This manual is designed to guide workers through the detailed production process of ladder cable trays, including the manufacture of horizontal elbows, tees, crosses, reducing bends, and vertical bends, with emphasis on precision, safety, and quality control. What's Involved in Producing Ladder. Channel cable tray secures cables using Eagle Basket pre-punched holes. Atkore Channel supports single branches of power or. maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. A rung spacing of 6 to 9 inches (150 to 230 mm) is preferable when the cable tray cont d for instrumentation and control applications that require. The 30° Horizontal Elbow is an ideal choice for installations where large diameter cables are involved in long span situations. It effectively reduces the overall tray width and provides a seamless transition between straight sections and fittings. As technology advances, so too does the need for effective support systems. Today, plants and buildings are moving more and more towards automation.