or down?
There isn’t one universal orientation used everywhere. Both ground-up and ground-down installations can be found. Local electrical requirements and installation practices should be followed.
Does an upside-down outlet mean it is wired backward?
No. The receptacle’s physical orientation doesn’t tell you whether the conductors are connected correctly.
Why would an electrician install only one outlet upside down?
There are several possibilities, including circuit identification, a particular installation practice, or simply a replacement being installed differently from the surrounding receptacles.
Without knowing the history of the installation, you can’t
