Cable trays should be bridged

Cable trays need to be bridged at junctions, tees, and crosses to maintain cable separation, prevent kinking, and ensure signal integrity.

Why Cable Trays Are Bridged

Bridging is necessary when cable trays intersect or split, such as at T-joints, cross-joints, or branch points, to prevent cables from bunching, kinking, or overlapping, which can compromise both mechanical protection and electrical performance . Proper bridging ensures that high-power and low-power cables remain separated, reducing electromagnetic interference (EMI) and maintaining compliance with NEC standards . It also facilitates smooth cable transitions and supports the weight of multiple conductors without overstressing the tray system .

How Bridging Is Implemented

Bridges are typically installed using junction bridge hardware that mounts directly to the tray system. For example, in wire mesh trays, a BC1 Bridge Clip can be bolted to junction hardware such as CE35 or EZT90/RADT90, providing a stable platform for the bridge . The bridge itself often comes predrilled with mounting holes and slots to secure cables with nylon zip ties, keeping them organized and separated . This setup allows for smooth cable transitions and prevents mechanical damage during installation or maintenance.

Best Practices

• Maintain proper spacing: Ensure that the bridge supports the cables without compressing them, respecting the minimum bend radius for each cable .
• Use compatible materials: Select bridges and clips made from materials compatible with the tray, such as steel, aluminum, or fiberglass, depending on environmental conditions .
• Follow NEC guidelines: Ensure that metallic trays and bridging hardware meet grounding and fill requirements, and that cable separation is maintained to prevent EMI .
• Plan for maintenance: Bridges should allow easy access for inspection and future cable additions or replacements . By bridging cable trays correctly, you enhance system reliability, protect cables from mechanical stress, and maintain electrical performance, especially in complex industrial or commercial installations.