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Old 07-01-2012, 12:21 PM   #16
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Phone wires with line voltage


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Originally Posted by Hexamexapex View Post
So the key here would be to not run the low voltage parallel to ac line over long runs. It also appears that the twisted wires really prevent excess noise. This makes me wonder how induced current can be prevented by twisting wires like the cat5. Might need to study up on electromagnetic fields.
Look up common mode rejection while your at it....

You can get common mode voltage induced on the twisted pair....but because of the twist in the wires, it's not unduced as a current into the wires. You will find that most Ethernet ports are transformer coupled which helps elminate any common mode voltage applied to the eletronics.

As others said above...no real issues running the Cat5(6) parallel to AC wiring....done all the time.....but there has been a few instances of people driving nails where they should not (no nail block) and shorting low voltage to high voltage.....

Just like some pleople have driven in a ground rod....right through the conduit that feeds the garage.....while their son was holding the ground rod while their dad was on the ladder banging it in....good thing it hit the ground wire first before hitting the hot....otherwise said son would have known real quick.....AMHIKTS

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Old 07-01-2012, 12:37 PM   #17
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Phone wires with line voltage


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Originally Posted by ddawg16 View Post
Look up common mode rejection while your at it....

You can get common mode voltage induced on the twisted pair....but because of the twist in the wires, it's not unduced as a current into the wires. You will find that most Ethernet ports are transformer coupled which helps elminate any common mode voltage applied to the eletronics.

As others said above...no real issues running the Cat5(6) parallel to AC wiring....done all the time.....but there has been a few instances of people driving nails where they should not (no nail block) and shorting low voltage to high voltage.....

Just like some pleople have driven in a ground rod....right through the conduit that feeds the garage.....while their son was holding the ground rod while their dad was on the ladder banging it in....good thing it hit the ground wire first before hitting the hot....otherwise said son would have known real quick.....AMHIKTS
I am checking out common mode rejection now. I thought there was code against running the lower rated insulation phone wires with line voltage insulation but I guess not. By the way thanks for the educated insight everyone. This is good stuff!
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Old 07-01-2012, 01:33 PM   #18
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Phone wires with line voltage


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I thought there was code against running the lower rated insulation phone wires with line voltage insulation...
I think that is when you are running both through a conduit, the insulation rating has to be the same (usually most romex is rated for 600 volts I believe). I don't think it matters when running both through bored holes in a joist/stud wall.
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Old 07-01-2012, 01:44 PM   #19
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Phone wires with line voltage


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I think that is when you are running both through a conduit, the insulation rating has to be the same (usually most romex is rated for 600 volts I believe). I don't think it matters when running both through bored holes in a joist/stud wall.
Great.......now I can stop drilling those extra holes for phone and cable! Within reason of course....
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Old 07-01-2012, 01:49 PM   #20
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Phone wires with line voltage


Usually I think the recommended method is to keep the low voltage/line voltage cables separated by at least 1 ft when run parallel for a great distance.
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Old 07-01-2012, 01:56 PM   #21
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Phone wires with line voltage


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Usually I think the recommended method is to keep the low voltage/line voltage cables separated by at least 1 ft when run parallel for a great distance.
Even though the twisted makeup of the wires should prevent any interference it is best to play it safe and keep them a safe distance apart for runs of long distance.

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