Wiring tray: intelligent building weak electricity system, usually more information monitoring and communication facilities etc. the corresponding system composition, divided into trough, tray type and ladder rack etc. structure, mechanical and electrical wiring tray is composed of a bracket, bracket and installation of accessories. Selection should pay attention to all parts of the bridge's compliance with requirements set serialization, standardization and generalization. Building bridge can be set up independently, can also attached in all built (structure) to build and rack on the support tube, should reflect the simple structure, attractive appearance, flexible configuration and maintenance is convenient wait for a characteristic, all parts are required for galvanized processing, installation in building open bridge frame, if it is in the adjacent to the sea or belong to the corrosion, the material must have anticorrosive, resistant to moisture.