A useful source:
https://worldofsockets.com

What is the best Power Outlet?
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[–] 17 points 1 year ago (4 children)

Yup. Japan also has grounded outlets, though, although they are comparatively rarer.

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  • [–] 11 points 1 year ago*

    I recently had a house built, and most of the outlets do support grounding.

    However, it's not very common to actually use them — many appliances don’t have grounded plugs, or the shapes don’t match.

    I’d say only things like washing machines, microwaves, and rice cookers tend to use them.

    線のときはつなぐ

    U字のは繋げない、PC関連に多い

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