Trapezoidal cable tray fixing components

Trapezoidal cable trays are typically fixed using trapeze or swing supports with threaded rods, cross members, and tray clips to ensure secure, level, and adjustable installation.Support and Hanger SetupThe most common method for fixing trapezoidal cable trays is the trapeze or swing support system. Begin by installing vertical hangers (threaded rods) from the ceiling or structural support. Thread a hex nut 25 mm to 50 mm above the intended tray bottom, then slide on square washers. The cross member is placed next, followed by a second set of square washers, ensuring all vertical hangers pass through pre-drilled holes in the cross member that are slightly larger than the rod diameter for easy adjustment and to prevent thread damage .Cross Member and Tray Clip InstallationThe cross member should be long enough to accommodate tray clips and allow horizontal adjustment. Thread a second set of hex nuts onto the all-thread rod to bring the top of the cross member snug against the underside of the tray. Ensure the cross member is level, then adjust the top nuts to secure it firmly. Tray clips can be installed either inside or outside the tray depending on space and rung interference, but proper positioning of hangers is critical for stability .Alignment and SecuringBefore installation, verify all trays and accessories against approved material submittals and inspect for damage. Use approved shop drawings and manufacturer instructions to guide placement. Ensure trays are free from dirt, oil, or corrosion, and provide safe access to the installation area . Supports should be spaced according to tray length and load requirements, typically within 24 inches of each end and at intermediate points for longer runs .Fastening and AdjustmentUse appropriate hardware such as hex bolts, serrated flanged nuts, or self-tapping screws to secure tray components. Torque specifications should follow manufacturer recommendations (e.g., 3/8” fasteners to 35 ft-lbs). Field-drill clearance holes through side rails if necessary, and ensure flush contact between splice plates and tray for structural integrity . Horizontal and vertical adjustments can be made by loosening nuts on the threaded rods and repositioning the cross member or tray clips.Safety and ComplianceTrapezoidal cable trays are mechanical support systems for cables only and should not be used as walkways or lifting devices. Installation must comply with local electrical codes, NEMA standards, and project specifications. Properly installed trays prevent cable damage, maintain spacing, and allow for future maintenance .