Abstract: A simple and inexpensive skeleton frame for a fabricated structure for housing electrical equipment comprises upstanding legs which are arranged at the corners of the frame and which are secured together at the top and bottom of the frame by endless flexible frame metal bands surrounding the legs and maintained in tension by bracing devices positioned between the legs. Each bracing device comprises a central hub, elongate braces extending outwardly from the hub and each engaging a leg, and screw threaded adjustable means for urging the braces outwardly to maintain the endless band under such a tension that the frame is held rigid. The bottom, sides and top of the frame are clad with sheet metal and a hinged door.