The bridge frame is a general term for a continuous rigid structural system composed of trays, straight sections of ladder frames, bends, accessories, supports, hangers, etc., used to support cables. It is an installation channel used in horizontal wiring and vertical wiring systems. The cable tray is a cable laying device that makes the laying of wires, cables, and pipes standardized, serialized, and universal. Here we need to mention the concept of a tray. Many people mix the tray with the tray and think that the functions are roughly the same, but it is not. There is a big difference between the bridge and the wire trough. The main ones are: the bridge is mainly used for laying power cables and control cables, and the wire trough is used for laying wires and communication cables; the bridge is relatively large (200×100 to 600×200), and the wire trough Relatively small; the turning radius of the bridge is relatively large, and most of the trunking is turned at right angles; the span of the bridge is relatively large, and the trunking is relatively small; the fixing and installation methods are different; in some places, the bridge is not covered, and the trunking is usually full of belts. Cover the closed trough for routing, and the bridge frame is for routing the cable. Therefore, everyone should pay attention to the selection of the bridge, so as not to choose the wrong one and fail to achieve their intended purpose.