Cable trays support insulated electrical cables in industrial and commercial settings. There are several types of cable trays, including ladder, perforated, solid bottom, basket, and channel trays. Wire Mesh Cable Tray. en completely installed, without damage either to conductors or structural system use maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. Unlike conduit systems, cable trays allow cables to be laid in bundles, improving accessibility, heat. Cable trays are components of support systems for power and communications cables and wires. Most of these systems are open, allowing efficient heat.