Path: utzoo!attcan!uunet!cbmvax!grr
From: grr@cbmvax.UUCP (George Robbins)
Newsgroups: comp.dcom.lans
Subject: Re: Ethernet electrical interference?
Keywords: near high voltage cables
Message-ID: <4766@cbmvax.UUCP>
Date: 18 Sep 88 23:09:37 GMT
References: <183@pai.UUCP>
Reply-To: grr@cbmvax.UUCP (George Robbins)
Distribution: na
Organization: Commodore Technology, West Chester, PA
Lines: 26

In article <183@pai.UUCP> pfh@pai.UUCP (Peter Hill) writes:
> 
> We use Ethernet (actually 802.3) to connect PCs and Unix workstations
> in factory environments.  We tell our customers to run the Ethernet
> trunk cable in conduit away from high-voltage power cables or large
> motors.
> 
> Now we have a requirement to wire several floors of a building.  We
> have no options for running the trunk cable between floors:  it will be
> in conduit, near other conduit carrying 480VAC power cables.  This will
> be a long vertical run, parallel to the power cables.  We can't get
> much separation, certainly less than a foot, perhaps only a few inches.

As long as the power cables are in conduit you will probably be ok,
especially if you are also in your own metallic conduit.  Also pay
attention to grounding your backbone cable shield in one and only
one place.

In the unlikely event that you have problems, there are various
flavors of fiber optic repeaters and bridges that are theoretically
immune to such difficulties..

-- 
George Robbins - now working for,	uucp: {uunet|ihnp4|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@uunet.uu.net
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)