Porous cable trays balance cable protection and wiring practicality. The open porous structure not only solves the problem of poor heat dissipation in closed cable trays, but also has better cable wrapping protection effect than ladder cable trays. The structure of the bridge tray can organize and store various types of strong and weak electrical cables, communication cables, and control cables, avoiding problems such as wear, entanglement, and disorder caused by exposed cables, making the overall wiring system more organized and orderly. The transparent design of the holes can reduce the accumulation of moisture inside the cable tray, inhibit the growth of mold and rust, and create a dry and stable operating environment for the cables. At the same time, the porous structure is convenient for later line inspection, maintenance, and expansion. Staff can intuitively observe the operation status of cables without dismantling the overall bridge structure, which is suitable for later line renovation and new wiring needs in buildings.