[sdw2003] Re: Whole building UPS...?

[Michael J McCafferty]

	Most data centers and hospitals, etc. can have 3 classes of power.

1) On UPS batteries. This is for "critical load". servers, life support
systems, operating room equipment, etc. This is designed to be
uninterrupted during a power event.

2) On Generator. If the power goes out, then these systems go down until
the the generator comes up. Usually this includes HVAC and in data
centers it usually includes the CRAC or CRAH units. This load can be
interrupted briefly during a power event.

3) "Street power" which comes from SDG&E here in San Diego. It's
non-critical load. If the power goes out, then this does too. Why put
hallway electrical outlets on the expensive UPS and Generator if the
only time it's used is for the cleaning crew to vacuum at night? This
can be interrupted any time for any reason, it's not critical and can be
down for the duration of a power event.

	Buildings may have 1, 2 or all 3 of the above types of power depending
in different places for different uses. Often they are indicated by what
color the faceplate is for the electrical outlet.
	Business decisions can be made to determine what and how much goes
where. Type 1 is very expensive, 2 pretty expensive, 3 is what your used
to.
	It's not very likely that an entire building would be on Critical Load.
People who say that are usually misinformed.

Mike

On Thu, 2010-01-21 at 17:25 -0800, Tracy Reed wrote:
> On Thu, Jan 21, 2010 at 05:19:51PM -0800, Randall Shimizu spake thusly:
> > I am starting to hear about UPS systems (Whole building UPS) that
> > protect a entire building...? Is anyone doing this locally..?
> 
> Pretty much any datacenter/colo worth being in does this. There are a
> number of such places in San Diego including the building where this
> email originates.
> 
-- 
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