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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?
Going to take a wild guess and say the same reason you shouldn’t chain extension cords. USB can carry over 200w these days.
Yeah, I think in this case there's a lot more tiny conductors sharing what can add up to pretty high current loads on PD connections. Adding extra connectors adding resistance to low (5-20v) voltage high current connections is adding an extra failure point and increasing resistance on the whole cable run.
Not inherently unsafe, but just not a good idea to promote because you know someone will try to run a 200w charging cable for 30m with like 5 connected cables.
I would hope that a device capable of pulling 200w from USB would be intelligent enough to detect the excessive voltage drop and error out or reduce the current.