What type of cable tray should be used in the vertical shaft

Ladder-type cable trays, particularly galvanized iron (GI) ladder trays, are the preferred choice for vertical shafts due to their strength, ventilation, and ability to support heavy cables safely.Recommended Types for Vertical Shafts

Ladder-Type Cable Trays: These feature two side rails connected by rungs, forming a ladder-like structure. They are ideal for vertical shafts because they provide high load-bearing capacity, excellent heat dissipation, and easy access for installation and maintenance. Ladder trays are particularly suitable for heavy power cables and large fiber optic backbones in riser shafts, ensuring cables do not sag or get damaged under their own weight . Galvanized Iron (GI) Ladder Trays: A specialized form of ladder tray made from galvanized steel, offering corrosion resistance and durability for both indoor and outdoor vertical applications. The perforated rungs allow secure cable support while maintaining airflow, which is critical for preventing overheating in vertical runs . Wire Mesh (Basket) Trays: These are lightweight, open-grid trays made from welded steel wires. They are suitable for lightweight data, telecom, and control cables in vertical shafts, especially where frequent changes or additions to the cabling are expected. Proper brackets or riser clamps are required to secure them vertically . Solid-Bottom or Perforated Trays: Solid-bottom trays provide maximum protection against dust, debris, and EMI, making them suitable for sensitive data cables in office or data center risers. Perforated trays offer a compromise between support and ventilation, suitable for mixed cable types .

Key Considerations

• Load Capacity: Ensure the tray can support the total weight of cables in the vertical run. Ladder trays excel in heavy-duty applications.
• Airflow and Cooling: Open designs like ladder and wire mesh trays allow heat dissipation, preventing cable overheating.
• Cable Protection: Solid-bottom trays protect sensitive cables from environmental hazards.
• Compliance: Installation should adhere to NEC and local electrical codes for riser cables.
• Future Expansion: Choose a tray that allows easy addition of new cables without compromising safety or organization .

Conclusion

For most vertical shaft installations, GI ladder-type cable trays are the optimal choice due to their strength, durability, and ability to safely support heavy cables. For lighter or frequently modified cabling, wire mesh trays can be used, while solid-bottom or perforated trays are recommended for sensitive data or mixed cable systems. Proper mounting, spacing, and bend radius fittings are essential to maintain cable integrity and compliance.