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Path: utzoo!utgpu!water!watmath!clyde!rutgers!ames!amdahl!bnrmtv!mclean
From: mclean@bnrmtv.UUCP
Newsgroups: comp.dcom.lans
Subject: Re: Cheapernet Help Needed
Message-ID: <1953@bnrmtv.UUCP>
Date: Fri, 5-Jun-87 16:10:45 EDT
Article-I.D.: bnrmtv.1953
Posted: Fri Jun  5 16:10:45 1987
Date-Received: Sun, 7-Jun-87 04:58:35 EDT
References: <234@srs.UUCP>
Organization: Bell Northern Research, Mtn. View, CA
Lines: 18
Summary: Closed Plenum

In article <234@srs.UUCP>, lee@srs.UUCP (Lee Hasiuk) writes:
> We are moving to a new building, where we are required to use 'Plenum' type
> cable for all runs which go through the suspended ceiling and not in metal 
> conduit.

As I recall, there are two alternatives (depending on your local codes):

    1)  Use an open plenum return for heating and cooling but require
	such wiring to be in conduit.

    2)  Use a closed duct return for heating and cooling which allows
	open wiring of some cables, particularly twisted pair and coax.

Heavy communications environments are typically cheaper to run closed
air ducts than wire conduit.

Rick McLean
{amdahl | hplabs}!bnrmtv!mclean