Installation procedure for cable trays on pavement

Cable trays on pavement should be installed on properly prepared supports with correct alignment, spacing, and safety measures to ensure durability and compliance.

Preparation and Material Inspection

Material Verification: Inspect all cable trays, fittings, and supports for damage, coating integrity, and compliance with approved submittals before installation. Remove any damaged or non-conforming items from the site. Site Clearance: Ensure the pavement area is clean, level, and free of debris or obstructions.

Mark the tray routes according to approved shop drawings, maintaining horizontal and vertical alignment. Safety Measures: Set up barricades, warning signs, and ensure safe access for workers. Conduct a toolbox talk and safety briefing before starting work.

Support and Mounting

Support Installation: Use metal channels, 'L' angles, or slotted supports fixed to the pavement with appropriate anchors. Maintain a maximum spacing of 1. 2 meters between supports for straight runs to prevent sagging.

Bends and Offsets: Provide additional supports near bends, branches, and offsets to maintain stability. Ensure supports allow for thermal expansion and future maintenance access. Direct Mounting: Avoid direct contact of trays with the pavement; maintain a minimum 50 mm clearance to prevent corrosion and allow cleaning.

Tray Installation

Alignment: Place trays on supports, ensuring proper horizontal and vertical alignment using spirit or laser levels. Connection: Use approved fittings and spring knots to connect trays securely. Apply expansion fittings where required and paint cut ends to prevent corrosion.

Bonding and Grounding: Install bonding jumpers and connect trays to the main earthing system to ensure electrical continuity. Labeling: Tag or label trays to distinguish power, data, and control circuits for easy identification.

Final Checks

Inspection: Verify that all trays are free from damage, properly aligned, and securely fixed. Check that all fasteners are tightened and supports are stable. Documentation: Record installation details, including photographs, inspection reports, and any deviations from the approved drawings.

Protection: Cover trays exposed to sunlight or moisture during installation to prevent damage. Following this procedure ensures that cable trays installed on pavement are safe, durable, and compliant with engineering standards, while allowing for future maintenance and cable management.