Re: Safety FAQ is here -- draft, asking for comments.

To: tesla-at-pupman-dot-com
Subject: Re: Safety FAQ is here -- draft, asking for comments.
From: Dave Huffman <huffman-at-d0tokensun.fnal.gov>
Date: Fri, 2 Aug 96 08:36:00 CDT

> From tesla-at-poodle.pupman-dot-com Fri Aug  2 00:12:44 1996
> Date: Thu, 01 Aug 1996 23:00:22 -0600
> From: Tesla List <tesla-at-poodle.pupman-dot-com>
> Subject: Re: Safety FAQ is here -- draft, asking for comments.
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> >From MALCOLM-at-directorate.wnp.ac.nzThu Aug  1 23:00:11 1996
> Date: Fri, 2 Aug 1996 16:55:12 +1200
> From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
> To: tesla-at-pupman-dot-com
> Subject: Re: Safety FAQ is here -- draft, asking for comments.
> 
> Regarding this post...
> 
> > Was the oddest thing. As I was reading the note- TV Olympics anouncer 
> > started talking about guy on crew team almost electrocuted with 30kV.
> > 
> > Anyway, my understanding about electrocution potential of AC vs. 
> > frequency is that just as the human ear cannot hear much beyond 18khz, 
> > neither can the body respond in much of any other way than sensing 
> > heat dissipated at those frequencies.  Reason for both insensitivities 
> > is supposed to be inherent slowness of nerves beyond these freqencies.
> > 
> > I've demonstrated this pretty well with flyback transformer and short 
> > pulse at a variable rep rate.  When I've adjusted pot beyond where my 
> > ear could hear mechanical vibration frequency, have only gotten skin 
> > burns.  Below that shock seems to get worse, although I'm not sure if 
> > its inversely linear with frequency.  
> 
> What you are describing is a classic example of the SKIN effect at 
> work :)  NOT to be confused with voltage. 10:1 the 30kV was at 60Hz.
> As frequency rises, current penetration becomes less (inversely 
> proportional to square root of the frequency). I don't think nervous 
> responses play any part in this.
> 
> Malcolm
> 
I'll bet you can 'feel' RF if it comes in 60Hz busts.
dave