the position of the grounding pin could potentially affect how the plug’s exposed metal portions interact with the receptacle.
With the grounding opening on top, some electricians argue that a partially inserted plug can be less likely to create a dangerous short circuit in certain scenarios.
This is one reason you may hear people say that ground-up installation is safer.
However, the exact safety implications depend on the plug, receptacle, device, and circumstances. It’s not accurate to say that simply flipping every receptacle upside down automatically makes a home safer.
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