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Thread: electrical and coax in the same run?

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    Chadwick is offline Newbie
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    electrical and coax in the same run?

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    Is it OK to run electrical wire on top of coaxial cable for TV through the studs or will it create noise in the equipment plugged into the circuit it's next to?

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    c7sus is offline Disenfranchised Member
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    You want any audio or video kept away from line sources when running parallel.

    4 inches would give you plenty of seperation.

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    Re: electrical and coax in the same run?

    Originally posted by Chadwick
    Is it OK to run electrical wire on top of coaxial cable for TV through the studs or will it create noise in the equipment plugged into the circuit it's next to?
    Bad idea. It can induce interference on the coax. I'd keep it more like a foot away if you have to run parrallel and if you have to cross is, do it at 90 degree angles.

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    Chadwick is offline Newbie
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    OK. Good thing I asked. I started to run them together and it just seemed wrong. Thanks!

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    knightfly is offline GrouchyOldFartOnBatteries
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    Another thing to watch for - if possible, don't cut electrical boxes into the wall - surface mounting gives better sound proofing. If you have to flush-mount, don't mount boxes back-to-back but offset them by at least 2 feet or one stud cavity. Smear the entire box outside with caulk so it's airtight. Sound can leak through incredibly small cracks and holes... Steve
    Hey, I thought this was gonna be EASY!??!

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    Just to be safe, dont run them in the same house.

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    c7sus is offline Disenfranchised Member
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    In automated motor-control settings that utilize "Data Highway" coax technology the recommended seperation is 2" minimum from 120v CONTROL sources. Granted, these circuits carry either no current, or 4-20mA depending on their function.

    In seperate conduits these different systems can be run parallel over very long distances with no negative impact on data transmission.

    The rule-of-thumb as far as how big the magnetic field around a conductor is is about 1 inch diameter for every 10,000 volts.

    That is to say that 10,000 volts will jump across a 1-inch gap.

    And 20KV will jump 2 inches.

    And so on.

    So there is no need to put coax a foot away from 120v line power, even on parallel runs.

    Hell, try it out.

    Put a 50' extension cord on your reefer.
    Tape 50' of coax to the extension cord.

    When your reefer kicks in you'll see what a good spike does.

    Now seperate them. Tape them 2 inches apart, parallel.

    I doubt you would find any detectible loss or degradation in the second scenario.

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    Track Rat's Avatar
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    What happens is can induce a 60 or 120 cycle hum modulation taht mixes with the RF and manifests itself as either a single bar ot two bars rolling slowly upwards through the screen. A foot may seem like over kill but if you have to drill new holes anyway, what the hell.

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