Re: [TCML] RF GROUND EXPERIMENTS

[jimlux <jimlux@xxxxxxxxxxxxx>]

bartb wrote:
> jimlux wrote:
> > Yes.. Definitely to secondary bottom (with short direct wire).. also 
> > should be connected to electrical safety ground (so that if something 
> > shorts to the ground screen, like a HV wire, you don't have a safety 
> > hazard).
> Hi Jim,
>
> I would argue the mains ground connection. By connecting the 
> counterpoise to the safety ground, your going to be throwing all the 
> garbage from the coil back to the house (attempt at filtering or not). I 
> understand the safety concern, but considering the application at hand, 
> there are a lot of safety concerns beyond this one. I would consider 
> this concern no different than the others. I see no reason to bring in 
> all that garbage back to mains ground in a Tesla Coil application. I 
> think a coiler is better off being aware of the HV hazard and dealing 
> with it as he/she would with all other HV hazards.


You have a very valid point here..

If you were to use, say, one of those standard EMI line input filters, 
though, you could suppress out at least the fast transients, while still 
passing sufficient DC/line frequency current to trip a breaker, or hold 
the "touch potential" of the counterpoise at safe levels.


> Hot primary possibility = don't touch until cap is discharged. Charged 
> cap possibility = discharge before touch. Counterpoise goes hot with HV 
> wire = disconnect everything before going near the coil and discharge 
> the screen before touching. I realize we all have our opinions, but I 
> know that I won't be connecting a counterpoise to mains ground and I 
> won't recommend to others to do this. The main reason is that "most" 
> counterpoise uses are forced (going on the road or stuck in an 
> apartment). In either case, the last thing you want to do is kill other 
> peoples appliances. It's one thing to kill your own pc, Xbox, or 
> whatever, but far worse to kill someone else's. Just my opinion on this 
> matter.

Let's see.. what sort of measurements could we do to answer it empirically.

I've got a standard FCC testing style Line Impedance Stabilization 
Network (LISN)...

And, I've got a small NST coil that would be a good candidate.. a wood 
table to set it on, etc.


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