[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re[2]: [datacenter] About raised floors

On Mon, 20 Jan 2003 16:51:41 -0800 (PST) "quique.org" <[email protected]> wrote:
> It will be used for HVAC but there's a duct for data 
> cabling and another one for electrical cabling.

you will need to make sure that folks doing cabling don't get sloppy and
start leaving stuff outside of the provided cable trays. an occasional
audit of the underfloor area can be a good thing.

> But it's a good option to have data cables running on 
> ladder racks. do you think it's fine to run powercables 
> on ladder racks?

i'd avoid it. see below.

> I've read a recommendation that say 
> whenever possible data and power cables should 
> intersect perpendicularly or at least keep them 6 
> inches apart if you have to run them parallel. I'm sure 
> it's cheaper to run them on ladder racks but you know 
> marketing people says it looks bad ... hide them.

the last time i went through this, code required conduit for power, so we
dropped conduit from the drop ceiling down to the floor mounted racks.
this was all 2 post relay racks, which had to be lag bolted to the concrete
floor anyway, so tying them into the structure with the electrical conduit
was no big deal.

i'd be really disinclined to run loose power cables (120VAC or whatever)
through ladder rack intended for carrying low voltage signal cable. i don't
see a need for this.

as for what marketing people, they say all kinds of stupid things. don't
let them muck up your datacenter for stupid reasons. the first one i ever
did had _way_ too much marketing input for its own good. problem was that
we didn't really have the budget to pull off "way cool", so it just looked
like a shabby, lame, underfunded attempt at "way cool". not worth it,
functional for me from now on.

> No, HVAC will need an supply air plenum, and ADA, well 
> I'm out of the states but does it means American with 
> Disabilities Act? well, it doesn't apply here but I'll 
> take in consideration their recommendations ... one 
> more item for my to-do list.

basically, the ADA specifies landings sizes at the tops and bottoms of
ramps, the directions that the doors swing in, and stuff like that for
wheelchair accessibility. for example, it's all well and good to provide a
landing, but if the door swings the wrong way, then it can't actually be
used. it's all really common sense kind of stuff, if you bother to think it
through, but often people don't, or it costs more money to do it right, or

> P.D. Do you have http://datacenters.lbl.gov ?

not before now, but i'll put it on the list for review.

i'm working on a little php/postgresql link manager so i don't have to
repeat the pain i just went through of fixing the sun datacenter guide
link in numerous places. no changes to the web site until i have the db
backend deal set up and running.

Richard Welty                                         [email protected]
Averill Park Networking                                         518-573-7592
              Unix, Linux, IP Network Engineering, Security

To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]