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
>_______________________________________________
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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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