Height Above Ground: Cable trays should ideally be installed at least 2. 3 meters from the ceiling or any other obstructions. We engage with contractors and consultants during planning stages because Civil Defence compliance is not achieved at the. 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. This publication is intended as a practical guide for the proper and safe* installation of cable ladder systems, cable tray systems, channel support systems and associated supports. Cable ladder systems and cable tray systems shall be manufactured in accordance with BS EN 61537, channel support. They are recommended for heavy cable runs as they provide good cable support as well as adequate ventilation. Fittings can, on the one hand, be used for horizontal or vertical changing of the routing direction or, on the other, to change the height or width of the. Coordinate with Building Structure: Cable tray routing should align with architectural design, avoiding unnecessary crossings, detours, or overlaps with other pipelines.