Fabrication of Vertical and Horizontal Cable Trays

Connections between vertical and horizontal cable trays are fabricated using specialized fittings, clamps, and support elements to ensure mechanical stability, proper load distribution, and secure cable routing. Key Considerations1.

Fittings and Connectors

Use elbows, T-pieces, and crossovers to change the direction of cable trays or connect vertical and horizontal sections. These fittings are designed to maintain structural integrity and allow smooth cable transitions ( ). For ladder or perforated trays, ensure that the fitting material matches the tray (e.g., steel, stainless steel, or aluminum) to prevent galvanic corrosion and maintain strength ( ).

2.

Support and Hanger Placement

Vertical trays require secure attachment to walls, steel structures, or concrete using brackets, suspended supports, or center suspensions ( ). Horizontal trays should be supported at intervals according to tray type: maximum 3 m for ladder trays and 2 m for perforated trays to avoid sagging or strain ( ). When connecting vertical to horizontal trays, threaded rods with clamps and washers are commonly used to adjust height and alignment precisely ( ).

3.

Fastening and Alignment

Use tray clips, clamps, and hex nuts to secure tray sections. For vertical trays, cables should be fixed with stainless steel strips (20 mm wide, two per meter) to prevent movement ( ). Ensure proper alignment so that the bend radius of cables is maintained, avoiding sharp bends that could damage insulation ( ).

4.

Load and Safety Considerations

Design the connection to support the maximum expected cable load, typically around 100 kg/m, and include a 20% allowance for future expansion ( ). Verify that the maximum load per hanger is not exceeded (e.g., 318–340 kg per hanger) and that the tray is level and stable ( ). Covers may be required in areas with high mechanical risk, and they should be fabricated from the same material as the tray and secured with manufacturer-recommended clips ( ).

5.

Practical Tips

Ensure smooth transitions between vertical and horizontal trays to facilitate cable installation. Maintain consistent spacing between rungs or perforations to support cables evenly. Use modular systems where possible to simplify future modifications or expansions ( ).

By following these guidelines, connections between vertical and horizontal cable trays can be fabricated to provide mechanical stability, safe cable routing, and compliance with industrial standards.