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Toot

Written by Emelia/Emi on 2024-04-25 at 16:42

So I just had a stupid idea. The NEC doesn't allow you to run low-voltage in the same conduit as high-voltage, right? Aside from one very specific situation: the entire low-voltage system is rated to withstand the highest voltage in the pipe (which includes being wired accordingly). That's how split-unit heat pumps can put their low voltage signals next to power: both ends are in "class 1" (high voltage) boxes, and the electronics are rated for it.

Well, what about ethernet? cat5e is generally insulated to 300v, which is fine, and the isolation transformers are rated for 1500v common-mode (if not using PoE) which is also fine. The problem? the connectors. They're generally in open-air and accessible to grabby meat-mittens. The solution comes in the form of PoE injectors: there's nothing saying that ethernet can't have more than two isolation transformers, which is how PoE injectors avoid back-feeding the device 'behind' them. 1/?

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Descendants

Written by Andrew Zonenberg on 2024-04-25 at 16:49

@becomethewaifu "grabby meat mittens" is such a great term.

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