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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: OT (sort of) help for a total newbie
References: <email@example.com> <3DB1721B.C79A99F3@webaccess.net> <3DB18860.firstname.lastname@example.org> <3DB1F2C5.75C210AB@mfi.net> <3DB20517.84C3DA7B@mfi.net> <3DB20D3A.email@example.com>
Date: Sun, 20 Oct 2002 04:49:20 GMT
NNTP-Posting-Date: Sat, 19 Oct 2002 21:49:20 PDT
Fred Bloggs wrote:
> Michael A. Terrell wrote:
> > "Sir Charles W. Shults III" wrote:
> >>"Michael A. Terrell" wrote in message
> >>>Fred Bloggs wrote:
> >>>>Speaking as someone who has been electrocuted on and off since the age
> >>>>of four,
> >>> Fred, you sure do post a lot of messages for a dead guy.
> >>>Michael A. Terrell
> >> He's probably having a forty year near death experience.
> >>Chip Shults
> >>My robotics, space and CGI web page - http://home.cfl.rr.com/aichip
> > Don't you love it when someone looks you in the eye and tells you
> > they have been electrocuted, and they believe it? You can't convince
> > them that they would be dead because THEY were the ones electrocuted,
> > not you!
> LOL- people can sustain shocks at lethal levels but survive because the
> current path was not. I have seen people get knocked on their butt
> because of arcing that jumped three feet out of a high voltage power
> supply and hit them in the chest. I also know of another who was blasted
> by a 20,000 Volt supply and propelled like a projectile against a steel
> bulkhead ten feet away, he hit the bulkhead on the fly- sustaining a
> skull fracture and broken forearm. I am sure that the energy level was
> high enough to kill in each case, and these people lucked out. I will
> call these near-electrocution experiences-)
Sometime, probably between 1960 and 1965, Tektronics published a safety
bulletin that explained why such powerful shocks as you mention are
often not fatal while much lesser shocks are almost sure death. It is
not just the current path through the body that is important but also
the current. For medical reasons having to do with the heart, high
currents, even across the trunk, may likely not be fatal while a smaller
current may cause fibrillation and shortly death.
I don't know if this safety bulletin is still available but if you work
with high voltage, it is worth a read. I read it in 1966 when I was
working for the University of California and occasionally worked around
voltages up to 600,000 volts. That sounds very dangerous but it was not.
The only fatality I heard of there from the 600,000 volt power supplies
was that a worker went inside an open power supply before it had been
thoroughly flushed and died from breathing sulfer hexafluoride. I myself
more commonly worked inside a 450,000 volt power supply which had air
inside. Full safety precautions meant I had a pocket full of keys. The
keys were for key switch interlocks. Removing a key disabled a system
from operation. The idea was to remove a key from each system involved
in the work so when I opened the door into the power supply, I had quite
a few keys.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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