The electrical code allows outlets to be installed with the ground plug hole facing up, down or sideways. It's up to you, there is no standard electric outlet orientation. So that means there really is no such thing as upside down outlets. Because if a cord or wire were to fall down on a partially plugged in right-side up outlet you would short out between the hot and the neutral. When the outlet is "upside down" in the above situation the wire would touch ground first. The plug that came with the dryer has to be turned 180 degrees so it can plug into the outlet. Anotherwords instead of the cord hanging straight down, it goes up then makes a sharp turn downward. The outlet cannot be turned upside down because it is run with conduit form the bottom. With the ground in the upper position, the ground prong on the plug could pull out with the hot and neutral still energized, thus creating a possible electrocution hazard. Ground should be at bottom that way if the plug is accidentally pulled; the last prong to disconnect will be the ground. The electrical code allows outlets to be installed with the ground plug hole facing up, down or sideways. It's up to you, there is no standard electric outlet orientation. So that means there really is no such thing as upside down outlets.
So although flipping the plug around and inserting it backwards will probably be no problem with regard to the electrical operation of the appliance, it may create a safety hazard by exposing the "hot" half of the outlet, the half not connected to Earth, such that someone might touch it and be shocked.
Some people believe that this upside-down position reduces the possibility of electrical shock. In an upside-down position, if a three-prong plug comes partially out of the receptacle and a metal object should accidentally fall between the faceplate and the plug, the object will first hit the grounding prong.
NEC 210–52 Generally, receptacle outlets in habitable rooms shall be installed so that no point along the floor line (measured horizontally) in any wall space is more than 6 feet from an outlet in that space. An outlet shall be installed in each wall space 2 feet or more in width.
Counting Wires in Electrical Boxes Each insulated wire, all cable clamps combined, all uninsulated wires combined, and each support for light or other fixture count as one wire. Each switch, outlet, or other device counts as two wires.
If your house has two prong outlets with metal boxes, it is possible you can ground your outlets without overhauling the wiring. To find out whether the metal housing is grounded, purchase a circuit tester. Insert one of the tester's prongs into the hot slot (the shorter slot in the outlet).
One reason is Chicago electrical code specifies emt for residential ( I dont think the box orientation is there) and having the boxes mounted horizontal makes the wire pulls a bit easier. The other reason is "that's always how it's been done" and "that's how I was taught"!
Unscrew the two caps on the refill, and throw away the caps. Insert the refill into the warmer unit until it clicks. Adjust the warmer to high or low, depending on preference. Insert the unit upright into an outlet. The plug can be rotated as needed, but make sure to keep it upright to avoid spilling.
Required Outdoor Receptacle Locations Protection may be provided by a GFCI receptacle or a GFCI breaker. One receptacle is required at the front and rear of the house and at a maximum height of 6 feet 6 inches above grade (ground level).
In North America, looking at a wall outlet with the ground pin to the bottom, you will find the neutral conductor hole to be on the left, and it is deeper (wider pin). It would be connected to the white supply wire. The 'hot conductor' is on the right and is smaller, and would have a black or red supply wire.