Re: [TCML] Newbie Grounding Question

["Tim Meehan" <btmeehan@xxxxxxxxx>]

What about the ground ring?  I am guessing that it is RF ground only.

Do all coils need the ground ring - or only high power ones?

On Dec 27, 2007 8:06 PM, bartb <bartb@xxxxxxxxxxxxxxxx> wrote:

> Hi Ken,
>
> Your right, this area of connection varies with the builders and their
> reasons. You'll no doubt get both connection concepts listed. There are
> two main reasons for the division in agreement. One is safety. The other
> is preventing common transients on mains ground. You'll have to choose
> as it's an endless debate. Either will work of course.
>
> I connect RF ground to the NST, NST filter, secondary. My NST is placed
> under the coil. I don't even run a mains ground out to the coil. I keep
> mains ground at the control panel only (anything I am in contact with).
> This method helps prevent transients on main ground (which I am more
> concerned with). However, I also use a braided line which powers the
> NST. The braid itself connects to RF ground. I run quite a bit of power
> and can get strikes down to the floor quite often, so to prevent the AC
> input from being hit, this braided shield helps to keep the strike from
> heading back to the house.
>
> One thing important is to be sure RF ground is "always" connected. If
> not, those transients "will" find a way back to the house. But if you
> give them a nice low impedance path somewhere else, they'll take that
> path instead. And that is the whole point of an RF ground connection to
> the NST. I do the same with all my transformers and for the same reason.
>
> No one can guarantee that devices in the house will always stay in good
> working order, but we can surely do our best to try to prevent known
> issues.
>
> Take care,
> Bart
>
>
> kkociolek8577@xxxxxxxxxxxxxxxx wrote:
> > Hi Everyone,
> >
> > I've been an EE for 25 years and always wanted to build a TC. I made a
> half-
> > arsed attempt in my younger days but it never got off the ground. I've
> been
> > digging through the archives and am a little bit confused about what
> > connects and what does not connect to an RF ground. Some say that the
> only
> > connection to an RF ground is the bottom of the secondary. Others state
> that
> > the center tap and core of the nst, the spark gap housing, mid point of
> > filters, all on the high side of the nst should connect to RF ground.
> Others
> > say this is lethal. Maybe I'm misunderstanding all this info. Can
> someone
> > set me straight? Thanks.
> >
> > Ken
> >
> > --
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