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Re: [Amps] Better electrical safety?

To: ToddRoberts2001@aol.com, amps@contesting.com
Subject: Re: [Amps] Better electrical safety?
From: Bill Turner <dezrat1242@ispwest.com>
Date: Sat, 19 Nov 2005 16:33:02 -0800
List-post: <mailto:amps@contesting.com>
At 08:23 AM 11/19/2005, ToddRoberts2001@aol.com wrote:

>Are you sure that 1KHz AC is shockproof? 1 KHz may not be as lethal as
>50-60Hz but I was under the impression that anyone could suffer a 
>very severe and
>painful shock from 1KHz AC depending on volts/amperage? I think I 
>read that even
>at 10KHz a very real shock hazard still exists. Does anyone have any tales of
>working with 115vac 400Hz systems on airplanes? 73 Todd WD4NGG
>_______________________________________________

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

400 Hz is too low to be "shockproof". I've performed the experiments 
on myself and that's how I know. For me, the threshold is about 600 
Hz. At 1 kHz I could feel nothing even at 150 volts.

At some level of current of course, one would be literally cooked, 
but the resistance of the body is pretty high in terms of enough 
current to cause serious heating. Remember, for low frequencies the 
fatal current is in the low milliamperes. At high frequencies, a few 
milliamperes even at 120 volts is only a few watts and would be 
spread over a large area of the body. One would immediately sense the 
burn and yank one's self clear. I doubt any "cooking" of any 
consequence would occur.

Again, these thoughts are only preliminary. Much research would have 
to be done.

73, Bill W6WRT

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