We’ve grown up with the ground prong slot at the bottom of all the electrical outlets we ever saw but many electricians are now installing outlets with the ground slot on top which actually makes the most sense.
Some heavy duty electrical appliances like washers, dryers, and refrigerators have immediate-turn plugs which have the cable pointing in some direction. These outlets should typically point down or in the direction of the cable so it’s not wrapping itself around the plug.
But for most applications, orienting the outlet with the ground slot at the top will prevent shorts in the strange occurrence that your plug pulls a bit out of the wall and something metal like a utensil or picture frame drops down it will only hit the grounding and not the hot pin.
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