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Message Digest
Volume 28 : Issue 130 : "text" Format
Messages in this Issue:
Re: CO backup power (was Re: FiOS in MDU Buildings
Re: CO backup power (was Re: FiOS in MDU Buildings
Re: CO backup power (was Re: FiOS in MDU Buildings)
Re: CO backup power (was Re: FiOS in MDU Buildings
Re: CO backup power (was Re: FiOS in MDU Buildings
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Date: Mon, 11 May 2009 17:22:48 +1000
From: David Clayton <dcstar@myrealbox.com>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: CO backup power (was Re: FiOS in MDU Buildings
Message-ID: <pan.2009.05.11.07.22.47.867008@myrealbox.com>
On Sun, 10 May 2009 20:44:22 -0400, Who Me? wrote:
.......
> Except for a bomb or fire, there isn't really much that will damage a
> 2.1 volt CELL that stands 4 feet high and is about 16 inches square;
> they really aren't fragile, mechanically OR electrically!
<humor>
And you can test their charge by dropping a set size piece of metal across
the contacts - if the metal vaporises then they are fully charged! ;-)
</humor>
--
Regards, David.
David Clayton
Melbourne, Victoria, Australia.
Knowledge is a measure of how many answers you have, intelligence is a
measure of how many questions you have.
***** Moderator's Note *****
I inserted "humor" warnings around David's joke. Sorry if that's
gilding the lily, but I always whistle when passing a graveyard.
Bill Horne
Temporary Moderator
------------------------------
Date: Mon, 11 May 2009 11:03:46 EDT
From: Wesrock@aol.com
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: CO backup power (was Re: FiOS in MDU Buildings
Message-ID: <d1c.41fc3371.37399852@aol.com>
In a message dated 5/10/2009 7:44:49 PM Central Daylight Time,
hitchhiker@dont.panic writes:
> Ahem. No battery is designed to float. They are designed to
> provide power ... and float when not doing that. I worked in those
> offices for 25 years and I assure you that their capacity to provide
> that power WAS tested regularly.
Usually [they were tested] every Wednesday morning at 8 a.m. In
autostart offices, the commercial power was disconnected automatically
to make sure the automatic transfer system and autostart system were
working right, as well as making sure the generator (usually called
the emergency engine) was working properly, too.
Wes Leatherock
wesrock@aol.com
wleathus@yahoo.com
***** Moderator's Note *****
Why would commercial power be disconnected automatically? If the
objective was to test the automatic equipment, wouldn't the testers
need to cut off the commercial mains manually?
Bill Horne
Temporary Moderator
------------------------------
Date: Sun, 10 May 2009 21:18:06 -0400
From: Steve Stone <spfleck@citlink.net>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: CO backup power (was Re: FiOS in MDU Buildings)
Message-ID: <gu7ucl$ecd$1@news.motzarella.org>
> Memory fades over time, but I recall the basement filled
> with the largest lead acid battery farm I'd ever seen. ...
The biggest battery backup I've ever seen was in the early 1980's
while taking a tour of a AT&T satellite feed [antenna] farm in
Kimbles, PA near Lake Wallenpaupak. The dishes were more than huge.
------------------------------
Date: Sun, 10 May 2009 19:26:02 -0700 (PDT)
From: hancock4@bbs.cpcn.com
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: CO backup power (was Re: FiOS in MDU Buildings
Message-ID: <91a7a3a9-24b5-493a-866b-87a06b429cd4@21g2000vbk.googlegroups.com>
On May 10, 8:45 pm, "Julian Thomas" <j...@jt-mj.net> wrote:
>> I think your memory is failing you. All the #1 ESS offices in
>> Illinois that I visited/worked in ... which were a LOT, had battery
>> power for about 4 hours
>
> Maybe, but my memory was from how it was 'supposed to work' a few
> years before Morris went live.
Again, I respectfully disagree. As I recall the history, "a few years
before Morris went live" there wasn't much of anything, just designs
on paper. I'd have to check the Bell Labs history. Once again,
Morris was _not_ a production installation, but a special test site.
They knew at the onset the hardware would not be used in production;
it was more of testing the concept of stored program control.
Once again, in electronic terms, 1/3 of a second is a very long time,
far too long for electronic circuits to wait for a power stoppage.
Even back then electronic clock [cycles] were [measured] in
thousandths of a second.
Further, diesel technology back then was still crude enough that "1/3
second fast start" was quite advanced and not dependable enough for a
mission critical function like a C.O. They simply couldn't take the
chance that the generator engine might have to "crank" a few times
before kicking in.
------------------------------
Date: Mon, 11 May 2009 02:42:20 -0700
From: Sam Spade <sam@coldmail.com>
To: redacted@invalid.telecom.csail.mit.edu
Subject: Re: CO backup power (was Re: FiOS in MDU Buildings
Message-ID: <0qSNl.54614$ew.21875@newsfe24.iad>
David Lesher wrote:
> "Who Me?" <hitchhiker@dont.panic> wrote:
>
>> Not really practical to start a diesel that quickly ... because it
>> (usually) needs to warm up a bit for the speed to stabilize before you
>> cut the load to it.
>
> The Diesels at a nuke plant are kept heated and have "start & provide
> power" times in the low single-digit seconds; they are how you power an
> emergency shutdown...
But, unlike an unattended central office, hopefully the operators will
have brought the diesel generators on-line at a nuclear power plant
while [implementing] a check-list that gets them running before they
are actually required to be brought on-line.
If, on the other hand, the starting of diesel generators at a nuclear
power plant [has to be on] that [kind of] "hair trigger" then perhaps
the opponents of nuclear power generating stations are correct, and
our next TMI could happen any time.
[moderator snip]
***** Moderator's Note *****
This thread is getting hotter than a loose bus bar in busy hour: let's
tone it down an octave or two. I _DON'T_ want to have a debate about
nuclear power!
And, _PLEASE_, pay more attention to spelling and grammar! I know it's
Spring, and I know it's hard to review your posts when you're (pun
intended) charged up, but have mercy on the moderator, OK?
Bill Horne
Temporary Moderator
------------------------------
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End of The Telecom digest (5 messages)
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