Closed Trough Cable Tray | Custom Solid-Bottom Anti-Corrosion Cable Tray for Protected Electrical & Communication Cabling Product Overview Secure cable shielding is essential to maintain stable operation of power and communication engineering facilities. Our closed trough cable tray adopts solid-bottom structure, which distinguishes it from perforated ventilated cable tray. Equipped with matching removable cover plates, it creates an enclosed space to shield wiring from dust,