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Re: Very Confused On Grounding

Original poster: "Daniel Koll" <dk_spl_audio@xxxxxxxxxxx>

Thanks for the well explained reply. This is now what I am planning on doing...
RF ground will contain the following:
-Middle of Terry Filter and Safety Gap
-Strike Rail
-End of secondary

The following will be connected to mains ground:
-Metal Enclosed 25A EMI Filter

I still not sure about the NST case and Terry Filter configuration though...I have written the following options and would like to know which one I should use. I am still quite confused seeing as how many different answers I have received.

-Connect the NST case to RF ground with Terry Filter connected to NST case (can't RF get into the mains via the NST's primary connections then?)
-Use mains ground for NST case (the problem with this option is the RF ground and mains ground would be connected together via the Terry Filter.
If I use mains ground then I would think that the Terry Filter should not be connected to the NST case (is this even an option) to avoid coupling the grounds.
Which of these options should I do? Thanks for all the help guys, I really appretiate it!

From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Very Confused On Grounding
Date: Mon, 16 May 2005 10:47:53 -0600

Original poster: "Bob (R.A.) Jones" <a1accounting@xxxxxxxxxxxxx>




Original poster: "Daniel Koll" <dk_spl_audio@xxxxxxxxxxx>

It's a modified sine wave, oh well. I will just do what I said and not use mains ground at all and have the NST case floating. I think that will be the safest way for my houses equipment. Thanks

Probably a bad idea to have the case floating or anything else for that matter.

1. Floating items have tendency to build up a charge via leakage paths and corona pickup.
If the voltage builds too high it can break down the insulations permanently.

2. If for some reason high voltage does get to the case it may jump to the mains input and permanently damage the insulation as in 1.

3. RF coupled from the secondary will probably produce a much higher voltage on the case than if the case is grounded.
The higher case RF voltage will couple more voltage to the mains input.

I agree with others that have stated "connect it to RF ground" for minimum RF back to the mains.


Robert (R. A.) Jones