Which type of cable tray should be used for low-voltage wiring in vertical shafts

Wire mesh (basket) cable trays are generally recommended for low-voltage wiring in vertical shafts due to their flexibility, ventilation, and ease of installation.

Recommended Cable Tray Type

For low-voltage systems—including data networking, fiber optics, security, and building automation—wire mesh cable trays (also called cable baskets) are ideal for vertical shafts. These trays are made from welded steel or aluminum wire, providing a lightweight, flexible structure that allows cables to be easily routed, added, or modified without extensive disassembly. Their open design ensures excellent airflow, reducing heat buildup and preventing stress on sensitive cables like fiber optics.

Advantages in Vertical Shafts

Flexibility: Wire mesh trays can be bent or shaped to follow vertical shafts and tight corners, accommodating changes in direction without damaging cables. Ventilation: The open structure allows heat dissipation, which is important even for low-voltage cables in confined vertical spaces. Ease of Installation: Lightweight construction simplifies mounting in vertical runs, and cables can be added or removed without major modifications.

EM

I Considerations: While not fully enclosed, wire mesh trays reduce electromagnetic interference for low-voltage signal cables when properly grounded.

Alternative Options

Perforated (ventilated) trays: These provide more continuous support than wire mesh and are suitable for moderate-weight low-voltage cables. They can be used in vertical shafts if additional cable protection is needed, but they are less flexible than wire mesh. Solid-bottom trays: Offer maximum protection against dust, moisture, and physical impact, and can shield against EMI.

They are generally heavier and more difficult to install in vertical shafts, making them less practical for long vertical runs of low-voltage cables.

Installation Considerations

Ensure minimum bend radius is maintained for fiber optic and high-grade copper cables to prevent signal degradation. Use proper support intervals to prevent sagging or cable stress in vertical runs. Ground the tray system to reduce potential EMI and ensure compliance with NEC, IEC, and NEMA standards.

Plan for future expansion, leaving space for additional cables in the vertical shaft. Conclusion: For low-voltage wiring in vertical shafts, wire mesh cable trays are the preferred choice due to their flexibility, ventilation, and ease of installation, while perforated trays can be considered for additional support, and solid-bottom trays are reserved for environments requiring maximum protection.