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I can touch each post of a car battery, but the reason that it
dont flow
up one arm, across my chest and down to the other, is the same
reason why
these low voltage caps are not dangerous... the voltage is too
low to start
an arc thru the skin. however, were an arc to get started, as
with a wrench
across the posts, the 300 amps or so that results will melt the
wrench, and
burn the bejezzus out of the fingers holding it.
Skin has resistance; dry skin has a lot of it. The probes on my
DVM only
are good for 2 meg, and in my hand, they start at 1.6m ohm, and
as the
capacitive nature of my skin charges up, it quicklys goes to
1.9megohm,
and then off scale. The highest voltage of the ATX is 12vdc; at
2meg
resistance the amperage is 6 microamps. Which is why I dont feel
anything.
Likewise, you can safely handle bare telco UTP wire ends.
usually at
48-52vdc, dry skin feels nothing. but if you lick you fingers
you feel a
jolt, but in this case, their equipment only supplies 5ma to the
local loop
24awg wire... so it aint dangerous.
Ben A L Jemmett wrote:
>
> > I'm grateful as well for the SMPS page. but look at the caps.
> > they rate at 12 or maybe 20v peak. I aint afraid of getting
> > zapped by the low voltages in a pc power supply.
> > It aint like a tv that needs 17kv to run the crt.
> Remember: 'It's the volts that jolts, but the mills that kills.'. The
> voltage is not of much concern. It's the current that's the worry. It
> doesn't take an amp across the chest to kill a human, and those little
> capacitors will discharge quite a large amount in very little time if you're
> not careful. I've (intentionally) been hooked up to a couple of milliamps
> at 6000 volts without feeling more than a slight tingle in my fingertips -
> but even at quarter of an amp I would be very careful of anything more than
> a couple of volts.
>
> Regards,
> Ben A L Jemmett.
> (http://web.ukonline.co.uk/ben.jemmett/, http://www.deltasoft.com/)
>
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