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Re: Very Confused On Grounding

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

Another thought that I had...if I use the RF ground for my NST case won't there be tons of RF on the NST and NST internals? Wouldn't doing this defete the purpose of the Terry Filter and possibly kill my NST? What if I just use the RF ground for the safety gap, filter, strike rail, and bottom of secondary? Not using mains ground at all. I just can't afford anything to get damaged. It took me nearly 6 months to get me 12/30 Franceformer NST. Everything in the house is my parents and CANNOT get damaged. Thanks

From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: Very Confused On Grounding
Date: Sun, 15 May 2005 11:19:51 -0600

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

And in general, anything that can be hit by a streamer should be grounded to the RF ground. If it is too far away to be hit, ground it to the AC ground.

Cheers,

        Terry

At 12:20 AM 5/15/2005, you wrote: 
Hi Terry,

I still think it is best to connect the NST case, your filter, safety gap, strike rail, and secondary base to RF ground. The variac case and EMI filter should be connected to mains safety ground. RF on the NST case will be common mode on the line input and the EMI filter should have a common mode choke (or two) in it. Personally, I dont want to take any chance of a discharge resulting in transient current traveling down (or up) the mains safety ground. This could be catastrophic to any electronics plugged into the mains, whether turned on or off. Grounding the coil system to mains safety ground, I believe, should only be considered when the coil is operated inside where earth ground is not easily available. For this case, the coil should be used with a counterpoise, the power kept low, and great care be taken as to what the streamers can strike.

Gerry

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

At 04:02 PM 5/13/2005, you wrote:
In the Terry Filter he shows one side be grounded to RF (spark gap side) and the other side of the filter be tied to the NST case. Wouldn't this cause major RF on the NST case and maybe inducing into house lines?

Interesting thought... I was thinking the NST case might be hit by streamers in which case it would be best to have it tied to the RF ground. "Maybe" there are situations where the case would be best tied to the AC. But I normally just use the AC ground for safety since it is terrible and conducting RF.

All my coils have MOVs and dual-stage line filters on the AC line too :-) So maybe if you are worried, you would want to do that as well. That stuff can be far back at say the AC power outlet. Mine are inside the variac controller.

Cheers,

        Terry