"Jerry" wrote in message
news:t6wkj.11471$9t4.10690@trnddc08...

"MG" wrote in message
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"Jerry" wrote in message
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"Nick Mueller" wrote in message
...
azotic wrote:

Simply shocking what some people do.

That photo is a fake.
http://www.linuxno.de/_data/gallery/nwl7/_medium_DSCN7830.JPG
http://www.linuxno.de/_data/gallery/nwl7/DSCN7821.JPG


Nick
--
The lowcost-DRO:
http://www.yadro.de

Hi Nick

You are a thinking kind of guy. What is your thought about what would
happen if the cord *was* plugged in to a generator? (A generator with
no connection to ground.)
I thought that socket was for 200 volt cirtuits. If the socket did
have ~200 volts between terminals, and they both contacted the water, is
it likely that the people would be in a high potetial area?
Does anyone know what happens if 220 VAC across terminals spaced 1 inch
apart is imersed in swimming pool water?

Jerry

On straight line connecting the terminals the gradient is 220V/inc
therefore an ant 1/2" long midway between the terminals would feel like
touching a110V outlet with the hand while standing on the neutral wire.

To visualize the electrical field emanating from the socket, allow some
simplification and inaccuracies, still leaving the concept intact.
If you draw a circle 10 feet in diameter centered 5 feet from the outlet
on a line perpendicular to the 1" spacing, you can think as the 220V are
evenly spaced across the 31.4 feet of the circumference.
A man 6 feet tall floating tangent to such circle will be exposed to
6x220/31.4 or nearly 40V.
If the man was standing in the water on the same circle, at breast level,
arms down, looking toward the outlet,
the 2 feet or so across its thorax would feel about 13V.

For every roughly circular path you can draw around the outlet you can
apply the same concept, the voltage gradient will be 220/path-lenght.

In reality the lines of constant gradient are not circles even under
ideal conditions. I a real pool depend from the water composition and
distribution, the location and conductivity of the wall and the
structures immersed, swimmers included and their geometry.

For example if the wall were made of copper, then the voltage between any
two points would be minuscule.

Mauro

Hi Mauro

As I read your post above, it appears that there is little danger to the
guys shown in the picture. Did I read it right??

Jerry


First the assumption of a "floating" generator you expressed is not
guaranteed in the pictures, the source may be grounded on one side, in that
case things get complicated, the man can be touching the bottom (grounded)
and be close to the Hot side and get 220V.

Second what I wrote is based MY understanding basic physic principles,
before anybody risk THEIRS lives to verify this they should make their own
research.

The common wisdom of not mixing water and electricity is fundamentally
sound.
Large, wet skin surfaces loaded with body weight are better contact (lower
resistance) than a dry fingertip gently brushing a small electrified screw
head, for example.

Ultimately, is not necessarily the voltage that is dangerous, is the current
across the body muscles, particularly the hearth.
Some of the voltage available from the generator is "lost" to push the
current across all the connections and what is left is actually across the
body.

The official safe voltage is around 40V, I do not remember the details, the
lowest body resistance is 2000 ohms and a current of 10 mA through the
hearth is often lethal.

The fact that 40V across 2000 ohms produces 20mA and the voltage is still
considered safe may be rationalized by considering that not all the current
is going to flow through sensitive organs.

Mauro