Horizontal Joint Cable Tray Installation

Proper horizontal joint installation ensures structural integrity, alignment, and safe cable support in cable tray systems.

Planning and Preparation

Before installation, a pre-determined layout plan should be developed by a qualified designer or engineer familiar with local building codes, equipment specifications, and required clearances. This ensures that the horizontal joints align correctly and that the support structure accommodates the tray and any future adjustments. All materials, including ladder trays, fittings, struts, threaded rods, clips, and hardware, should be organized according to their specific functions.

Support Structures

The most common support for horizontal cable tray joints is the trapeze or swing support. Vertical hangers are installed first, projecting through cross members. The cross member should have holes slightly larger than the all-thread diameter (1/16" to 1/8") to allow easy adjustment and prevent thread damage.

Hex nuts and square washers are used to secure the cross member, which must be leveled before attaching the tray clips. Proper positioning of vertical hangers is critical, as horizontal adjustment is limited once the hangers are fixed.

Tray Alignment and Connection

For horizontal joints, ensure that the cross member length allows attachment of tray clips and provides some horizontal adjustment. Tray clips can typically be installed either inside or outside the tray, depending on space and interference with rungs or connectors. The tray sections should be aligned so that the cable support surface is continuous, minimizing gaps or misalignment that could stress cables or reduce load capacity.

Compliance and Safety

Installations should comply with relevant standards such as BS EN 61537 for cable trays and BS 6946 for channel support systems. Cable trays are designed to support cables, not personnel, and safe installation requires using components designed and tested together as a system. Qualified personnel should follow proper torque specifications, maintain minimum bend radii for cables, and ensure that the tray is level and secure to prevent sagging or mechanical damage.

Final Checks

After installation, verify that all horizontal joints are level, secure, and allow for any required cable movement. Ensure that the tray system maintains proper spacing, supports the intended cable load, and meets all electrical and mechanical code requirements. Regular inspection and maintenance are recommended to preserve system integrity and safety.

By following these steps, horizontal joint cable tray installations can achieve structural stability, proper alignment, and safe cable management.