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Crossarm for fixing cables inside cable trays

Fiber and communications infrastructure knowledge brief Published 01 May 2026

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.

Crossarms inside cable trays are used to support and secure cables, providing stability and proper spacing for cable management.

Purpose of Crossarms

Crossarms are structural components installed within cable tray systems to support the weight of cables and prevent sagging or excessive bending. They are particularly important in large or heavy cable installations, where additional stability is required to maintain the integrity of the cable tray system and ensure safe routing of electrical and communication cables. By providing a horizontal support platform, crossarms help distribute the load evenly across the tray.

Installation and Support

Crossarms are typically mounted using suspension rods or brackets, which connect the crossarm to the ceiling or wall, depending on the installation type. The recommended spacing for crossarms is generally one crossarm every 1. 5 to 2 meters of cable tray, ensuring sufficient structural support for heavier cable loads.

They can be used in combination with other accessories such as cable cleats, fixings, and dividers to secure cables in place and prevent movement.

Materials and Durability

Crossarms are usually made from durable materials like Q235 carbon steel, stainless steel (grades 201, 304, or 316), or aluminum alloys. Surface treatments such as hot-dip galvanizing, powder coating, or aluminum-magnesium-zinc plating are applied to enhance corrosion resistance and longevity, especially in industrial or outdoor environments.

Additional Benefits

Beyond supporting cables, crossarms also facilitate maintenance and cable organization, making it easier to add, remove, or reroute cables without compromising the structural integrity of the tray system. They are an essential component in ensuring compliance with safety standards and maintaining a neat, organized cable management system. In summary, crossarms are critical for fixing and supporting cables within a cable tray, providing both mechanical stability and organized routing for electrical and communication systems.

Crossarm for fixing cables inside cable trays - ALFA PRO COMMUNICATION SYSTEMS (Pty) Ltd [PDF]

Crossarm for fixing cables inside cable trays

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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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