Re: [TCML] Re: Fried It!

[Gary Lau <glau1024@xxxxxxxxx>]

Hi Derek,

You understood correctly, I think.  The NST case must connect to RF ground,
not mains ground.  This is because the safety gaps are also connected to the
NST case (connected to the NST center tap).  If the NST case were connected
to the mains ground, if and when a streamer hits the primary,  the current
in the safety gap would be flowing to the mains ground, and we don't want
that.

Yes, having the RF ground connected to the NST case will increase the amount
of common-mode noise coupled into the mains, but it's the lesser of two
evils.  Both connection schemes have their down sides.  There's no getting
around it -Tesla coils are dirty, dirty things!

Regards, Gary Lau
MA, USA



On Thu, Nov 11, 2010 at 6:24 PM, Derek Esq. <a_key_move@xxxxxxxxx> wrote:

> So with all the discussion that emi filters don't filter everything out -
> what's a reasonable or appropriate amount of filtering to use? Let's say
> for the typical 15k NST that's run outdoors at least 10 feet from any
> structure and assuming an appopriate RF ground is in place?
>
> Another comment Gary made (I think) that was interesting was that
> connecting the RF ground to the NST case essentially lets RF to pass
> directly into the NST and back into the lines. So doesn't that then go back
> to the old discussion about whether to ground the NST case to the RF ground
> or the ac ground? Or did I misunderstand your comment Gary?
>
> Thanks,
>
> Derek
>
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla