N is polarized - but it assumes the device will retain the grounding middle pin, which forces a specific orientation. If the device uses two pins, or the user cuts out the middle pin, there’s no physical size difference to prevent inverting the polarity.
B or N. They’re simple and effective, grounded but optionally, but most importantly you can fit two in a small space.
I can’t tell if N is polarized though, so B is the boss
B is upside-down in this picture.
Technology Connections has a whole youtube about how ground should be up so if you drop something and it hits the wire its not dangerous.
Because yes the connections do become live before you push them in the whole way.
N is polarized - but it assumes the device will retain the grounding middle pin, which forces a specific orientation. If the device uses two pins, or the user cuts out the middle pin, there’s no physical size difference to prevent inverting the polarity.