Large span cable tray is a type of cable tray with a larger support span than general cable trays, and due to its reasonable structural design, it has the characteristic of greater load-bearing capacity than general cable trays. Therefore, it is not only suitable for laying indoor and outdoor overhead cables in industrial and mining enterprises such as refining, chemical, textile, machinery, metallurgy, power, television broadcasting, but also for laying cables in underground engineering such as subways and civil defense projects.