RE: Re[2]: SAFETY GAP CONNECTIONS

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Qndre Qndre" <qndre_encrypt@xxxxxxxxxxx>

Hey Ed,

I've got a general question to RF ground: Why is stuff grounded to RF 
ground that unsafe? As far as I see any low-frequency or direct 
current will flow directly into the ground. The remaining voltage 
will be of the very high frequent kind for which the ground line will 
act like an inductor. This voltage is (in my opinion) too high 
frequent to cause any damage to personnel (high frequencies above 100 
khz and even more above 200 khz do not cause muscle contractions or 
ions passing through membranes and tend to flow in the outer regions 
of a conductor - furthermore the nerves will not respond to high 
frequent current so it won't be painful (this is why a Tesla coil 
won't shock if the resonant frequency is high enough) - the worst it 
will do is that it may cause some heat to be generated in the tissue 
which is generally not too critical if the output current is not too high).

Using the mains greenwire-ground as a ground for RF stuff is not a 
good idea since the high frequency currents may cause severe damage 
to sensitive equipent on the mains. I couldn't think of a worse RF 
ground than mains-ground. But water pipes, as you mentioned them, are 
generally good RF grounds. Usually you just don't have a better one. 
I agree that it's better to have an RF ground seperated from just 
about everything but I would talk of water pipes being a "good 
enough" RF ground.

Maybe you can go and explain this a bit further.

Regards, Q.

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From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re[2]: SAFETY GAP CONNECTIONS
Date: Mon, 19 Dec 2005 01:03:05 -0700
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Original poster: Illicium Verum <sebas@xxxxxxxxxxxxxxxx>


Hello Ed,

I too think that touching the RF ground during operation isn't save.

I was therefore surprised that a list member used the radiator pipes 
as an rf grounding during a show in a school, the radiator system in 
the whole school building would therefore be unsafe to touch. I can 
think that even washing your hands can be dangerous, especially for 
young children.


I would perform these kind of shows outside.