How well do you know the Code? Think you can spot violations the original installer either ignored or couldn't identify? Here's your chance to moonlight as an electrical inspector and second-guess someone else's work from the safety of your living room or office. It's your turn to identify the violation.
Hint: Half-price sale
Perhaps someone misread the blueprint or their tape measure, but in any case the location of this box makes it nearly impossible to access the wiring inside it without damaging the finish of the building.
According to 314.29, "Boxes, conduit bodies, and handhole enclosures shall be installed so that the wiring contained in them can be rendered accessible without removing any part of the building or, in underground circuits, without excavating sidewalks, paving, earth, or other substance that is to be used to establish the finished grade." The wallpaper and sheetrock may need to be cut away in order to remove the plate and switch in order to access the wiring in the box.
Also, in accordance with 404.9(A), "Faceplates provided for snap switches mounted in boxes and other enclosures shall be installed so they completely cover the opening and, where the switch is flush mounted, seat against the finished surface." This switch plate was trimmed to fit the wall line. It does not completely cover the box opening. The wall is covering the rest of the box opening.