>
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