Evolution of the Quick connect [RE-wrenches]

Sky Sims sky at ecologicalsystems.biz
Sun Jan 13 16:42:17 PST 2008


William, 

For your review, I particularly like the fact that research indicates
the human body can safely handle 5 times higher DC current than AC
current: 

I took this from yahoo answers:

"Long "Technical" Answer: This answer will assume the question is
related to AC power at either 50 or 60 Hz.

IEEE 80 is the standard related to substation grounding. The paragraphs
below are from Section 5 of that document. The names and numbers in
brackets reference the endnotes of IEEE 80 which is listed in the
"Source" section below. Much of the research involved college student
"volunteers" during the 1940's and 50's.

Humans are very vulnerable to the effects of electric current at
frequencies of 50 Hz or 60 Hz. Currents of approximately 0.1 A can be
lethal. Research indicates that the human body can tolerate a slightly
higher 25 Hz current and approximately five times higher direct current.
At frequencies of 3000-10,000 Hz, even higher currents can be tolerated
(Dalziel and Mansfield [B33]; Dalziel, Ogden, and Abbott [B36]). In some
cases the human body is able to tolerate very high currents due to
lightning surges. The International Electrotechnical Commission provides
curves for the tolerable body current as a function of frequency and for
capacitive discharge currents [IEC 60479-2 (1987-03) [B83])]. Other
studies of the effects of both direct and oscillatory impulse currents
are reported in Dalziel [B25][B27]."
 source:
http://answers.yahoo.com/question/index?qid=20070704114857AA5c07v



"The current may cause tissue damage or fibrillation if it is
sufficiently high. Death caused by an electric shock is referred to as
electrocution"  source" http://en.wikipedia.org/wiki/Electric_shock


Sky Sims
Ecological Systems
www.ecologicalsystems.biz
220 County Road 522
Manalapan, NJ 07726
ph)732-462-3858  fax)732-462-3962
 

-----Original Message-----
From: William Miller [mailto:wrmiller at charter.net] 
Sent: Sunday, January 13, 2008 5:00 PM
To: RE-wrenches at topica.com
Subject: RE: Evolution of the Quick connect [RE-wrenches]


Sky:

Do you have evidence to support this conclusion?

Thanks,

William Miller


At 12:27 AM 1/13/2008, you wrote:

>With all due respect the more current there is the higher the chance
for
>injury.


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