[TriLUG] OT: how do I know if ethernet cable is plenum rated?

[Steve Holton]

On Tue, May 27, 2008 at 9:27 AM, Heath Roberts <htroberts at gmail.com> wrote:
> "riser" cable is more fire-resistant than "plenum" cable.

Agree.

> You can use plenum
> cable in a riser, but not riser cable in a plenum.

You meant the reverse. You can use riser cable in a plenum, but you
can't use plain-old plenum cable in a riser.  But we know what you
meant.

> The "plenum" is a structural space where mechanical systems move air. So a
> raised floor in a computer room is a "plenum" if you've got air handlers
> pushing air into it. This isfairly common in computer rooms, but not all
> raised floors are used as plenums. The space above a suspended ceiling is a
> plenum if it's used to return air to the HVAC system, but it's not a plenum
> if the return (as well as supply) air is contained in ductwork.

Very well put. Both supply and return must be in ductwork, otherwise
it is environmental airspace (and needs listed cables).

-- 
Steve Holton
sph0lt0n at gmail.com