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#1
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Phone Lines and Electrical Wiring
On residential new construction, how close can a interior phone line be to
electrical wiring without being affected by electromagnetics? Can they cross each other? |
#2
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Phone Lines and Electrical Wiring
The "book" on phone wiring says you can run them perpendicular but not
parallel to each other. I've run them parallel in the same drilled holes in studs for short distances with no problems "JWJWJ" wrote in message news:92d41fc0e2af8a99ee1153d2da99e2f9@homerepairli ve.com... On residential new construction, how close can a interior phone line be to electrical wiring without being affected by electromagnetics? Can they cross each other? |
#3
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Phone Lines and Electrical Wiring
Others will tell you different, but I have ran phone, cat5e and Romex all
together. In fact, when I wired my garage, the phone cable (I used cat5e cable) was ziptied to the main run of Romex cables for the whole garage. No problems with it at all. My phone cable is brought to my house hanging underneath the main lines, and people want you to believe that a 120V cable is going to cause a interference problem. nada! "JWJWJ" wrote in message news:92d41fc0e2af8a99ee1153d2da99e2f9@homerepairli ve.com... On residential new construction, how close can a interior phone line be to electrical wiring without being affected by electromagnetics? Can they cross each other? |
#4
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Phone Lines and Electrical Wiring
"J.A. Michel" wrote:
Others will tell you different, but I have ran phone, cat5e and Romex all together. In fact, when I wired my garage, the phone cable (I used cat5e cable) was ziptied to the main run of Romex cables for the whole garage. No problems with it at all. My phone cable is brought to my house hanging underneath the main lines, and people want you to believe that a 120V cable is going to cause a interference problem. nada! It would if you were using the old four wire, non twisted cat 0 phone wire. Since you are using cat 5 wire which is twisted pair the twist cancels out the common mode interference that would most certainly have been picked up with the old untwisted wire. As for the drop to the house which is likely non twisted drop cable, it is not in close enough proximity to be a problem. The magnetic field that induces interference drops off in strength rapidly with distance. Pete C. |
#5
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Phone Lines and Electrical Wiring
I realize the original post was about phone wire, but I'd be interested
to see a data analyzer hooked up to some cat 5 data cables that were run next to electrical wires. I'd be curious as to how many dropped packets and retransmissions due to errors would occur. The average user might not ever notice a problem but errors like these increase network traffic and would drive a network engineer up a wall. Pete C. wrote: "J.A. Michel" wrote: Others will tell you different, but I have ran phone, cat5e and Romex all together. In fact, when I wired my garage, the phone cable (I used cat5e cable) was ziptied to the main run of Romex cables for the whole garage. No problems with it at all. My phone cable is brought to my house hanging underneath the main lines, and people want you to believe that a 120V cable is going to cause a interference problem. nada! It would if you were using the old four wire, non twisted cat 0 phone wire. Since you are using cat 5 wire which is twisted pair the twist cancels out the common mode interference that would most certainly have been picked up with the old untwisted wire. As for the drop to the house which is likely non twisted drop cable, it is not in close enough proximity to be a problem. The magnetic field that induces interference drops off in strength rapidly with distance. Pete C. |
#6
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Phone Lines and Electrical Wiring
In article . com,
"DerbyDad03" wrote: I realize the original post was about phone wire, but I'd be interested to see a data analyzer hooked up to some cat 5 data cables that were run next to electrical wires. I'd be curious as to how many dropped packets and retransmissions due to errors would occur. The average user might not ever notice a problem but errors like these increase network traffic and would drive a network engineer up a wall. Agreed, but I think your concern is EXACTLY WHY Cat5e was developed. I suspect that, except in isolated cases, electromagnetic interference with Cat5e is virtually non-existent. I'd bet that you'd find more drops and retries due to poor connections such as at routers, patch panels, and improperly made/crimped RJ45 ends, to name a few likely spots. Just a thought... -- JR Where are ya, Ma, when we really need ya? |
#7
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Phone Lines and Electrical Wiring
In article om,
JWJWJ wrote: On residential new construction, how close can a interior phone line be to electrical wiring without being affected by electromagnetics? Can they cross each other? Thye can be right next to each other abd touching without any electrical interference, but it won't meet code on safety. -- Make it as simple as possible, but no simpler. Larry Wasserman - Baltimore Maryland - |
#8
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Phone Lines and Electrical Wiring
In article , on Fri, 24 Nov
2006 23:32:51 -0600, wrote: In article om, JWJWJ wrote: On residential new construction, how close can a interior phone line be to electrical wiring without being affected by electromagnetics? Can they cross each other? Thye can be right next to each other abd touching without any electrical interference, but it won't meet code on safety. Not sure about the interference, but you're right about not meeting code. The NEC, in Sec. 800.133, specifies a 2 inch separation between "communication cables" and power cables unless the cables are somehow physically separated, such as by a conduit. -- Seth Goodman |
#9
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Phone Lines and Electrical Wiring
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