dangerous connection between the object and the hot/neutral contacts.
This is one reason ground-up receptacles are commonly associated with commercial, industrial, and medical environments.
Sometimes the Orientation Has Another Meaning
There is another interesting possibility.
In some homes, an outlet installed differently from the others can be used to indicate that it is controlled by a wall switch.
For example, if most of the receptacles in a room have the ground at the bottom but one is reversed, that unusual orientation may help identify the outlet connected to a
