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> That's not exclusive, USB-C has ground pins. That's a circuit ground, not an earth ground. It's not for connecting the device to an earth pin. > if you remo
by lucumo 4y ago
> That's not exclusive, USB-C has ground pins.
That's a circuit ground, not an earth ground. It's not for connecting the device to an earth pin.
> if you remove the europlug you should see that the charger has a metallic nub onto which the adapter clips.
I see. I looked at mine, a 61W adapter. Interesting that they chose to use a C7/C8 connection with a separate metallic nub, instead of a C5/C6 Mickey Mouse connection.
- heinrich5991 4y agoI actually measured that Dell USB-C chargers forward grounding to the outside metal of the USB-C plug, and the laptop actually uses that grounding for its chassis.
- lucumo 4y agoThis confused me, because there's definitely no pin for an earth ground in an USB connector. So I decided to repeat your experiment and see which pin it uses. Turns out, it's the cable's shield that carries the earth connection. Always cool to learn something.
- masklinn 4y agoThat's really cool, so the connection ground is in the cable, but the earth ground is the connector itself? Is that part of the spec or just something which sometimes happens?
- lucumo 4y agoI don't know if it's specced. I couldn't really find anything more than the pin diagrams on Wikipedia ( https://en.m.wikipedia.org/wiki/USB-C https://en.m.wikipedia.org/wiki/USB-C ). Those don't mention earth ground at all. But since both Dell and Apple are doing it, I guess it's at least an optional thing they can do.