Re: DATACENTER: power requirements

[Martin Hannigan <hannigan@shore.net>]

Hi Dave,

I still think you're talking AC, and I'm talking DC. 

-M


[Charset iso-8859-1 unsupported, filtering to ASCII...]
> In any event, it probably doesn't matter. If you are going into a colocation
> scenario and they sell you 100A, I'm sure they're not going to say if
> you can prove you only use 90A, we'll discount you. I think colo pricing
> is pretty static in that respect.
> 
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<,
> 
> Marty,
> 
> As has already been pointed out the Amperage of a circuit is the MAXIMUM
> load that it will carry before flipping the breaker or blowing the fuse, it
> is not a constant load.  Plus add in the comment made about devices taking
> more power to startup, and you are playing a game with no way to win.  Don't
> forget to figure in when someone attaches some little device (cell phone,
> lamp, clock / radio)temporarily to the circuit and causes you to exceed the
> capacity.
> 
> Don't laugh, I have seen situations where a technician has plugged in a
> laptop which caused an overload and flipped the breaker causing a production
> outage at the center of a large corporations network.
> 
> The amperage of a circuit is much like the speed of a communications link.
> Just because you might have a 100 Mb/s fast ethernet card installed to the
> router doesn't mean that you are constantly running 100Mb/s of traffic to
> that router.  You just will just have problems as you approach that limit,
> and you can not exceed that limit.  In fact we have some routers that will
> probably never see 100 Mb/s on a link, but to eliminate problems we run it.
> 
> I don't ever like to have more than 60-70% load on an electrical circuit to
> allow a little extra for startup.  That being said, I also like dedicated
> circuits for large devices such as MMAC's and 75xx series routers.  It costs
> a little more but the minimal cost is made up by the reliability of my
> network.
> 
> 
> Dave Greer
> 
>