Cable trays for pre-branched cables run in vertical shafts

Vertical cable trays provide a structured, safe, and load-bearing pathway for pre-branched cables in vertical shafts, ensuring proper support, organization, and protection.

Types of Vertical Cable Trays

1. Ladder-Type Vertical Trays: Feature two side rails connected by rungs at regular intervals. They offer excellent load-bearing capacity, heat dissipation, and easy access for installation and maintenance. Ideal for heavy power cables and large fiber optic backbones in riser shafts .
2. Solid-Bottom or Ventilated Trays: Comprise a solid metal base with ventilation holes and shallow side rails. These trays protect against dust, debris, and electromagnetic interference, making them suitable for data centers or office risers where sensitive cables are used .
3. Basket-Type Trays: Made from welded steel wires forming a flexible, open basket. They are lightweight, adaptable, and suitable for smaller instrumentation or control cables .

Installation Considerations

• Cable Weight and Stress: Vertical installations must account for the gravitational load of hanging cables. Pre-branched cables can exert significant downward force, so trays must be rated for the total cable weight .

• Rung Spacing: For small-diameter multi-conductor control and instrumentation cables, rung spacing of 6, 9, or 12 inches is recommended to maintain cable positions and prevent sagging .

• Cable Entry and Exit: Cables may enter or exit the tray from the top or bottom. Ensure the minimum bend radius is respected to avoid conductor damage .

• Safety Measures: Use fail-safe mechanisms such as secondary steel wires or cable pushers to prevent free-fall accidents during installation. Pulling cables downward is riskier than pulling upward due to gravitational acceleration .

• Material Selection: Choose materials based on environmental conditions. Aluminum offers corrosion resistance and light weight, while galvanized or stainless steel provides durability in harsh or wet environments .

Best Practices

• Support and Anchoring: Secure trays to walls or shaft structures at regular intervals to prevent deflection and maintain alignment .

• Heat Dissipation: Ladder-type trays without covers allow maximum airflow, reducing heat buildup in current-carrying conductors .

• Cable Organization: Pre-branched cables should be tied or clipped to rungs to maintain separation and prevent tangling, especially in long vertical runs .

• Professional Installation: Vertical shaft installations are complex and hazardous. Engage experienced installation teams with proper equipment and references for similar projects . Using these guidelines ensures that pre-branched cables in vertical shafts are safely supported, organized, and protected, minimizing the risk of damage and maintaining system reliability.