Business Phone Systems

Previous Thread
Next Thread
Print Thread
Rate Thread
#597950 02/13/16 02:24 AM
Joined: Aug 2002
Posts: 1,024
Likes: 1
jsaad Offline OP
Member
OP Offline
Member
Joined: Aug 2002
Posts: 1,024
Likes: 1
We have the opportunity to do a telephone paging system in a large warehouse (100,000 sq ft). Typically our projects are small.

We're running 18/2 shielded cable, our longest run is 600 ft from the amplifier. We're using Bogen SPT15 horns and a Bogen TPU250.

Should we ground the shield at the amplifier in the telephone room?

How do you recommend to terminate the cables at the amplifier?
I have 8 total runs, I can punch them to a 66 block but I'm curious if there is a better way.




Atcom VoIP Demo
VoIP Demo
Joined: Jan 2013
Posts: 519
Likes: 1
Member
Offline
Member
Joined: Jan 2013
Posts: 519
Likes: 1
Originally Posted by jsaad
We have the opportunity to do a telephone paging system in a large warehouse (100,000 sq ft). Typically our projects are small.

We're running 18/2 shielded cable, our longest run is 600 ft from the amplifier. We're using Bogen SPT15 horns and a Bogen TPU250.

Should we ground the shield at the amplifier in the telephone room?

How do you recommend to terminate the cables at the amplifier?
I have 8 total runs, I can punch them to a 66 block but I'm curious if there is a better way.

Is this going to be a 70V system? Bogen has a great System Design Guide that will answer the majority of your questions.


Patrick T. Caezza
Santa Paula, CA 93060
C-7 - Low Voltage System Contractor - Lic# 992448
Joined: Jul 2006
Posts: 2,670
Likes: 9
Admin
***
Offline
Admin
***
Joined: Jul 2006
Posts: 2,670
Likes: 9
Originally Posted by jsaad
We have the opportunity to do a telephone paging system in a large warehouse (100,000 sq ft). Typically our projects are small.

We're running 18/2 shielded cable, our longest run is 600 ft from the amplifier. We're using Bogen SPT15 horns and a Bogen TPU250.

Should we ground the shield at the amplifier in the telephone room?

How do you recommend to terminate the cables at the amplifier?
I have 8 total runs, I can punch them to a 66 block but I'm curious if there is a better way.

How do you propose to punch 18-2 stranded wire on a 66 block? send pics :-)

Wire nuts are your friend, or if you need fancy https://electronics.mcmelectronics....ist&w=barrier+strips&x=0&y=0


Carl

Last edited by Carl Navarro; 02/13/16 06:15 AM.
Joined: May 2007
Posts: 5,049
Likes: 3
Moderator-1A2, Cabling
*****
Offline
Moderator-1A2, Cabling
*****
Joined: May 2007
Posts: 5,049
Likes: 3
You should terminate stranded wire on a barrier strip or similar device. NEVER punch down stranded wire.

Unless an engineer has determined that you need it, you should NEVER run shielded wire for speakers.

Sam


"Where are we going and why are we in this hand basket?"
Joined: Jan 2010
Posts: 189
Member
Offline
Member
Joined: Jan 2010
Posts: 189
I'll second Sam and Carl, you should not have pulled shielded cable for the speakers. In this case, the only harm it will do is hurt your bottom line since you paid more money for cable you didn't need. A regular unshielded 18/2 cable would be just fine.

Do not ground the shield on EITHER end. And make sure the drain wire and foil is cut back and insulated on both ends.

And you will have a hell of a time punching 18/2 down to a 66-block. Use a screw terminal barrier strip or wire nuts instead.

Last edited by tim10; 02/13/16 02:15 PM.
Joined: May 2007
Posts: 5,049
Likes: 3
Moderator-1A2, Cabling
*****
Offline
Moderator-1A2, Cabling
*****
Joined: May 2007
Posts: 5,049
Likes: 3
The thing with shielded wire is that the shield can act as an antenna and actually ATTRACT unwanted signals, rather than keep them out.

The rule of thumb (as I learned it) is: Unless specified by the manufacturer, ground the shield end at the equipment side and safe it off at the device side.

Sam


"Where are we going and why are we in this hand basket?"
Joined: Aug 2002
Posts: 1,024
Likes: 1
jsaad Offline OP
Member
OP Offline
Member
Joined: Aug 2002
Posts: 1,024
Likes: 1
great advice, thanks!

Joined: Feb 2005
Posts: 12,334
Likes: 3
Member
***
Offline
Member
***
Joined: Feb 2005
Posts: 12,334
Likes: 3
I'll third the advice to not use shielded cable. If you haven't run it yet DON'T. It can only cause trouble and in addition to what Sam said can actually cause amplifier stability problems with 70.7 volt systems.

And yes, wire nuts.

-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.

Moderated by  metelcom 

Link Copied to Clipboard
Forum Statistics
Forums84
Topics93,827
Posts636,768
Members49,645
Most Online5,661
May 23rd, 2018
Popular Topics(Views)
Today's Birthdays
Dan Powell, EKPTECH86, History, LinuxTech, Mike Miller, ttcfcl
Newest Members
KoolBreeze, PhoneGuy827, julesm, Helen.D, AlAl
49,644 Registered Users
Top Posters(30 Days)
ramo 12
pvj 11
Toner 9
Who's Online Now
0 members (), 23 guests, and 24 robots.
Key: Admin, Global Mod, Mod
Contact Us | Sponsored by Atcom: Business Phone Systems | Terms of Service

Sundance Communications is not affiliated with any of the above manufacturers.
©Copyright Sundance Communications 1998-2023
Powered by UBB.threads™ PHP Forum Software 7.7.5