The National Electrical Code (NEC) rules for the aforementioned are in Sec. 314.28. But don’t confuse them with outlet boxes [314.27(A) through (E)]. The rules for pull boxes, junction boxes, and ...
The only things supporting that “floating” outlet/junction box is the electrical metallic tubing (EMT) connected on the right side of it and the metal cable connected on the left side of it. Neither ...