How to connect trough-type cable trays

Trough-type cable trays are typically connected using splice plates and modular fittings that securely join tray sections while maintaining structural integrity and cable support.

Overview of Trough-Type Cable Tray Connections

Trough-type cable trays, whether solid or ventilated, are modular systems designed for easy assembly and expansion. Each tray section features side rails and a bottom (solid or ventilated), and sections are joined end-to-end to form continuous cable runs . The connection method ensures that the trays remain aligned, stable, and capable of supporting the weight of cables without sagging.

Splice Plates

The most common method for connecting trough-type trays is the use of splice plates. These are flat metal plates that are bolted across the adjoining ends of two tray sections. Splice plates:

• Align the side rails of adjacent trays
• Provide mechanical strength to the joint
• Maintain electrical continuity if required for grounding
• Allow for easy disassembly or expansion of the tray system Bolts, nuts, and washers are typically used to secure the splice plates, and the number of bolts depends on the tray width and load requirements.

Additional Connection Considerations

• Reducers and Transitions: When connecting trays of different widths or types (e.g., ladder to trough), reducers or transition fittings are used to ensure smooth cable passage .
• Support Integration: Connections are often reinforced by trapeze hangers, wall brackets, or center-span supports to maintain stability over long runs .
• Covers and Hold-Down Clamps: If the trough tray has a cover, hold-down clamps secure the cover to the tray base, completing the assembly and protecting cables .

Summary

In practice, splice plates combined with bolts and modular fittings form the standard connection method for trough-type cable trays. This approach provides a secure, flexible, and code-compliant system suitable for industrial, commercial, and sensitive installations, ensuring both mechanical stability and proper cable support .