Bridge is a bridge support and put the cable bracket. Bridge on the engineering is widespread, we must use the bridge as long as the laying of cables, cable tray as a cabling project supporting the project, there is no specific regulatory guidance, a manufacturer specifications program lacks versatility, therefore, the design selection process should be based on the various systems of weak cable seem the type, quantity and reasonable application of the selected bridge. Cable bridge has a wide variety, wide application, high strength, light structure, low cost, simple construction, wiring flexibility and installation standards, good looks and so on. Classification 1 bridge, Cascade cable bridge CQ1-T type Cascade cable bridge is based on the information at home and abroad to improve the design. It is light weight, low cost, unique, easy installation, cooling, ventilation and good. He applied to the larger diameter cable laying ships, suitable for high and low voltage power cables. 2, cable tray cable tray is petroleum, chemicals, light industry, telecommunications and other aspects of application of the most widely used. It is light weight, load, handsome in appearance, simple structure, easy installation, and other advantages. It shall apply to the installation of power cables, but also for control cable laying. 3. Trough Trough cable bridge cable bridge is a fully enclosed cable tray. It is applicable for laying computer cables, communication cables, thermocouple cables and other sensitive system control cables. It controls the mask interfering cables and heavy corrosion protection of the environment of the cable have good results. 4 large span cable bridge line bridge cascade type with good ventilation performance, no dust, no protection against interference. Trough, tray-style bridge line with dust.