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'[SOT] safety ground'
1999\02\16@171703 by Reginald Neale

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Sean asked:

>I know that the danger is MUCH greater when one contacts BOTH the hot and
>ground with parts of their body,but is this the only (theoretically)
>dangerous situation?
>
 Well, sure. You have to complete a circuit in order for current
 to flow. OTOH it only takes a few mA to kill you, and if you're already
 holding on to one side of the line, just about everything in your
 environment is a potentially fatal closure for that circuit.

 This is like saying "It's OK to stand on the edge of a cliff." I guess
 it's true. As long as you're careful not to fall off there's no
 danger.

 Reg Neale

1999\02\16@172509 by Sean Breheny

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I understand what you mean, and I NEVER meant to say that it was SAFE to
hold onto a 120v line. I have just been set a'wonderin since so many
non-electronically inclined people claim to have received shocks by just
touching the hot wire (i.e. a frayed cord, mis-wired lamp socket,etc). It
would seem odd to me that in a world so dominated by plastic and non-metal
floors and furniture, that electric shock should be so common.

Sean



At 10:15 PM 2/16/99 GMT, you wrote:
{Quote hidden}

| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
\--------------=----------------
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1999\02\16@223058 by Gerhard Fiedler

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At 17:23 02/16/99 -0500, Sean Breheny wrote:
>I understand what you mean, and I NEVER meant to say that it was SAFE to
>hold onto a 120v line. I have just been set a'wonderin since so many
>non-electronically inclined people claim to have received shocks by just
>touching the hot wire (i.e. a frayed cord, mis-wired lamp socket,etc). It
>would seem odd to me that in a world so dominated by plastic and non-metal
>floors and furniture, that electric shock should be so common.

i think you can definitely =feel= it. it may not be harmful to most people,
and the sensation will probably depend on a lot of individual and
circumstancial factors -- it's a bit like touching your girlfriend's arm or
so... :)

ge

1999\02\16@232920 by Wagner Lipnharski

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Let's understand this, you can suffer a large electric shock even if you are jus
t floating in the air and touching an electric charged device, with a charge dif
ferent from the
ground.

Remember the Van-der-Graf generator?  Hair all dischargind electrons to the air?

What happens is that everything conducts electricity, in different amounts, even
air.   A very common way to produce a "false" ground in some places (and I saw
some) where they
really don't have a grounded metalic structure, is just attach the equipment gro
und wire to a large metalic frame, like a aluminum window, even if it is just co
nnected electrically
to nothing else. It will not works as a real ground, but it will dissipate any p
eak discharge in some way better than nothing.

The same happens to a lady ironing clothes over a vinyl tile on the kitchen, wea
ring plastic shoes, touching the live (phase) uncaped wire... she feels it and i
t can be strong,
mainly if she is stressed, sweating, favoring all the details for the tinny litt
le electrons flow, to the air...

You can trip those GFI (ground fault i?) outlets just grabbing the live phase wi
thout touching nothing else and wearing rubber shoes...

              "Long live to the ANTENNA Man"


Wagner Lipnharski
UST Reserach Inc
Orlando, Florida
http://ustr.net


Sean Breheny wrote:
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