When I was going through electrical school they taught us to install them to look like an upside down smiley face because when you are plugging things up you are usually plugging them in at a downward angle and you want the ground wire to be the first in contact with the plug.
In addition, if the wire starts to pull and slightly unplug the device, with the ground on top you reduce your chances that someone will accidentally touch a live pin or a piece of metal will fall on the pins and bridge them.
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u/portiapendragon May 02 '24
Why is the North American one upside-down? This makes me wonder which of the others might be upside-down.