Cable tray lines are continuous, consisting of interconnected straight cable tray pieces and components such as reducers and curves, or miter joints instead of curves. Cable tray parts do not fully or partly overlap each other. Cable tray parts that should accept air. Is your cable tray system optimized for safety, dependability, space and cost savings? Cable tray (or cable ladder) systems are a popular alternative to electrical conduit systems, as they have an outstanding record for dependable service, design flexibility and cost savings in commercial and. en completely installed, without damage either to conductors or structural system use 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. Cable sag results from incorrect spacing of cable tray supports or from employing the incorrect tray type that is, light-duty perforated trays in high-load applications. Complicating the problem are overloaded trays and large unsupported spans. Sagging causes tension at connection points. This range allows for easy access and efficient maintenance. When using hanging rod supports, the rod's diameter should be no. Cable tray dimensions are not chosen at random. Across most global markets, they follow well-established dimensional ranges so that trays, fittings, covers, and supports remain compatible, code-compliant, and structurally predictable.