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

submitted 4 months ago by [email protected] to c/[email protected]

115 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] 206 points 4 months ago (62 children)

Anybody care to sum this up for people who can’t watch videos?

[–] [email protected] 331 points 4 months ago* (last edited 4 months ago) (37 children)

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

[–] [email protected] 2 points 4 months ago (4 children)

How did we possibly survive with entirely dumb power chords?

[–] [email protected] 15 points 4 months ago* (last edited 4 months ago)

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.

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