You’ll find strong opinions on both sides.
Some electricians and safety discussions favor ground-up receptacles because of the potential behavior of a partially inserted plug in certain circumstances.
Others use ground-down receptacles because it is the traditional orientation they’ve used for years.
The key point is that orientation alone isn’t a substitute for proper electrical installation and safety practices.
A correctly wired receptacle, appropriate grounding, suitable protective devices, and proper installation are much more important than whether the little round hole is facing up or down.
What About Tamper-Resistant and
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