[asterisk-biz] backup power requirements for emergency calling

[Lists]

Why are you guys discussing power outages on the Asterisk BUSINESS mailing
list?????

Take it offline for chrissake!

Tim

-----Original Message-----
From: asterisk-biz-bounces at lists.digium.com
[mailto:asterisk-biz-bounces at lists.digium.com] On Behalf Of Andrew Kohlsmith
Sent: 14 April 2006 23:08
To: asterisk-biz at lists.digium.com
Subject: Re: [asterisk-biz] backup power requirements for emergency calling

On Friday 14 April 2006 17:54, alex at pilosoft.com wrote:
> This is why asterisk guys should stick to doing asterisk, and leave
> facility management to people who know that.

Seeing as I am a field applications engineer for an industrial power 
electronics company with over ten years' of experience in this field, I find

your comment not only amusing, but also downright incorrect.

Asterisk is my hobby, but one I am very good at.

> No, it is not. You want your genset to start within 30 seconds after power
> goes out. If it doesn't start, you might have 20-30 minutes to correct the
> problem before UPS battery goes kaput.

It's all about coordination.  If you wait 20 minutes before starting the 
genset, you typically make sure you have 30-40 minutes of battery.  You also

test the generator and transfer switch once a month to make sure everything 
still works as expected.

> Also, note that 20-30 minutes runtime is about average for a facility UPS.
> So, you *definitely* do not want to drain the battery to the end before
> starting genset.

20 minutes may have been a bit of a stretch, but I typically see 50% usage
on 
the UPS before the genset is started.  You do *not* want your 600kW genset 
cycling for 2-3 minutes whenever a squirrel or raccoon falls across the
lines 
or tries to nest in the transformer and trips the breaker, especially since 
the breakers will automatically try to clear the fault 3 or so times before 
staying tripped off and notifying a human.

-A.
_______________________________________________
--Bandwidth and Colocation provided by Easynews.com --

asterisk-biz mailing list
To UNSUBSCRIBE or update options visit:
   http://lists.digium.com/mailman/listinfo/asterisk-biz