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Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
So in a sstc you see large thick white arcs. Some high freq coils give a red thick arc to air. They are vttcs. Like the hellfire tc.
So are those thick white arcs a product of the frequency or the coil carrys actual. current? Like a sgtc can contain a micro amp or something. What does a cw sstc measure in current ? :P SO touching its sparks can be lethal?
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The thick white arcs are probably about 100mA RMS of RF current. It's not lethal, or at least it didn't kill me the last time I passed it through my body. But it can cause nasty RF burns.
They don't kill on contact because the frequency is higher than our nervous system can interact with so all you get is rf heating instead of neuromuscular disruption. This is true of CW only, interruptor pulsing is able to interact with the nerves so isstc or drsstc don't apply.
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
So if you increase the frequency of a billion volts at a sixtillion amps at 1 mhz and touch booth contacts wont i die. High frequency means you dont feel it only:/ Am talking about the heart stopping :/
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Arcingnoob wrote ...
So if you increase the frequency of a billion volts at a sixtillion amps at 1 mhz and touch booth contacts wont i die. High frequency means you dont feel it only:/ Am talking about the heart stopping :/
Your example is not serious and that kind of current would of course vaporize you instantly from internal heating.
Our nerves are not able to register currents when we get some amount over 20kHz, give and take. The heart is after all just a muscle controlled by electric impulses and therefore the same applies for the heart as for the nerves.
But keep in mind that conducting 100mA through your body is properly not a good idea even though you wont die from it.
Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
Sigurthr wrote ...
They don't kill on contact because the frequency is higher than our nervous system can interact with so all you get is rf heating instead of neuromuscular disruption.
True, but I also thought that just because its such a high frequency that our nerves don't respond doesn't necessarily mean that you wont suffer nerve damage and experience side effects later on in life (but only from a lot of contact) side effects like shaky hands from letting the sparks hit your hand or maybe you lose some feeling. Anyone confirm this? I may be wrong but that's the way I understood it.
I think that is very possible, at least I've heard of it from old coilers. I would bet it is gradual demyelination from the nerves conducting far more current than normal.
As for skin effect; the penetration depth of rf for most TC frequencies is several centimeters. I suppose a HFSSTC might benefit from it more though.
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Current measurments in cw sstcs
But it can cause nasty RF burns.
