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RE: Re: SAFETY GAP CONNECTIONS
Original poster: "Qndre Qndre" <qndre_encrypt@xxxxxxxxxxx>
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.
----Original Message Follows----
From: "Tesla list" <tesla@xxxxxxxxxx>
Subject: Re: SAFETY GAP CONNECTIONS
Date: Mon, 19 Dec 2005 01:03:05 -0700
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Original poster: Illicium Verum <sebas@xxxxxxxxxxxxxxxx>
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
I would perform these kind of shows outside.