Different cable trays need to be bridged

Ladder-type cable trays and other open-structured trays often require bridging to support heavy or long cable runs and maintain proper cable spacing.Ladder Cable TraysLadder trays consist of two longitudinal side rails connected by transverse rungs. Bridging is typically required for ladder trays when supporting large power cables or long spans to prevent sagging and maintain the minimum bending radius of cables as they exit the tray . Rung spacing is critical: 6, 9, or 12-inch intervals are common, with wider spacing (9 inches or more) often necessitating bridging to support heavy cables . Bridging ensures cables remain properly supported between rungs and prevents mechanical stress.Perforated and Solid-Bottom TraysPerforated trays provide continuous support with ventilation holes, while solid-bottom trays offer full support for sensitive or contaminant-prone cables . Bridging may be required in perforated trays for long runs or when carrying heavier cables, as the perforations reduce structural rigidity. Solid-bottom trays generally require less bridging due to their continuous support, but bridging can still be used for very heavy loads or extended spans.Wire Mesh and Basket TraysWire mesh trays are lightweight and highly ventilated, ideal for data, telecom, and control wiring . Bridging is often necessary when multiple small-diameter cables are installed in long spans to prevent drooping and maintain neat cable organization . Basket trays, a type of wire mesh tray, also benefit from bridging in long runs or when supporting mixed cable types.Key ConsiderationsCable weight and type: Heavier power cables require closer rung spacing or bridging to prevent sagging.Span length: Longer spans increase the need for bridging to maintain structural integrity.Cable bending radius: Bridging helps maintain the minimum bending radius recommended by cable manufacturers.Aesthetic and safety requirements: Bridging ensures cables remain organized and reduces mechanical stress on connectors and terminations . In summary, ladder trays, perforated trays, and wire mesh/basket trays are the primary types that require bridging, especially when supporting heavy or long cable runs. Solid-bottom trays may require bridging only in exceptional cases. Proper bridging ensures cable integrity, safety, and compliance with manufacturer specifications.