Abstract: A junction enclosure assembly including an enclosure having a pair of vertically spaced rails mounted upon the inner surface of the back panel thereof in forwardly spaced relation and a junction mounting panel having a mounting bracket at each of its upper and lower end portions which extend rearwardly and downwardly behind the rails and are inserted behind the rails from above to attach and support the mounting panel upon the rails in a readily, quickly and easily removable manner is disclosed. Threaded interengagement means is carried by the mounting panel for locking same to the rails.