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Lock5
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![[*]](./images/xpsilver/default_icon.gif) posted on 3-4-2010 at 04:16 PM |
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| Quote: | Originally posted by locknut
a half of a milli-amp can take you out if there is enough voltage behind it. least that's what I remember from heating/air school, a looong time ago
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also was told that even tho a circuit breaker is in the 'off position' if it's faulty.electricity can still sometimes travel through it and knock
you on your keister. or worse  |
Just the opposite, static electricity is crazy high volts, but very little amps. Think of volts as the speed of the bullet and amps as the diameter of
the lead.
"Some people spend an entire lifetime wondering if they made a difference. The Marines don't have that problem."
PRESIDENT RONALD REAGAN, 1985
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squakmeister
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| posted on 3-4-2010 at 05:55 PM |
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From Ohio State University
The Fatal Current
Strange as it may seem, most fatal electric shocks happen to people who should know better. Here are some electro-medical facts that should make you
think twice before taking that last chance.
It's The Current That Kills
Off hand it would seem that a shock of 10,000 volts would be more deadly than 100 volts. But this is not so! Individuals have
been electrocuted by appliances using ordinary house currents of 110 volts and by electrical apparatus in industry using as little as 42 volts direct
current. The real measure of shock's intensity lies in the amount of current (amperes) forced though the body, and not the voltage. Any electrical
device used on a house wiring circuit can, under certain conditions, transmit a fatal current.
While any amount of current over 10 milliamps (0.01 amp) is capable of producing painful to severe shock, currents between 100 and 200 mA (0.1 to 0.2
amp) are lethal. Currents above 200 milliamps (0.2 amp), while producing severe burns and unconsciousness, do not usually cause death if the victim is
given immediate attention. Resuscitation, consisting of artificial respiration, will usually revive the victim.
From a practical viewpoint, after a person is knocked out by an electrical shock it is impossible to tell how much current has passed through the
vital organs of his body. Artificial respiration must be applied immediately if breathing has stopped.
The Physiological Effects of Electric Shock
The chart shows the physiological effects of various currents. Note that voltage is not a consideration. Although it takes voltage to make current
flow, the amount of shock-current will vary, depending on the body resistance between the points of contact.
As shown in the chart, shock is relatively more severe as the current rises. For currents above 10 milliamps, muscular contractions are so strong that
the victim cannot let go of the wire that is shocking him. At values as low as 20 milliamps, breathing becomes labored, finally ceasing completely
even at values below 75 milliamps.
As the current approaches 100 milliamps, ventricular fibrillation of the heart occurs - an uncoordinated twitching of the walls of the heart's
ventricles which results in death.
Above 200 milliamps, the muscular contractions are so severe that the heart is forcibly clamped during the shock. This clamping protects the heart
from going into ventricular fibrillation, and the victim's chances for survival are good.
Danger - Low Voltage
It is common knowledge that victims of high-voltage shock usually respond to artificial respiration more readily that the victims of low-voltage
shock. The reason may be the merciful clamping of the heart, owing to the high current densities associated with high voltages. However, lest these
details be misinterpreted, the only reasonable conclusion that can be drawn is that 75 volts are just as lethal as 750 volts.
The actual resistance of the body varies depending upon the points of contact and the skin condition (moist or dry). Between the ears, for example,
the internal resistance (less the skin resistance) is only 100 ohms, while from hand to foot is closer to 500 ohms. The skin resistance may vary from
1000 ohms for wet skin to over 500,000 ohms for dry skin.
New Jersey State Council of Electrical Contractors Associations, Inc.
Bulletin VOL. 2, NO. 13
February, 1987
Submitted by Paul Giovinazzo
Source: http://www.physics.ohio-state.edu/~p616/safety/fatal_current.html
squakmeister has attached this image:
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Rather_B_Boatin
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| posted on 3-4-2010 at 06:02 PM |
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Great information, thanks Squak.
To answer the thread question, I have not changed my mind... still not going to swim at the marina!
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Lock5
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| posted on 3-4-2010 at 06:59 PM |
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My reference to a bullet was just as informative as Squak's essay..........
"Some people spend an entire lifetime wondering if they made a difference. The Marines don't have that problem."
PRESIDENT RONALD REAGAN, 1985
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Randy
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| posted on 3-4-2010 at 08:02 PM |
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Absolutely not!! (till it reaches 80)
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Awakening
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| posted on 3-4-2010 at 11:55 PM |
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| Quote: | Originally posted by Lock5
My reference to a bullet was just as informative as Squak's essay.......... |
When explaining volts and amps to people I usually use the dog shock collar example, lots and lots of volts, hardly any amps....... then I try to
convince them to do a field test using a collar 
3 time winner of the prestigious LC.COM Member of the Day Award...... OH YEAH!!!!
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Awakening
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| posted on 3-4-2010 at 11:58 PM |
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| Quote: | Originally posted by WaterWings
Thanks Awakening for bringing up a very valid concern. Like they say about printing pictures on milk cartons, if we save just one child... its worth
it.
You are certainly in line for a "third" LC.COM Member of the Day Award...ahhh heck...its yours. |
Thanks man!
I will try to stay up on this issue for all of us 
3 time winner of the prestigious LC.COM Member of the Day Award...... OH YEAH!!!!
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Six Pack Summer
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| posted on 3-5-2010 at 08:38 AM |
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Awakening, that was a good topic and a lot of information came out of it.
Here comes the but. If I hear another politician or someone else say "We have to do it for the children" I could just spit. You had me all the way
until you said that. What office are you running for?
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Watt Money
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| posted on 3-5-2010 at 08:55 AM |
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| Quote: | Originally posted by squakmeister
It's The Current That Kills
Off hand it would seem that a shock of 10,000 volts would be more deadly than 100 volts. But this is not so! Individuals have
been electrocuted by appliances using ordinary house currents of 110 volts and by electrical apparatus in industry using as little as 42 volts direct
current. The real measure of shock's intensity lies in the amount of current (amperes) forced though the body, and not the voltage.
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I remember a story I heard on the news about a guy in Circleville Ohio who was found dead in the trunk of
a car. He was installing a high powered audio system and had several batteries on the floor of the trunk and apparently layed on them to do something.
Autopsy revealed that he was electrocuted. I was (no pun intended) shocked to hear that could happen with 12 volts. I'm an electrician and knew it
was the current that gets ya but man I never thought that low of voltage could. Gained a whole lot more respect of electricity after hearing that.
"Heap big trouble in the land of plenty, Tell me how we're gonna do whats best, You guess once upon a time in the west" Mark Knopfler
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NearlySatisfied
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| posted on 3-5-2010 at 04:10 PM |
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All the contracts I have signed from each marina I have been at clearly state there is "No Swiming at the Marina". I think this policy is there for
a reason but it is amazing on any given day at the dock, how many people are in the water behind their boats.
It's either "screw the rules" or they just don't care about their or their own's safety.
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fryman
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| posted on 3-5-2010 at 04:23 PM |
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| Quote: | Originally posted by Six Pack Summer
Awakening, that was a good topic and a lot of information came out of it.
Here comes the but. If I hear another politician or someone else say "We have to do it for the children" I could just spit. You had me all the way
until you said that. What office are you running for? |
Pretty good at drinking beer....
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Awakening
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| posted on 3-5-2010 at 05:02 PM |
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| Quote: | Originally posted by Six Pack Summer
Awakening, that was a good topic and a lot of information came out of it.
Here comes the but. If I hear another politician or someone else say "We have to do it for the children" I could just spit. You had me all the way
until you said that. What office are you running for? |
yeah I went back and re read it and yeah it does sound like I am
running for office
But serisouly, that is all I think about when I see people swimming in the marina is the kids. I could care less if you adults get zapped..... more
cove space for me
I'm going to go ahead and call dibs on the Horseshoe when you get zapped Six Pack.
3 time winner of the prestigious LC.COM Member of the Day Award...... OH YEAH!!!!
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fryman
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| posted on 3-5-2010 at 05:05 PM |
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Pretty good at drinking beer....
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Six Pack Summer
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| posted on 3-5-2010 at 05:36 PM |
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I don't swim in the marina so no chance of me getting zapped. I do it just for the children, if you know what I mean.
If I see you at the horseshoe just be sure I have enough room to pull in beside you. Same goes for you fryman and the lovely squirrel.
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another round
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| posted on 3-6-2010 at 02:22 PM |
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From what I recall you do swim in the marina. Last October!!! In all your clothes!!! It sounded as though you were getting shocked. So next time, you
get no help getting out.
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yeahbuddy
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| posted on 3-9-2010 at 09:53 PM |
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For that matter then, Squak, wouldn't the same thing happen with a shorted out generator wire or an inverter wire, if not properly installed?
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fryman
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| posted on 3-10-2010 at 05:01 PM |
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| Quote: | Originally posted by Six Pack Summer
I don't swim in the marina so no chance of me getting zapped. I do it just for the children, if you know what I mean.
If I see you at the horseshoe just be sure I have enough room to pull in beside you. Same goes for you fryman and the lovely squirrel.
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Always got room for ya!
Pretty good at drinking beer....
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