Cable tray bends are designed to guide cables around obstacles, changes in direction, or elevations in an electrical system. This publication is intended as a practical guide for the proper and safe* installation of cable ladder systems, cable tray systems, channel support systems and associated supports. The Ladder Tray features light, rugged, tubular steel construction. Click "Calculate" to see the minimum bending radius and the recommended standard tray bend radius (300mm to 900mm) required for safe installation. You can enter an offset value or select from a list of remembered offset values. Locks or unlocks the elevation for the segment.