What Disadvantages Should You Keep in Mind When Using Cable Trays? Of course, everything has its cons, and that includes cable trays. However, they are likely to pay for themselves when it comes to. A basket cable tray is a type of cable management system made from welded steel wires that form a mesh or “basket” structure. This open design allows for excellent airflow, easy installation, and quick cable routing. Basket trays are often used in environments where cables need frequent changes. Cable trays, or carrier trays, are mechanical support systems for cables. Cable trays are capable of supporting all types of wiring: such as High Voltage Power Lines.