Backplates can be joined together in various combinations of 400mm and 600mm widths and 600mm, 800mm, 1000mm, 1200mm, 1400mm, 1600mm, 1800mm, 2000mm heights. Mounting plates and DIN rails are then fitted.

Top and bottom panels are fitted along with various gland plates. Side panels are then riveted on to form a rigid construction.