Cable shaft installation belongs to cable tray

Proper cable tray shaft installation ensures safe, supported, and code-compliant routing of cables through vertical shafts or risers.

Planning and Design

Before installation, determine the type of cable tray (ladder, ventilated, or solid-bottom) based on cable type, load, and environmental conditions. Cable trays must comply with BS EN 61537 or equivalent standards for manufacturing and installation ( ). Consider the shaft dimensions, load requirements, and future cable expansion.

Vertical shafts require careful planning to maintain minimum bend radii for cables and avoid overcrowding ( ). Support and SpacingCenter-hung supports are recommended for vertical shafts to allow cables to be deposited from each side ( ). Maximum support spacing typically ranges from 3.

6 m for ladder or channel trays, with a maximum load per hanger of 318–340 kg ( ). Ensure rung spacing of 150–230 mm (6–9 inches) for ladder trays to support cables evenly ( ). Use brackets, clamps, or wall-mounted supports to secure trays in shafts, preventing movement during cable installation or short-circuit events ( ).

Installation Practices

Offloading and handling: Use cranes or forklifts carefully to avoid crushing tray siderails; single bundles per lift are recommended ( ). Alignment: Ensure trays are plumb and level in vertical shafts to prevent cable stress. Cable placement: Maintain proper separation between power and control cables to reduce electromagnetic interference ( ).

Covers: Solid or ventilated covers can be used depending on heat generation and protection requirements ( ).

Safety and Compliance

Cable trays are supports, not walkways; do not use them to support personnel ( ). Verify material suitability for environmental conditions (e.g., aluminum for corrosion resistance) ( ). Follow manufacturer guidelines for load ratings, temperature limits, and electrical clearances ( ).

Ensure all components are tested and certified as a system to maintain safety and warranty compliance ( ).

Maintenance Considerations

Inspect trays periodically for loose supports, corrosion, or damage. Avoid overloading trays beyond rated capacity. Maintain access for future cable additions or replacements.

By following these guidelines, cable tray shafts can be installed safely, efficiently, and in compliance with electrical standards, ensuring long-term reliability and protection of installed cables.