Cable trays, also known as carriers, are a mechanical support system that holds large networks of cables together. In the electrical wiring of buildings, a cable tray system is used to support insulated electrical cables used for power distribution, control, and communication. Each cable tray type performs a different function and comes in various materials such as aluminum. The cable support lengths and fittings can basically be designed as cable trays, cable ladders or mesh cable trays, in which cables are routed. Unlike conduit systems, cable trays allow cables to be laid in bundles, improving accessibility, heat. -piece tray istypically used in applications where visual esthetics are important.