Re: Cavalier Attitude (Was Metal Rotor = Isolated Motor?)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Jason Johnson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <hvjjohnson13-at-hotmail-dot-com>


>
> Jason,
>
> I would think that you would have much more respect for electricity.
>
> Mains voltage can be lethal.  Even though YOU hardly notice it all
> anymore.
>
> There is a range of current. I believe that it is between .75 and 1.00
> milliamps which will stop the heart. ( I am sure somebody on the list
> can quote this better).  The voltage almost doesn't matter even a mere
> 12 volts will do the job and thats 1/10th standard mains voltage.

Yes this is correct. But it takes a fair amount of voltage to really do any
damage. For example, the resistance between my two hands is approximately 5
megaohms, using ohms law, in order to have a current flow of .75mA, it takes
almost 4000 volts. I had 1700 volts, and there was no path across my chest.
The resistance between my hand and the concrete floor is about 19 megaohms,
which would require 14250 volts for the same .75 mA.

>
> Along the same lines, I believe that there is a frequency that will also
> trigger fibrillation of the heart, regardless of voltage.

 snip

> I feel that this cavalier attitude will someday cause us all to mourn
> for your demise and the reputation of Tesla Coiling.

I hope not!

>
> There are a lot of youngsters on here looking for guidance.  If you want
> to take chances, go right ahead, but don't publicize that anything below
> say, 2500v is okay to be careless with.  Getting zapped in the garage
> numerous times is not something to be proud of.  It indicates a lack of
> respect with what you are dealing with.

I agree and I apologize. I'm not saying that voltages below any number are
safe to be completely careless with. The figures up top would be drastically
different had the concrete been wet, or my hands sweaty. All I'm saying is
that I know that whenever the electrodes are alignined on my rotary gap, and
there is a sprak present the MOT would be shorted and there should be no
current flow to ground from the conductor. This is essentially what saves
your DMM when you short out an NST with it to measure the current. If you
don't belive me, take an MOT, short out the secondary with a bare piece of
wire, then energize the MOT and read the voltage from the bare wire to
ground. On my rotary as soon as the rotor moves enough to take the
electrodes out of alignment, they both come out of alignment at the SAME
time, EVERY time, and the arc is extinguished on both sides at the same
time, ensuring that there is no HV present on the rotor. I trust my life to
my workmanship, and not just on rotary gaps either. I've had several years
experience with high voltage, and I know what I can safely do, and what I
cannot. I appreciate all the concern from the list, and I promise that I
won't publicize anything to the list anymore that might give someone a bad
idea.
>
>
> So, to sing along with Allanis Morisette , I'll lighten up a bit.
>
> " I got one hand in my pocket..."

I'm more of an AC/DC fan myself.

Jason Johnson

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> << Jim DeLillo >>
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