DSL & Large Motor

[hbiss]

Re: DSL & Large Motor

But around here all UTP that comes in from the street is shielded and bonded at both ends. I have seen it smoke on a lost secondary neutral, and I could imagine the noise a bad primary MGN would cause on it.

Well, it's not UTP (unshielded twisted pair) if it has a shield, is it?

It's either shielded OSP cable or drop cable. Usually shielded drop cable will be only be used underground (it's not just a shield but armor). They do bond the shield on drop cables at both ends however OSP multi-pair should only be bonded on the street side. In the building it can only go as far as bonding a metallic splice case containing the splices that connect the OSP cable to a terminal stub. Reason being the problem that you mention. The terminal and protectors would of course be bonded to the building ground.

Many telco linemen don't know this. I have actually had to tell them that this is their practice.

-Hal

[ November 20, 2005, 05:26 PM: Message edited by: hbiss ]

 

[hurk27]

Re: DSL & Large Motor

By Hal: Well, it's not UTP (unshielded twisted pair) if it has a shield, is it?

Oh DOA

Ok retract and resubmit: Around here they use (FTP) and sometimes S/FTP

There, better?


Cable types
Shielded Twisted Pair (STP)
Screened Shielded Twisted Pair (S/STP)
Unshielded Twisted Pair (UTP)
Foiled Twisted Pair (FTP)
Screened Unshielded Twisted Pair (S/UTP)
Screened Foiled Twisted Pair (S/FTP)

So we all can have the same terminology


[ November 21, 2005, 02:07 AM: Message edited by: hurk27 ]

 

[hbiss]

Re: DSL & Large Motor

I doubt you will find any telco running data type cable. More likely one of these:

http://www.cliffordvt.com/outsidetelecable_text.html


-Hal

 

[jlund]

Re: DSL & Large Motor

well the problem turned out to be More the Latter, (busbar)I saw the was a small voltage differance(less then a volt) between the grounding lug on the Demark and the ground of the Metal Conduit runing right next to demark, so I left the ground from the Bus Bar in place and added a short hunk of 12 AWG between the qwest Demark ground lug and attached the other end to the conduit Via a grounding Lug and it worked the DSL stayed on-line with the Motor on, which would explain why when I removed the ground lug all together the DSL stayed On-line as well,

 

[jlmiller]

Re: DSL & Large Motor

I had a very similar problem with my dsl box at my office. I only have single phase service, but being at "ground zero" of hurricane katrina my office was among the first to get commercial power restored (pure luck). I plugged in a camper trailer to a 120vac branch circuit that happened to be on the same hot leg as the circuit feeding my dsl box. Everytime the compressor kicked on at the trailer, my dsl would blink...(even with a ups) (took me 2 weeks just to figure that part out) Turns out, that my 2 hots inside the panel were way out of balance, and while I didn't see a large voltage drop, I reworked my panel to balance the load as best I could. Surprisingly, it solved the problem.....

With 480v perhaps you should look at this....

Hope this helps....