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Re: [TCML] DANGER Ground wire question



Indeed.
Output currents of SGTCs are not so small as
many think they are.
When "stremer" hits something of big capacitance
or grounded it turns into arc.
Tesla himself was almost electrocuted once in
this way.
And bigger,more powerful coils get- more dangerous
they are.They can kill.
This coil :

http://www.youtube.com/watch?v=Yo05kqGC2P8

almost made it 30 years ago when it hit careless
operator in the top of his head.
He had to be reanimated.
Therefore...

Dex     


> ----- Original Message ----- From: "Bert Hickman" <bert.hickman@xxxxxxxxxx>


the problem is the RF fields.  Even if the ground wire were at the same 
potential as "earth", you probably aren't, because you're going to be at 
some RF potential. When you touch the wire, RF current flows, and ouch.


It's also very difficult to have a truly zero impedance at 100kHz and 
higher. there's always some inductance which raises the impedance, and 
the voltage.  Granted, not a whole lot.  1 meter of wire has an 
inductance of about 1 microhenry, and at 100 kHz that's about 0.6 ohms 
(=2*pi*f*L)...

The actual current in the secondary is pretty small so you're not 
talking huge voltages.  But, spark currents are quite high (that is, 
when you get a spark, it's not the RF current flowing, but the 
capacitance of the top load discharging through the spark very quickly), 
and that can be fairly high.

However, the "shocks from the ground" problem are more likely due to YOU 
being at some elevated RF potential (just from the 100kV/meter fields 
around the coil).  Basically, you become part of a big capacitive 
voltage divider.





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