Secures the tray (especially ladder or perforated types) to the support structure (bracket or trapeze). Shields cables from dust, moisture, falling debris, and UV light (indoor or outdoor use). A cable tray system forms a structural framework. Each cable tray type performs a different function and comes in various materials such as aluminum, galvanized steel, and FRP. Non-Metallic What is Cable Tray? A cable tray is a unit, or set of units, with their fittings forming a rigid structure to support cables. The main types of accessories are categorized by their function: Fittings change the path or size of the run, including Elbows (for horizontal or vertical direction changes), Tees and Crosses (for multi-directional junctions), and Reducers (to transition between different tray widths). Support. 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. In the electrical wiring of buildings, a cable tray system is used to support insulated electrical cables used for power distribution, control, and communication. es in the industrial environment.