Cable Tray and Hanger Installation Requirements

Cable trays must be supported at regular intervals with properly rated hangers to ensure safe load distribution, prevent sagging, and comply with standards such as BS EN 61537.Support Spacing and Load CapacityCable trays should be supported at intervals that prevent excessive deflection and maintain structural integrity. For ladder-type trays, maximum support spacing is typically 3.6 meters (12 feet), with each hanger rated for a load of 318–340 kg (700–750 lbs) . Solid or ventilated trays may require closer spacing depending on the tray material, width, and cable load . Always consult manufacturer specifications for exact load ratings and spacing.Hanger Types and InstallationCenter-hung supports allow cables to be deposited from both sides, facilitating easier installation .Wall-mounted or ceiling-mounted brackets are used where center-hung support is not feasible.Hangers must be securely fastened to structural elements capable of supporting the combined weight of the tray and cables.Avoid using trays as walkways or lifting points, as this can damage the system and compromise safety .Material and Environmental ConsiderationsCable trays are typically made of steel, stainless steel, or aluminum, with galvanization or coatings to resist corrosion .Environmental factors such as humidity, temperature, and chemical exposure should guide material selection.Aluminum trays offer excellent corrosion resistance due to a natural oxide layer, making them suitable for outdoor or industrial environments .Installation Best PracticesEnsure trays are installed level and aligned to prevent cable stress.Maintain minimum bend radii for cables at tray exits to avoid damage .Use system components designed and tested together to ensure safety and compliance .Stack and store trays properly before installation to prevent deformation or corrosion .Compliance and StandardsCable tray systems should comply with BS EN 61537 for trays and ladders, and BS 6946 for channel support systems .Installation should be performed by competent personnel familiar with electrical installation practices and safety requirements.CE marking or equivalent certification ensures compliance with relevant European or national standards . By following these guidelines, cable tray installations will maintain structural integrity, support cable loads safely, and comply with industry standards.