"RicodJour" wrote in message
...
On Sep 29, 5:30 pm, wrote:
On Thu, 29 Sep 2011 15:19:42 -0400, "Percival P. Cassidy"

wrote:
I am running network cables -- shielded, if that makes a
difference --
above suspended ceiling where there is already 120V Romex wiring in
places. This 120V wiring is stapled to the joists at intervals.

Is it OK for the network cables to lie on the ceiling support
members,
and thus beneath the Romex? Or should the network cables be above
the
Romex? Or should one or both be in conduit? -- more precisely,
should
what is now Romex be redone with individual conductors in conduit?


no issue even with cat5 or cat5e non sheilded - as long as your
space
above the ceiling is not an air plenum - and then you just need
plenum
rated cat5

[What's the reasoning behind plenum rating a computer cable? Is there
some fire-reasoning behind it or what? What's the difference between
rated and non-rated cable?]

Some wire (non plenum rated), when it burns in a fire, will put off
toxic smoke. You wouldn't want toxic smoke to be sent through all the
air ducts!