Connection between trough-type cable trays and trapezoidal cable trays

Trough-type cable trays can be connected to trapezoidal cable trays using transition fittings or custom adapters while ensuring proper support, alignment, and cable protection.

Overview of Trough-

Type Cable Trays

Trough cable trays are designed with moderate ventilation and frequent cable support, typically providing support every 4 inches along the bottom. They are suitable for moderate heat-generating electrical or telecommunication applications and are available in metallic and nonmetallic materials. Support spans generally range from 5 to 12 feet, and trays are mounted using trapeze, wall, floor, or channel methods.

Trough trays are available in heavy, medium, and light-duty load capacities, and their open design allows easy cable access and maintenance.

Considerations for Connecting to Trapezoidal Cable Trays

Transition Fittings: To connect a trough tray to a trapezoidal tray, use adapter plates or custom transition fittings that match the width and sidewall profiles of both trays. This ensures a secure mechanical connection and maintains cable alignment. Support and Span: Both tray types must be supported according to their maximum load and span specifications.

Typically, trough trays require supports every 2. 5 meters (≈8 feet), and trapezoidal trays may have similar or slightly different span requirements. Ensure that the transition section is adequately supported to prevent sagging or stress on cables.

Cable Protection: Maintain rounded edges and smooth transitions to prevent cable damage, especially for fiber optic or sensitive copper cables. Trough trays often have rolled top edges and ventilated designs to reduce heat buildup and protect cables. Alignment and Leveling: Ensure that the bottom of the trough tray aligns with the trapezoidal tray to avoid sharp bends or pinch points.

Use adjustable brackets or shims if necessary to maintain a smooth cable pathway. Grounding and Bonding: When connecting different tray types, ensure electrical continuity by bonding the trays together using grounding lugs or bonding jumpers, particularly if the trays are metallic. Covers and Security: If either tray has a cover, ensure that the transition section accommodates the cover or provides a compatible solution to maintain cable protection and security.

Installation Tips

Minimize jobsite fabrication by using pre-fabricated bends, splices, and transition pieces. Verify load ratings for the combined tray system to prevent overloading. Maintain ventilation in the trough section to prevent heat accumulation in cable bundles.

Ensure easy access for future cable additions or maintenance by using tool-less or removable covers where possible. By following these guidelines, a trough-type cable tray can be effectively integrated with a trapezoidal cable tray, providing a continuous, safe, and structurally sound cable management system.