- grounding opening
The hot and
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neutral slots are different sizes on a polarized receptacle, helping ensure that a polarized plug is inserted in the intended orientation.
The third opening provides the grounding connection for compatible plugs.
So when you see that little U-shaped opening, you’re looking at an important safety feature.
Why Would Someone Put the Ground Hole on Top?
There are several reasons an electrician or facility might choose that orientation.
One of the most commonly discussed reasons involves what happens if a plug partially falls out of the receptacle.
Imagine a heavy plug
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is connected to an outlet.
Over time, gravity or tension from the cord causes the plug to sag.
If the grounding pin is at the top, it can remain engaged with the grounding contact while the energized blades are partly withdrawn.
That can be viewed as an additional safety consideration in certain situations.
The idea becomes particularly relevant with metal plugs or cords where something could potentially fall across exposed portions of the plug.
However,
