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Controlling the elevation change of cable trays

Fiber and communications infrastructure knowledge brief Published 14 Feb 2025

Prepared for preliminary research by the METRA 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 tray elevation changes are controlled by adjusting segment elevations, using vertical alignment references, and incorporating transitions or bends to maintain safe and efficient cable support.

Methods to Control Elevation

Segment Modification: To change the elevation of a cable tray, select the segment you want to adjust and modify its elevation values. This can be done through software tools like AutoCAD MEP, where you can access the Modify Cable Tray dialog box to set new elevations for individual segments or connectors, ensuring proper alignment with adjoining segments. Vertical Alignment Reference: Cable trays use a vertical alignment reference to define starting and ending elevations.

Options include the centerline, top, bottom of the tray, or bottom of hangers. Choosing the correct reference ensures that the tray maintains consistent clearance and supports cables properly throughout elevation changes. Transitions and Bends: When elevation changes are required, use transitions, bends, or additional segments to connect different heights smoothly.

This prevents sharp angles that could stress cables or reduce airflow in ventilated trays.

Best Practices

Support and Load Considerations: Ensure that supports are spaced according to manufacturer recommendations and standards such as BS EN 61537. Wider trays or larger rung spacing may require stronger supports to handle the load without sagging. Cable Segregation: Maintain proper vertical separation between power and instrumentation trays to reduce electromagnetic interference.

Typically, a minimum of 300mm (12 inches) is recommended between high-current and low-current trays. Route Planning: Plan the tray path to minimize unnecessary bends and elevation changes. Smooth, gradual transitions reduce stress on cables and simplify installation.

Safety and Compliance: Only use components designed and tested together as a system. Avoid using cable trays as walkways or supports for personnel, and follow all relevant electrical installation standards.

Summary

Controlling cable tray elevation involves careful segment adjustment, proper vertical alignment, and the use of bends or transitions. Following best practices for support spacing, cable segregation, and route planning ensures a safe, efficient, and code-compliant installation while minimizing stress on cables and maintaining system integrity.

Controlling the elevation change of cable trays - METRA FIBER MARKET [PDF]

Controlling the elevation change of 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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