A useful source:
https://worldofsockets.com/
this post was submitted on 29 Jul 2025
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any of the ones with a ground, i'd say
I recently bought a house built in 1942. Not only did all the power receptacles lack a ground, they had all also been wired with reverse polarity, and for good measure the lower receptacles in all the outlets had been partially blocked by baseboard radiators added a few decades later. Since each room only had one outlet, I had visions of masses of extensions cords and plug expanders somehow not burning the house down or electrocuting anybody.
Fortunately these outlets had all been fed with MC cable (the kind wrapped in a flexible steel sheath) so it was possible to fix and ground everything properly with new receptacles without having to re-wire the entire house.
Ground is a bit overrated, which is why the Japanese don't use it. They use GFCI instead.
Without a ground the only way to trip a GFCI is through your body. GFCI is great, but not infallible. I'll keep my grounds.