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I always use a shielded twisted pair cable for any audio feeds. Depending on the distance, 22 to 16 gauge...never had to use anything larger.


Jeff Moss

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You want to use a balanced line with a line level signal. You should be OK with using a pair on your 25 pair but if it were me and since this is a new pull I would use a separate shielded twisted pair as Jeff suggests. Keep in mind that this is an UG run and anything you pull has to be suitable for direct burial. They do make flooded audio cable, I believe West Penn is one manufacturer.

-Hal


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Hal is right...take a look at their Aquaseal series of cables.


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Back in the '60s I worked for a Paging and Intercom company. They had their own "Muzak" - banks of tape decks that sent out signal over telephone company leased lines. These worked fine all over the city.

We would routinely do jobs for Garment Center companies - A showroom on 7th Avenue or Broadway and a factory on the far West side or across the river in NJ. Each side would have it's own amplifier, speakers and Intercom system (this predated Interconnect).

We would connect the two sites with leased lines and they could page the other side and then talk to each other. We routinely did this over many miles of Telco copper wire.

One morning we came in to dozens of trouble tickets. None of our remote paging to/from NJ was working! Over the weekend, NY Tel had converted all the cross-Hudson circuits from copper to Carrier. Woops!

But everything worked fine over long distances of copper OSP.


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Quote
Originally posted by hbiss:
Keep in mind that this is an UG run and anything you pull has to be suitable for direct burial. They do make flooded audio cable, I believe West Penn is one manufacturer.-Hal
The plan was to have them install a 4' PVC pipe from building to building with 3-4 Quasite boxes along the way.

Pull a fiber interduct, a 50-pair PVC Cat3 (never passes through plenums, even inside the building), a shielded audio cable now, and a heavy pull tape for future.

Then have FIS make me up a custom MM distribution 6-cond 62.5 fiber with a pull eye, all pre-terminated, to pull through the interduct.

Never even considered direct burial cable to be honest. It would be a 'one time' deal. Maybe a 50pair and the fiber as direct burial would be worth looking at as an option. Then there would be no Quasite boxes, not as much worry about avoiding running the cable only where large trucks would drive over it etc.

Since their security cameras run over IP, the fiber takes care of that - will consider a one time direct burial. :bow:

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Maybe 15 years ago I had a customer that owned a restaurant that got it's music from an "audio pair". It was in the NI on the outside of the building along with his regular POTS and payphone lines and was wired with old quad just like all the rest. When I first clipped my buttset onto it I thought it was a non-working pair that was picking up a radio station. I figured it out when it dawned on me that the music inside sounded like what I had heard. Of course nobody told me, the old Greek who owned the place probably had no idea.

-Hal


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Never even considered direct burial cable to be honest.

I'm saying that what you put in the conduit must be direct burial cable.

Everything installed below grade, even in conduit and innerduct HAS to be suitable for direct burial. That conduit and innerduct will fill with water no matter how you think it won't. It's a common misconception by greenhorns to think they can install UG conduit and just pull "indoor" cable and it will last. Ain't gonna happen.

-Hal


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Hal, let me ask you this...At my house in Toledo, we just had an electrician trench our backyard and run conduit to our garage and put in a 60 amp subpanel. He just ran normal #10 THHN stranded wire through the conduit. Is this going to cause a problem with the weather here?


Jeff Moss

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Oh damn you know how to ruin a party! Isn't direct burial cable stiff as a board? Pulling through a conduit - no fun. Some of those direct burial cables look like they could survive a nuclear holocaust - rat repellent, armor, ant destroying nanoprobes smile . If I could skip the conduit it would make the job a lot easier.

I completely agree with the no 'inside-grade' cable through the conduit - that is a done deal. However, it there is a brutally tough (price is no object) 6-cond fiber and 50-pair that we could feel comfortable about laying in the dirt 24" down, that would really make our day.

BTW, if any of you travel through PDX, beers on me.

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Jeff, the wire is dual rated (TNNH/THWN) which is fully-suited for wet locations. They really don't make THHN and THWN as separate wire types anymore.


Ed Vaughn, MBSWWYPBX
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