Reviving this thread to ask a question specifically about grounded third-party adapters. For context there has been some discussion in the original blog post thread about the rarity of grounded USB chargers and why one might be a good idea.
I recently bought an Anker 727 specifically because it’s grounded, to use as an “all gadgets” adapter when traveling.
But when I first got to use it over the holidays, combined with Anker 100W USB-C cables, I felt the tell-tale leakage current tingling on both my Framework and my Pixel 7 (metal body). Same thing (tingling) with an ungrounded Google USB-C wall-wart from some earlier Pixel.
Now back home, however, I can no longer replicate the “delta” between that Anker/Google chargers and the Framework one. So I don’t know if what I experienced on holiday was the Anker not grounding its USB outputs (note it also serves as a power strip, so presumably those grounds are passed through - didn’t check) - or just a ground wiring issue at the place we were over the holidays.
So, any idea how to test that a USB charger is grounded? I tried a simplistic test with a multimeter with the Framework connected to the FW power adapter, and the adapter not connected to AC. There seemed to be no continuity between the FW body and the adapter’s ground prong. Is this a valid test or is there some (capacitor?) trickery expected to be in the ground connection that’s preventing the continuity from showing in this test?
Can anyone more electrically inclined here shed some light? Is the Anker a disappointment or did I just happen upon a not so well grounded Airbnb (tried the bathroom outlets too, so yikes, maybe).