A few more comments on my pic:
- The box is mounted on what once was an exterior wall, but is now enclosed by an addition to the original building; and,
- The box / extension ring is in fact a listed, factory made product. It is intended to attach to a single-gang box, be it a "handy box," or cut-in (old work) box. Finally,
- While not clear in the pic, the 'ring' is NOT attached to a box behind it; it is attached directly to the building. While there is other raceway on the other side of the wall, it does not directly connect to this ring.
I am truly amazed as to how many violations can be put in such a small area.