Trapezoidal vertical shaft cable tray supports should be installed using a pre-planned layout, proper anchoring, and code-compliant support spacing to ensure safety, stability, and efficient cable routing.

Planning and Preparation

Before installation, review the approved shop drawings to determine the exact layout, vertical and horizontal runs, and locations of the cable trays and supports. Ensure all materials, including trays, fittings, and accessories, are inspected for damage and compliance with project specifications. Maintain a clean work area and coordinate with other trades to avoid clashes with mechanical, plumbing, or structural elements .

Support Selection and Placement

Trapezoidal vertical shaft supports are typically used for vertical cable runs in shafts or service corridors. Common support methods include:

• Cantilever wall brackets: Mounted directly to walls for vertical tray runs.
• Trapeze hangers: Suspended from ceilings or structural members for vertical alignment.
• Threaded rods and struts: Used to secure supports at multiple points along the shaft . Support spacing must comply with load requirements and manufacturer recommendations. For steel or stainless steel trays, spacing is generally determined by tray width, cable weight, and environmental conditions. Proper spacing prevents sagging and ensures mechanical stability .

Installation Steps

1. Mark the Tray Route: Use the approved drawings to mark vertical runs, ensuring adequate clearance for cable pulling and future maintenance.
2. Install Anchors and Brackets: Secure wall-mounted brackets or ceiling hangers using appropriate anchors, considering the shaft material (concrete, masonry, or steel).
3. Attach Vertical Supports: Fix trapezoidal supports to the brackets or hangers, ensuring they are plumb and aligned.
4. Mount Cable Trays: Place the trays onto the supports, using connectors and fasteners to secure them. Ensure trays are level and maintain the minimum bend radius for cables.
5. Check Alignment and Clearance: Verify that all trays are properly aligned, with sufficient spacing from walls, other services, and structural elements.
6. Bonding and Grounding: Connect all trays to the grounding system according to NEC or local electrical codes to prevent electrical hazards .

Material Handling and Safety

• Store trays horizontally on flat surfaces with timber supports to prevent deformation.
• Protect materials from moisture and direct sunlight.
• Use qualified personnel familiar with electrical hazards and local building codes for installation .

Final Checks

• Confirm that all supports are secure and capable of handling the intended cable load.
• Ensure cable fill does not exceed the maximum allowable area to prevent overheating.
• Perform a smooth cable pull-through test to avoid jacket abrasion or conductor damage . By following these steps, trapezoidal vertical shaft cable tray supports can be installed safely, efficiently, and in compliance with electrical codes, ensuring long-term reliability and ease of maintenance.