Ceiling Mounted Slotted Cable Tray Warehouse Lighting Cable Duct Support System | Light Open Slot Steel Tray for Overhead Warehouse Lighting Circuits Product Overview This ceiling mounted slotted cable tray is made for warehouses and workshops that run lighting and small power circuits overhead. Lightweight folded metal sheet sections fix to ceiling hangers, keeping the slotted cable tray straight and secure above racking and work zones. Used as a cable support tray and