Installation steps for trapezoidal vertical shaft cable trays

Trapezoidal vertical shaft cable trays are installed by carefully preparing the site, securing support structures, aligning the tray sections vertically, and ensuring compliance with electrical codes and safety standards.

Preparation and Material Handling

Before installation, all materials should be inspected for damage and verified against approved shop drawings, including tray sections, fittings, and accessories ( ). Cable trays should be stored horizontally on a flat surface with timber supports at regular intervals to prevent deformation and protect from moisture or sunlight ( ). Ensure that all required tools, fasteners, and support hardware are available on site.

Support Structure Design

The support system for vertical shaft trays must be designed by a qualified engineer familiar with local building codes and electrical standards ( ). Supports can include brackets, struts, or frames anchored to walls or structural elements. The spacing of supports should follow manufacturer recommendations, typically closer for vertical runs to prevent sagging and maintain alignment ( ).

Installation Steps

Review Shop Drawings: Confirm the layout, dimensions, and routing of the vertical shaft tray as per approved drawings ( ). Install Supports: Secure brackets or frames at calculated intervals along the vertical shaft. Ensure they are plumb and level to maintain proper alignment.

Assemble Tray Sections: Begin from the bottom or top of the shaft, depending on site access. Connect trapezoidal tray sections using manufacturer-specified bolts, clamps, or connectors ( ). Alignment and Leveling: Continuously check vertical alignment using a plumb line or laser level.

Adjust supports as necessary to maintain a straight vertical run. Secure Fittings: Install elbows, tees, or junctions as required, ensuring smooth transitions to prevent cable damage and maintain minimum bend radius ( ). Grounding and Bonding: Ensure the tray system is properly grounded according to electrical codes to prevent electrical hazards ( ).

Safety and Compliance

Only qualified personnel should perform installation, following local electrical codes and occupational safety procedures ( ). Avoid using the tray as a walkway or support for personnel. Inspect all connections and supports before cable installation to ensure stability and safety ( ).

Final Checks

After installation, verify that all tray sections are securely fastened, aligned, and free from obstructions. Document the installation for compliance and future maintenance ( ). By following these steps, trapezoidal vertical shaft cable trays can be installed safely, efficiently, and in compliance with industry standards.