Method for splicing trapezoidal cable tray elbows

Trapezoidal cable tray elbows are spliced using splice plates aligned with the tray's side rails, secured with bolts, and supported according to manufacturer and code specifications.Step-by-Step Splicing Method1. Prepare the Tray Ends Ensure both elbow and straight tray sections are clean, undamaged, and properly cut to fit. Remove any burrs or sharp edges that could damage cables during installation . 2. Align the Elbow and Tray Sections Position the elbow at the desired angle and align the side rails of the elbow with the adjoining tray section. Proper alignment is critical to maintain structural integrity and prevent cable sag . 3. Install Splice PlatesUse vertical or horizontal splice plates designed for trapezoidal trays.Insert the splice plate into the splice-retention groove (if available) or align it with pre-punched holes on the side rails .Ensure the plate spans both the elbow and the straight section to distribute load evenly. 4. Secure with BoltsFasten the splice plate using the recommended number of bolts, typically two per side for standard elbows, ensuring tight and even torque .Verify that the splice maintains electrical continuity if grounding is required. 5. Support the SplicePosition supports near the splice according to NEMA BI 50015/50016 standards, typically at 1/4 span from the splice to minimize deflection .For heavy cable loads, consider additional support brackets or threaded rods to maintain stability. 6. Inspect and AdjustCheck that the elbow maintains the correct angle and that the splice plate is flush with the tray rails.Ensure there is no interference with cable installation and that the tray is level and secure . 7. Optional AccessoriesFor sensitive circuits, consider wrap-around covers or EMI/RFI shielding at the elbow splice .Use radius limiters or bend guides if forming elbows on-site to prevent sharp bends that could damage cables .Key ConsiderationsAlways follow manufacturer-specific instructions for splice plates and bolt torque.Maintain proper support spacing to prevent sagging or stress at the elbow.Ensure electrical grounding continuity across the splice if required by code.For field-fabricated elbows, carefully measure and cut to maintain the trapezoidal profile and avoid misalignment . By following these steps, trapezoidal cable tray elbows can be securely spliced, maintaining both mechanical strength and proper cable support.