Allow sufficient space for cable installation, side-by-side routing, and future additions; avoid filling trays to the point where heat dissipation is compromised. 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. Cable tray installation must comply with specific technical standards to ensure electrical safety, system reliability, and long-term maintainability. Route. 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. The spacing between trays, whether horizontal or vertical, depends on various factors like cable type, environment, and tray material. This article provides an in-depth. Scope :- This specification covers the following major activities; - Fabrication and installation of Mild Steel (MS) support structure for Galvanized Iron (GI) Cable tray. Seismic Category II cable trays and their supports are also designed utilizing the design criteria of this appendix.