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Cable trays erected in utility tunnel

Fiber and communications infrastructure knowledge brief Published 15 Jan 2025

Prepared for preliminary research by the ALFA PRO knowledge desk. Confirm optical interfaces, port or core capacity, electrical input and output, enclosure protection, thermal design and installation limits against current standards and product documentation.

Cable trays provide organized, safe, and efficient support for electrical, communication, and signaling cables in utility tunnels.

Purpose and Benefits

Cable trays in tunnels serve as a support structure for routing cables over long distances without sagging, tangling, or contacting rough tunnel surfaces, which simplifies inspections and maintenance. They protect cables from mechanical damage, moisture, dust, and rodents, ensuring long-term reliability in harsh tunnel environments. Additionally, cable trays allow for multi-layer and bundled cable routing, keeping power, communication, and signaling cables properly separated to prevent interference and safety hazards.

Types of Cable TraysLadder-type trays: Ideal for heavy-duty power cables and long spans, providing strong support and easy access for maintenance. Wire mesh trays: Offer excellent ventilation for cables, reducing heat buildup and allowing flexible routing around bends and inclines. Perforated sheet metal trays: Provide robust protection and are suitable for environments requiring fire resistance or corrosion protection.

GR

P (Glass Reinforced Polyester) trays: Halogen-free, self-extinguishing, and corrosion-resistant, suitable for tunnels with high humidity or chemical exposure.

Installation and Support

Cable trays are typically anchored to tunnel walls or ceilings using brackets, threaded rods, or support systems such as U, I, or STRUT profiles. Modular sections allow trays to follow tunnel slopes, bends, and drops without requiring civil modifications. Accessories like cable clamps, dividers, and covers enhance cable organization and protection.

Multi-layer installations are possible, enabling efficient use of limited tunnel space.

Material and Safety Considerations

Corrosion resistance is critical, especially in road tunnels exposed to chlorides or moisture; stainless steel or GRP trays are commonly used. Fire safety: Certain trays are certified to maintain cable function for 30–90 minutes during a fire, supporting emergency systems and evacuation signals. Load handling: Heavy-duty trays can support both power and data cables while maintaining proper separation and load balance.

Standards and Compliance

Cable trays in tunnels often comply with NFPA 130 and NFPA 502 for transit and tunnel applications, ensuring safety and reliability. Proper planning and selection of tray types, materials, and support systems are essential to meet both mechanical and environmental requirements.

Summary

Using cable trays in utility tunnels ensures organized, safe, and maintainable cable installations. They provide flexibility for routing, protection against environmental hazards, and compliance with safety standards, making them a critical component of modern tunnel infrastructure.

Cable trays erected in utility tunnel - ALFA PRO COMMUNICATION SYSTEMS (Pty) Ltd [PDF]

Cable trays erected in utility tunnel

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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