Power Plant Slotted Cable Tray High Load Cable Support System for Energy Facilities | High Volume Open Slot Steel Duct for Energy Facility Cable Routing Product Overview This power plant slotted cable tray is built for energy facilities that run large volumes of power and control cabling. Wide, deep folded metal sheet sections give the slotted cable tray the structural toughness to form one continuous heavy load duct across switchyards, turbine halls and control buildings.