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From: David Lesher <wb8foz@panix.com>
Newsgroups: sci.electronics.design
Subject: Re: CAT5e cable
Date: Wed, 7 May 2025 23:06:50 -0000 (UTC)
Organization: NRK Clinic for habitual NetNews Abusers - Beltway Annex
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Jeff Liebermann <jeffl@cruzio.com> writes:


>>I've been just picking up whatever (riser) cable is conveniently available,
>>in the usual 1000 ft boxes.  No real focus on manufacturer, etc.

>What type of outer jacket did you buy?  CL, CM, CMG, CMR, CMP, CMX,
>CMX2, CMX3, etc?

>Are you dealing with any kind of fire or smoke related requirements?
>Some jackets trade slow burning, so that a fire doesn't spread as
>quickly, for generating toxic smoke.  

Last I heard, the EU forbid our plenum cable as when the fireproof
Teflon plenum cable is charred, the gas is quite toxic.

>"Understanding Cable Jacket Ratings: CL, CM, CMR and CMP"
><https://www.cmple.com/learn/understanding-cable-jacket-ratings-cl-cm-cmr-and-cmp>


>>But, had to run some drops in EMT recently and noticed a marked difference
>>it the overall durability of the different cables that were being fed.

Worse, I saw some cable from One well-known discount vendor. 
The insulation on the conductors was so thin and poorly applied
that there were ~~cm long bare sections within the jacket. The
problem was, two were bare in an adjacent location. What was
the last time you looked for a short IN the middle of newly
installed cable vs. at the end connectors????

>Outdoor cable usually mean UV resistant. It can also be direct burial
>cable where the space between the wires and outer jacket are filled
>with silicon slime.  It does a good job of keeping the water out of
>the cable, but does make a mess.  

Beware using filled cable indoors. That gel may well be flammable.
There's something in the Code re: that.


>Lots of interpretations for "outdoor cable".
I live where there is lightning; to me "between buildings" means
fiber, period.

>>Any tips on what to look for in a *description* to select for the "nicer"?
>>cable?  (I could probably look at the markings on the jackets to identify
>>the different brands)

>"Ethernet Cable Identification for Beginners: Reading Print Legends"
><https://www.truecable.com/blogs/cable-academy/ethernet-cable-id-for-beginners#>

>Incidentally, watch out for CCA Ethernet cable.  CCA means copper clad
>aluminum.  CCA is cheaper than 100% copper, but everything else about
>it is horrible:

It's good for the doorbell and tying up the dog.

-- 
A host is a host from coast to coast...............wb8foz@panix.com
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