[GRLUG] Plenum Cable

[Michael Glaske]

Just look at your return air ducts in the drop ceiling.  If they are just
open grates, then your return uses the plenum.  If they have ducts that lead
back to the furnace, then you do not need plenum cable.  :)

On Thu, Jul 28, 2011 at 3:11 PM, Benjamin Flanders <flanderb at gmail.com>wrote:

> We are moving a closet shortly and I will need to string some more
> cable.  With that in mind I was going to buy some cable and came up
> with a term that is new to me, "Plenum".  It turns out that the
> airspace above a drop ceiling could be a plenum, and if such, the
> cabling that resides up there is much more expensive.
>
> Wikipedia provided an explanation of what a plenum is, but my question
> is is there a test to know if the airspace up there is a plenum?  I
> believe that it is a somewhat sealed airspace, but the drop ceiling is
> old and not really sealed.  Should I just call the fire inspector and
> ask him?  Anyone else have this situation?  We do have non-plenum
> cable up there right now, but my concern is that my predecessor didn't
> know about the law either and we might have to recable the whole
> office.
>
> Also, on a related note should I look at getting cat6 vs cat5e?
>
> Share and Enjoy
> Ben
>
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