Choosing the right bend angle depends heavily on two factors: the available installation space and the bending radius of the cables you are pulling. Students trading aid on how best to put an internal 90 degrees bend in steel cable tray. more. using a screwdriver. Only two splices are required to securely connect tray widths of wire basket tray. Is there some similar table or other reference available for the minimum radius of cable tray bends? For example, if we have to make a field bend for a 12” (300mm) metallic ladder tray using straight sections of this tray, then how much. Hubbell's NEXTFRAME® Ladder Tray is the effective and widely used cable runway that supports and delivers bundles of cable between cabinets, racks, and closets, along walls, and suspended from ceilings. The Ladder Tray features light, rugged, tubular steel construction.