Horizontal connection of vertical shaft cable tray

Horizontal cable trays can be connected to vertical trays using risers, helix fittings, or tee fittings to ensure smooth transitions, maintain cable integrity, and optimize space in shafts.

Transition Methods

1. Vertical Risers: Vertical bends, also called risers, are commonly used to move cable trays upward or downward between levels. They allow a horizontal tray to connect to a vertical tray while maintaining the required cable bending radius and structural support . 2. Helix Fittings: Helix fittings are specifically designed for confined spaces, such as shafts, where horizontal-to-vertical transitions are needed. They are available in left or right configurations and in materials like aluminum, pre-galvanized steel, and stainless steel. Helix fittings save space, reduce installation time, and allow a one-person installation by providing a smooth, curved path for cables from horizontal to vertical trays . 3. Tee Fittings: In some cases, a tee fitting can be used to branch a vertical tray from the middle of a horizontal tray. In software modeling (e.g., Revit), the connection may appear seamless without a physical tee fitting, as the system adds a connector at the intersection point to maintain continuity .

Installation Considerations

• Material Compatibility: Ensure the fitting material matches the tray (steel, aluminum, FRP, etc.) to maintain structural integrity and grounding continuity .
• Cable Bending Radius: Maintain the minimum bending radius to prevent cable damage during the transition.
• Load Support: Use appropriate brackets, clamps, or supports to handle the weight of cables in both horizontal and vertical sections .
• Space Optimization: In shafts, helix or curved riser fittings are preferred over sharp 90° bends to save space and reduce stress on cables .
• Connection Security: Use splice plates, bolts, or quick-connect systems to secure the trays and fittings, ensuring stability and compliance with electrical codes .

Summary

For connecting a horizontal cable tray to a vertical tray in a shaft, vertical risers, helix fittings, or tee fittings are the most effective solutions. Helix fittings are particularly advantageous in confined spaces, providing smooth transitions, reducing installation time, and maintaining cable safety. Proper support, material compatibility, and adherence to bending radius and load requirements are essential for a reliable and code-compliant installation .