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Re: question on safety



Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi,

As the heart runs, there is a "bad time" in the heart beat cycle that is especially vulnerable to electric shock.

"" A frequent question that arises is why some people are relatively unaffected by currents between 100 mA and 1 A. Research on the heart has shown that ventricular fibrillation as a result of electric shock is also a matter of timing (9). The contraction cycle of the heart proceeds through various phases, each of which occupy a different amount of time. Although it is possible to induce fibrillation during each phase, the difficulty of doing so is dramatically lower during the reset portion of the systole phase. If a lethal amount of current enters the heart during this phase, there is a very high likelihood that the heart will go into fibrillation. The odds of being shocked during this phase of the heart cycle are approximately 20%. Thus, the majority of people shocked by a lethal amount of current will live through it, but it is truly a game of Russian roulette. ""

http://web.bsu.edu/tti/3_3/3_3h.htm

I have "heard", but do not know for sure, that the doctor that found this out got killed experimenting on himself ;-((

Cheers,

        Terry





At 08:11 PM 4/14/2006, you wrote:
thanks a bunch for all the information from the responses. the Instantaneous amps explanation from the capacitor helped a lot. also, it seems like a lot of times its just a roll of the dice, but no matter the outcome its going to hurt. In any case ill tell people that its possilibly fatal and never too touch it, i know i plan on not getting shocked anytime soon. thanks again for the information and explanations.


From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: question on safety
Date: Fri, 14 Apr 2006 17:13:40 -0600

Original poster: BunnyKiller <bunikllr@xxxxxxx>

Hey Michael...

personally I wouldnt touch any part of any coil when it is energized...
as far as volts amps etc its more of a power thing
basically volts times amps in a crude relation...

I have been shocked by 40 volts from a welding machine and it hurt I have also been semi-directly hit by lightning ( that REALLY hurt) and I have seen 1" static electricity sparks jump from my finger ( fairly high voltage) I have also experienced a shock from a HID spark system from a car ( 30KV) with some discomfort. But there are "records" from list members being hit by 15KV 120ma NST's and being knocked to the floor and having some great difficulty regaining thier composure for several hours.

A defibulator can stop a heart and that is no where near the voltages we use for coiling but considering that the voltage and amperage in combination is what will do you in... for example, the 1" static spark jump from the finger was a mild snap with no after effects, the 40 volt shock from the welding machine was noticeable only during contact, the lightning strike was serious... couldnt move for 45 minutes and left "fractal" looking bruises on my arm chest and leg. The car spark system did more damage to my elbow when i pulled back and hit the fender...the fingers had no damage... its a combination of voltage present amps available and the resistance of the "material" it has to travel thru....

capacitors when charged can do some very serious damage due to the extreme current available at the time of contact... even small ( low voltage hi mF) caps can blow apart a screwdriver tip when it contacts both connections... and in reverse, a hi voltage low mF cap can do the same thing but with more "punch" ( due to the higher voltage Ohms Law) do some reading on coin shrinking... the wire or should i say cable ( like in welding cable as thick as your little finger) will basically vaporize when the cap is discharged thru it... ehhhh plus the EMF involved does help in blowing it apart too ;)

best bet... dont touch... Coiling is a spectator sport look but dont touch.... and by the way... if you are running a coil and have an extra secondary sitting around in the near vacinity be careful of that one too... but thats a whole new thread electropherisis etc :)

Scot D



Tesla list wrote:

Original poster: "Michael Ong" <omenowner725@xxxxxxxxxxx>

hello, today i was presenting my tesla coil for my school project, and i got asked if it was fatal to touch the spark gap or charged caps. I honestly didn't know the answer to this question and was wondering if anyone could answer it for me. my coil runs at 8kv 30ma with a cap size of .01uf and i have always just assumed it was unsafe to touch and in any case will give you a burn, who cares if it will kill you. the chart on my class room says that 30ma is close to "possibly" fatal, but it seems like there are a lot of factors like the voltage, the path it takes through your body, your body resistance at the time, and the climate conditions that plan key roles. anyways i was wondering if there was an easy answer to this question of how many amps/volts will kill you or if there are just too many factors that are undetermined to correctly give an answer. thanks again for the help
-Michael





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