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  • thr0w4w4y2@sh.itjust.workstohomeassistant@lemmy.worldHome Wiring
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    4 months ago

    I’m using PoE Extractors to run some regular 12vdc stuff using existing ethernet cabling.

    A couple of points to note:

    • network switches won’t turn on power by default unless the receiving device asks for it using the right protocols, so you need to inject the power using the corresponding PoE injector at the other end of the cable. you can’t just snip the end off a RJ45 and wire it into things.
    • Cat cable won’t take high currents, be sure to stick within the allowed range for the cable or it will melt and maybe bust your device
    • there is a voltage drop over distance, be sure to calculate if you need to change your transformer as 12vdc could become 9 or lower by the time it gets to your device
    • there are some really poor quality PoE injectors/extractors.
    • running mains cable and having a transformer nearer the device might be simpler and cheaper in the long run.