Is ringing voltage dangerous?

From: allisonp_at_world.std.com <(allisonp_at_world.std.com)>
Date: Mon Feb 28 12:09:19 2000

On Mon, 28 Feb 2000, Richard Erlacher wrote:

> I've never seen a precise write-up of what it takes to kill you, but I'd
> avoid contact with voltages such as this just to avoid the pain.

Over the years BYTE, PopularElectronics, RadioElectonics and many texts
(none I have) have covered it. the key element is NOT Voltage but, the
current flow it can induce through a largely resistive body. The currents
range from about 60MA (considered deadly if across the chest) to 20uA
which is down around the threshold level. Also DC vs AC and what
frequency the effects vary. HF(above several MHZ) AC for example is more
likely to cause burns before muscle spasms.

RULE 1, unless the voltage is very low it _can_ be dangerous. Low is hard
        number be exact about but, over 12-30V is the watch out zone.
RULE 2, All efforts are to be made to avoid crossing the heart or chest
        as a possible path for safety. One hand in pocket rule is derived
        from this.
RULE 3, if you not sure, make sure. get a meter and find out if it's live
        and how hot hot is.

Over the years working with RF and transmitters I've been hit with RF and
DC to 1800V (ouch!) and LF AC power to 200V/400hz. Some were annoying,
a few painful, one nearly bluecrossed me and the better ones left scars
(and a willingness to NOT stick fingers in).


Allison
Received on Mon Feb 28 2000 - 12:09:19 GMT