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Installation method for 90-degree elbows in cable trays

90-degree elbows in cable trays are installed by fabricating two 45-degree bends from a straight tray section and securing them with proper supports according to standards.Fabrication of a 90-Degree Elbow
  1. Mark the Center Line: Determine the desired bend location and draw a straight line across the center of the tray base to serve as a reference for cuts .
  2. Mark 45-Degree Cuts: Measure outward from the center line on both sides by a distance equal to the tray width or use a standard range of 45–82 mm depending on tray size .
  3. Cut the Side Channels: Using an angle grinder or hacksaw, cut the tray flanges at a 45-degree angle, stopping at the base .
  4. V-Notch the Base: Remove V-shaped sections from the tray base where the bend will occur to allow the sides to close together .
  5. Form the Elbow: Bend the tray along the cuts to create two 45-degree angles, forming a 90-degree elbow .
  6. Fasten and Protect: Secure the bent sections with nuts, bolts, and washers, and apply cold galvanizing spray to prevent rust .
Installation of the Elbow
  1. Positioning: Place the elbow in the intended location, ensuring alignment with the straight tray sections.
  2. Support Placement: Install supports according to NEMA VE 2 guidelines. Supports should be positioned so that connectors between straight sections fall between the support point and the quarter-point of the span, avoiding the center of the span .
  3. Fastening: Attach the elbow to the support system using guides that allow longitudinal movement. Ensure all joints are bonded with bonding jumpers for electrical continuity .
  4. Expansion Considerations: Provide expansion connectors at building expansion joints and in long outdoor runs at intervals of 30 m (100 ft) or as specified .
  5. Grounding: Ground the cable tray system at least every 15 m (50 ft) and at both ends, and bond all conduit drop-outs to the tray using compression lugs or grounding bushings .
Safety and Compliance
  • Only trained personnel should perform installation, following provincial, federal, and NEC electrical construction practices .
  • Avoid using the tray as a walkway or lifting apparatus.
  • Ensure proper handling during offloading to prevent damage to tray flanges or side rails . By following these fabrication and installation steps, a 90-degree cable tray elbow can be safely and effectively integrated into a cable management system, maintaining structural integrity and electrical safety.
Installation method for 90-degree elbows in cable trays

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