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Joined: Oct 2009
Posts: 1
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Joined: Oct 2009
Posts: 1 |
Pardon my ignorance as an alarm tech. Phone vendor gave us permission to use some conductors of a 25 pair run. Why am I reading about 30 ohms resistance even when the pair is shorted on 1 end? I've tried it with more than 1 pair. We can't really use the wire with that much resistance. Thanks
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Joined: May 2002
Posts: 17,747 Likes: 38
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Joined: May 2002
Posts: 17,747 Likes: 38 |
You don't say how long this cable is, but if you're seeing 30 ohms on a short the actual resistance is 15 ohms on the pair. That would be about 300 feet of 24 gauge cable. Your alarm system should handle that just fine.
Retired phone dude
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Joined: Jan 2007
Posts: 153
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Joined: Jan 2007
Posts: 153 |
Technician I IBEW Local #58 Detroit, MI
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Joined: Nov 2008
Posts: 953
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Joined: Nov 2008
Posts: 953 |
I agree with Kevin-MI.
Run your own Wire and You Solved your Problem.
"The Only Stupid Question, Is the Question Thats not Asked."
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Joined: Dec 2004
Posts: 5,722
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Joined: Dec 2004
Posts: 5,722 |
Yes, running your own wire keeps the data "noise" out of telephone cable and visa versa.
Less chance of errors happening and you having problems and telco having problems.
Good Luck.
Ken
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Joined: May 2002
Posts: 4,314 Likes: 8
Moderator-Avaya, Polycom
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Moderator-Avaya, Polycom
Joined: May 2002
Posts: 4,314 Likes: 8 |
Always run your own wire and you have control
Over your circuits.
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Joined: Dec 2007
Posts: 6,839 Likes: 27
Retired Admin
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Retired Admin
Joined: Dec 2007
Posts: 6,839 Likes: 27 |
The only reason I can think of why you would even begin to use a cable that is out of your control would be to extend dial tone on riser cable. Then again, I run my own RED cable.
Other than that, Fire Wire is RED for a reason. It let's all other trades know that the wiring is for life safety. You spray paint J-Box Covers, Hangers, Flex...et cetera RED for a reason. Why come to think if it...even the FACP's are also RED.
When someone is demolishing an area for a rebuilt you can be rest assured that most craftsman won't touch RED wire. They should know that in an active area that it could still be active.
AHJ in most, if not all, areas require Life Safety to have it's own seperate path.
The minute you intrude into another trade you open youself and your customer to multiple problems.
ALSO: What is the gauge of your Fire Wire as compared to the CAT 3 25 pr?
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