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Joined: Jun 2004
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This is very interesting; almost seems looney. almost makes the "my IT guy says if we don't have RJ45 plugs in the data switch the Data will spill out on the floor" type of looney.
Even though the lube is conductive, one would think that the cable jacket would insulte against any interference brought on by the lube.
Isn't there a nonconductive lube electricians use for pulling into a panel box? I wonder how that affects the test.
I also noticed that temperature has a measurable influence. Kinda makes me second guess the attic installs I did that ran through long lengths of counduit that easily passed the 60 C mark in the middle of summer and required copious amounts of lube.
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Joined: Feb 2005
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Even though the lube is conductive, one would think that the cable jacket would insulate against any interference brought on by the lube. Well, it's not interference it's capacitive coupling between the conductors and the conductive lubricant coating the outside of the cable. It's much like a unconnected floating shield on a shielded cable. I also wonder what the effects are of running the cable in small diameter metal conduit or raceway and also of bundling with other cables. Like I said, we're at the lunatic fringe of what UTP Cable is capable of but the greedy cable manufacturers won't throw in the towel. -Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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If the metal conduit or raceway is grounded properly that should take care of outside interference. As far as the cables in the conduit or raceway are concerned I think it depends on what they are carrying, narrow, wide or broadband signals. In the case of broad or wide band the shields should be grounded. If I knew or suspected or wanted to be sure I'd run STP in the conduit.
Forty six years and still fascinated with Telecommunications!
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When I was in PBX our practice with any cable from 1 pair up to whatever pair was to uncoil the spool or coil of wire and lay it flat on the floor. We would never pull cable directly into a duct, conduit or raceway off a coil or spool because the wire would form a coil,sometimes called "snaking" matching the shape it was when on the coil or spool. We also followed this practice so as not to have multiple cables coiled inside the same conduits.
Last edited by John Osvatic; 10/27/12 01:19 PM.
Forty six years and still fascinated with Telecommunications!
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If the metal conduit or raceway is grounded properly that should take care of outside interference. As far as the cables in the conduit or raceway are concerned I think it depends on what they are carrying, narrow, wide or broadband signals. In the case of broad or wide band the shields should be grounded. If I knew or suspected or wanted to be sure I'd run STP in the conduit. We're not talking about interference. As far as "what they are carrying" they would be tested to whatever the specs are for the category of the cable. So it doesn't matter what they are carrying, if you have to certify the installation (cable and terminations) must meet the minumum specs and apparently outside influences will adversely effect them. Oh, you would be a better man than me to use STP CAT6 or CAT7 (is it even available?). -Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Friction reduciton in EMT? Try corn starch for the lube. Heat drys out the liquid lubes....corn starch are very small balls.
Ken
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RIP Moderator-Mitel, Panasonic
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"Friction reduciton in EMT? Try corn starch for the lube. Heat drys out the liquid lubes....corn starch are very small balls."
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Hmmm, reminds me of a joke about Moth Balls
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
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