A useful source:
https://worldofsockets.com

What is the best Power Outlet?
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[–] 9 points 1 year ago

Also:

Thin stamped construction is cheap, but can still be fitted with sleeving on the live (active and neutral) pins like UK & europlug, but not US plugs. This prevents objects or fingers getting to live pins on a partially inserted plug.

Industry has agreed that leads exit either straight out, or down-and-right, so there is no conflict for horizontal or vertical sockets. Sockets are universally installed earth-down.

Reasonably compact.

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