Mailinglist Archive: opensuse (2496 mails)

[James Knott <james.knott@xxxxxxxxxx>]

Carlos E. R. wrote:
>    A coworker once fell down from a... what do you call it, a portable
>    stairs, when he was connecting power at a exchange, with a screwdriver
>    on his hands. This fell across the two naked dc lines... after some
>    sparks an entire island resulted without cellular coverage for some
>    hours :-}
Anyone with experience in telecom could probably tell about similar
situations.
> I wonder, those servers you mention, can be adapted to both type of
> grounding? And how is the price compared to ac power unit, if you
> remember? Not a figure, just curious to know if they are more
> expensive or not.

As I mentioned in another note, it's often your choice, though I don't
know specifically about HP.  Modern power supplies are switchers, which
convert the incoming power (AC or DC) to high frequency AC, passed
through a transformer and then rectified, filtered & regulated at the
desired output voltage(s).  Because the supply input and output are
separated by that transformer, they can be completely isolated and
grouded as required.  So, on equipment, you'll find +, -  and ground
terminals, with no connection between ground and either power terminal.

-- 
Use OpenOffice.org <http://www.openoffice.org>

-- 
To unsubscribe, e-mail: opensuse+unsubscribe@xxxxxxxxxxxx
For additional commands, e-mail: opensuse+help@xxxxxxxxxxxx