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I never knew that USB-C extensions are not allowed for a reason
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this post was submitted on 26 Dec 2024
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Anybody care to sum this up for people who can’t watch videos?
So a standard cable needs to be chipped to show its rating to the device, its not that the device can pull what it wants or can get, but the cable itself tells it what it can supply. Extension cables can’t do that, because it doesn’t know what it’s plugged into, and that would be if they even bothered to put a chip in. They instead piggy back off the chip for the main cable. The problem comes when you you have a 240 watt cable hooked up to a cheap 120 watt cable, with the device being told it can push 240, and starts to super heat the extension cable
How did we possibly survive with entirely dumb power chords?
Safety regulations are written in blood. Electrical fires were indeed a problem. It's why there are rules on how many outlets need to be in a room, how spaced out they need to be (to curtail extension cord usage even when the builders are trying to be cheap and stingy with outlets). It's the reason why we have breakers and GCFIs and RCBs and AFCIs. It's the reason why we have electrical certification bodies like UL which won't certify your cable or appliance if the cords are too thin.
There's a lot of smart stuff we do behind the scenes to make dumb cords safe because even smart people make dumb mistakes.