Cable tray systems are structural components used to support insulated conductors and control, instrumentation, and communication cables. They are typically installed overhead, along walls, or under raised floors in electrical rooms, industrial plants, process areas, and. Cable trays support insulated electrical cables in industrial and commercial settings. Learn about ladder, perforated, solid-bottom, wire mesh, and channel trays in this complete guide. People use them in many buildings and work places to give cables a steady place to run.