Re: [CAD_CAM_EDM_DRO] Re: Shock Warning

Wrong!

Voltage (E.M.F. {Electro Motive Force}) is, as was stated
earlier, the driving force behind electricity. Current (the killer) is the
result of that Voltage divided by the Resistance of the load (In this case,
You). The thicker you are the better yor chances are of surviving :-))

In the case of your Welder of 35 Volts, through your body
resistance: You will certainly feel it, but there simply isn't enough
Voltage to develop a killing current. An exception to this, of course, is
if you have a dicky ticker.

In the case of a colour T.V. The Voltage on the tube Anode is in
the region of 48,000 Volts, but the current capacity of the driver circuits
is very limited. You certainly know that you have had a belt, if you
venture into the back of one of these babies. What happens though, is that
the initial shock is likely to toss you, literally, across the room, and
out of further harms way. If you are unfortunate enough to get hung up in
the wires, your body resistance will likely shunt the voltage driver
down. I know at least two people, with high body resistance, who can
literally hang onto these things. Think of a Morris Minor in a head wind.

In the case of a Microwave oven. Voltage available at the
magnetron is in the region of 5000 Volts. This is delivered directly from
an auto transformer, connected to the mains supply. Driving voltage is
high enough to generate killing currents in most human bodies. Power supply
is backed up by the entire power grid system. If you don't have the right
tools, and you don't know what you're doing, don't EVER go into the back of
a Microwave oven. Even if they have been turned off, for some time, they
can be lethal. Shorting the capacitor with a screw driver is not
recommended, unless you want to wear a face full of disintegrating
screwdriver shards.

Electricity is no joke. It sneaks up on you at 186,000 miles /
second (300,000 Metres / second). Let's keep you all safe.

Jawj

ZL3THI

Just left of downunder.







At 20:43 18/08/02, you wrote:

> >--- In CAD_CAM_EDM_DRO@y..., Keith Green <ksgg@s...> wrote:
> > Volts don't kill; amps do. Usually the worst is less than 1A
> > (near to
> > your body's current) where it interrupts your heart. Volts would
> >just be the
> > "penetrating power" of the charge. If you've got bleeding hands and
> >are
> > standing barefoot in a puddle of salt water, it wouldn't take
> >much...
>
>So if I touch the leads on my big welder that's rated at 35 volt 300
>amp I'm dead?
>Funny that stick welders are sold over the counter with NO warning on
>them about the danger of getting killed by the output leads.
>
>John S.
> >
> >
> > keith
> > ----- Original Message -----
> > From: "mayfieldtm" <mayfiet@i...>
> > To: <CAD_CAM_EDM_DRO@y...>
> > Sent: Saturday, August 17, 2002 1:58 PM
> > Subject: [CAD_CAM_EDM_DRO] Shock Warning
> >
> >
> > > --- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...>
>wrote:
> > > >
> > > > You have to work very hard to get shocked by voltages less than
> > > > 80VDC. It may tickle a little bit but that's about it.
> > > >
> > >
> > > True, but don't forget that human skin is an insulator.
> > >
> > > If you-all are like me, whenever I work around machines, tools and
> > > sharp things like chips and tool bits, my hands often have
>numerous
> > > cuts.
> > >
> > > Be very careful when poking around with electrics with a cut
>finger.
> > > Even 12 volts can be lethel under just the wrong conditions.
> > > Or so I've heard, (could be just a tall tail)
> > > If nothing else, it might make you do the Jig.
> > >
> > > Tom M. :~(
> > >
> > >
> > >
> > >
> > > Addresses:
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> > > FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> > >
> > > OFF Topic POSTS: General Machining
> > > If you wish to post on unlimited OT subjects goto:
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>reach it if
> > you have trouble.
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> > >
> > > http://groups.yahoo.com/group/jobshophomeshop I consider this
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>
>Addresses:
>FAQ: http://www.ktmarketing.com/faq.html
>FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
>OFF Topic POSTS: General Machining
>If you wish to post on unlimited OT subjects
>goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to
>reach it if you have trouble.
>http://www.metalworking.com/news_servers.html
>
>http://groups.yahoo.com/group/jobshophomeshop I consider this as a
>sister site to the CCED group, as many of the same members are there, for
>OT subjects, that are not allowed on the CCED list.
>
>NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING
>THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
>
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>bill,
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>List Owner
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>
>
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