I used to work for a telephone company. Our big sites had power plants
that put out -48V at a few thousand amps. If you dropped a wrench
across the buss bars, the wrench disappeared in a puff of smoke and a
helluva bang.
We were also warned about wearing rings or watches when working on the
equipment. You could grab the buss bar with your bare hands and not
feel a thing. 48V isn't high enough to be dangerous. But if your ring
shorted between battery and ground, the ring would burn your finger off
and cauterize the wound.
I decided that I would accept these stories on faith rather than test
them for myself. :)
Ed
On 9/9/2013 3:51 PM, Pete Lancashire wrote:
Lethal was dropping a conductor across the buss bars. If it was not the -2V
it
was -5.2V. I can't remember but it was at least 75A more like 100A.
The power supplies were in the bottom of the cabinets and tin plated copper
buss bars would run up the side of the back planes.
The back planes where wire wrapped and we were suppose to shut the power off
when making a change. A bit of 30 gauge wire didn't matter but a manual
wire wrap
tool made some pretty interesting sparks. That caused a fault.
Another had metal framed glasses. Did not even cause a hiccup to the test
program
that was running.
Ah the good days of CML, Current Mode Logic. at Burroughs.
-pete
On Mon, Sep 9, 2013 at 2:21 PM, Mark C. Stephens <ma...@non-stop.com.au>wrote:
Is 200 amperes @ 2v not lethal?
-----Original Message-----
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Pete Lancashire
Sent: Tuesday, 10 September 2013 6:58 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Wavecrest DTS 2070
-2V is a common terminator voltage for ECL
In my days before gray hair I worked on a machine that for each rack had a
200A -2V power supply, a fully configured system had over 20 racks.
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