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I never knew that USB-C extensions are not allowed for a reason (www.youtube.com)

submitted 1 week ago by [email protected] to c/technology

135 comments fedilink hide all child comments

There is a reason for USB-C extensions not to be part of the standard. They can be bothersome in the best case and dangerous in the worst.

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[–] [email protected] 9 points 1 week ago* (last edited 1 week ago)

Correct, except for your example. Firstly, 120 watt USB c cables don't exist, only 60w, 100w, 140w and 240w. And only plugging in a 100w or higher cable into a 60w extension would be dangerous, since it would allow drawing 5 amps on a cable over an extension only designed for 3 amps. However, as soon as your extension is rated for 100w it is completely safe to use with any USB c cable, even those rated for 240w, as those only operate at a higher voltage but still only allow 5 amps max.

I have also never seen an USB C extension cable rated for less than 100w, so this is kind of a moot point. If 60w usb c extensions exist somewhere, they would indeed be dangerous, but I have never come across one