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There is a similar question where someone is building a new house and is planning to hardwire network cables into each room.

Can somebody run CAT5/6 cables parallel to low voltage (5v, 9v, 12v, 15v) wires without introducing any general safety issues or losing much in connection quality?

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  • You can run that sort of voltage inside an ethernet cable so it should indeed be quite safe. I'm not sure how much electrical noise low voltage cabling can generate though, so I can't answer the connection quality part of your question. Using a shielded & grounded cables would help, but it might be overkill.
    – CactusCake
    Commented Oct 12, 2017 at 17:50
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    Almost a duplicate. As noted there, Cat5e/6/6A cable (and the protocols that use them) are highly resistant to interference by design. Note that cable salesfolk try to upsell stuff that's not needed/useful despite that. diy.stackexchange.com/questions/92827/…
    – Ecnerwal
    Commented Oct 12, 2017 at 18:03
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    Can you elaborate on what you're trying to do? This sounds like an XY problem
    – Machavity
    Commented Oct 12, 2017 at 18:32

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What bothers electronic signals is oscillating magnetic fields. DC power cables create an unchanging magnetic field like a refrigerator magnet.

However, if you are hauling 5 volts DC across a house, that's probably a mistake unless you are using huge wire. Voltage drop will kill you...

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