Typical support spacing for steel cable trays ranges from 1. 5 meters to 6 meters depending on tray size, material gauge, and load conditions. The spacing between trays, whether horizontal or vertical, depends on various factors like cable type, environment, and tray material. Proper installation can significantly reduce electromagnetic interference, prevent fire hazards, and improve overall efficiency. 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. Cable tray size calculation is important for ensuring safe cable installation, proper heat dissipation, and enough spare capacity for future expansion.