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How to install low-voltage cable trays in a well

Fiber and communications infrastructure knowledge brief Published 29 Jul 2024

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Proper installation of cable trays in low-voltage electrical wells ensures safe, organized, and maintainable routing of electrical cables while complying with standards and minimizing mechanical and thermal risks.

Planning and Preparation

Before installation, review the approved shop drawings to determine tray routes, lengths, and locations within the electrical well. Ensure the area is cleared of debris and that civil and MEP works are completed. Materials, including cable trays, ladders, fittings, and accessories, should be inspected for damage and verified against approved submittals.

Store trays horizontally on flat surfaces with timber supports at intervals of approximately one meter to prevent deformation and protect from moisture and sunlight.

Selection of Cable Tray System

Cable trays can be solid-bottom, ventilated, or wire-mesh depending on the application. For low-voltage installations, ventilated or wire-mesh trays are preferred to allow heat dissipation and prevent accumulation of dust or moisture. Materials typically include steel, stainless steel, or aluminum, with galvanization or other corrosion-resistant finishes applied based on environmental conditions.

Ensure the tray system complies with BS EN 61537 or equivalent standards for cable support systems.

Installation Guidelines

Support and Mounting: Use wall brackets, suspended supports, or center suspensions to secure trays. Maintain proper spacing between supports, typically every 1. 5 to 3 meters depending on tray type and load.

Ensure supports are anchored to structural elements capable of bearing the load. Routing: Maintain horizontal and vertical runs as per design, avoiding sharp bends. Use fittings such as elbows, T-pieces, and reducers to change direction or dimensions.

Ensure minimum bend radius for cables is respected to prevent damage. Clearances: Maintain sufficient clearance from other services for cable pulling, ventilation, and future maintenance. Avoid interference with pipes, ducts, or other electrical equipment.

Cable Arrangement: Group cables logically by function or voltage level. Avoid overcrowding to reduce heat buildup and facilitate maintenance. Use barrier strips or covers if required for separation or protection.

Safety and Compliance

Cable trays are support systems, not enclosures, and should not be used as walkways or ladders. Ensure installation personnel are trained in electrical safety and standard installation practices. Verify that the system can withstand mechanical loads, environmental conditions, and short-circuit forces as specified in standards like BS 6946.

Proper grounding and bonding of metallic trays are essential to prevent electrical hazards.

Maintenance Considerations

After installation, inspect trays for alignment, secure fastening, and absence of damage. Periodically check for corrosion, loose fittings, or cable displacement. Ensure that any modifications or additions follow the same standards and maintain proper clearances and support integrity.

By following these guidelines, cable trays in low-voltage electrical wells can provide a safe, organized, and durable solution for cable management, ensuring compliance with standards and facilitating future maintenance.

How to install low-voltage cable trays in a well - CJC FIBRE CONSULTANTS [PDF]

How to install low-voltage cable trays in a well

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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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