RE: Why do we use facilities with EPO's?

["Alex Rubenstein" <alex () corp nac net>]

In fact, an EPO system is a single point of failure...

And, whether or not you need an EPO in your center is wholly up to you,
and how you design your center. 

As mentioned at a recent seminar I went to:

"If you do not need to install non-plenum rated cable below a floor, and
you require boxes under the floor to be secured, and you do not state
NFPA 75 as your standard, then you do not need an EPO as defined by NEC
645."

Only if you want exceptions granted in 645 ("Information Technology
Equipment"), should you have to install an EPO.

EPO = SPOF = bad. We all know this.



> > If they can be avoided, why do we put up with them?  Do we really
> > want our colo in downtown San Francisco bad enough to take the risk
> > of having a single point of failure?  How can we, as engineers, ask
> > questions about how many generators, how much fuel, and yet take
> > for granted that there is one button on the wall that makes it all
> > turn off?  Is it simply that having colo in the middle of the city
> > is so convenient that it overrides the increased cost and the
reduced
> > redundancy that are necessitated by that location?
>       You forgot the default "Single Point of Failure" in anything..
>
>                       HUMANS.
>
>                               Tuc/TBOH