[NSRCA-discussion] Question.

[Dowayne Gould]

I work on trucks that have 4 900cca batteries wired in parallel. On a hot
sweaty day 12v running down your arm is down right uncomfortable. Getting
hit with a quad flash strobe set up will make a guy mean the rest of the
day.

On Aug 20, 2010 1:10 PM, "Atwood, Mark" <atwoodm at paragon-inc.com> wrote:

 From Underwriter Lab documents….



Testing in 1950s determined that a

shock and let-go value of not greater than 42.4 volts was

an acceptable level in most dry locations and would not

be lethal to a person in contact with the circuit. This

value of 42.4 volts peak would not be acceptable in a wet

location since the resistance of a person’s body would be

much lower in a wet condition.



It’s extremely person to person dependent.  Our skin resistance varies
wildly and the difference between Dry skin and Wet skin is something like
100,000 ohms to 1,000 ohms.  Sort of a wide range.



But again, the “generally accepted” safe low voltage is 40V, or in the case
of UL Listing, 42.4.



I have to believe that played a big role in the FAI guideline initially of
not exceeding 42V.



AC current is different, both more and less lethal.  More because it
fibrillates the heart, but less because you have a chance of letting go.
Very situation dependent.









Mark Atwood

Paragon Consulting, Inc.  |  President

5885 Landerbrook Drive Suite 130, Cl...

mark.atwood at paragon-inc.com  *|*  www.paragon-inc.com



*From:* nsrca-discussion-bounces at lists.nsrca.org [mailto:
nsrca-discussion-bounces at lists.nsrca.org] *On Behalf Of *Bob Richards
*Sent:* Friday, August 20, 2010 12:01 PM


To: General pattern discussion
Subject: Re: [NSRCA-discussion] Question.



>>>The voltage in a battery is not the lethal element, current of Amperage
is.<<<





So are you saying that a 1 cell 5000mah pack is dangerous enough to kill
1000 people? :-)



A...



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