Large-span cable trays are assembled from pultruded FRP profiles and one-piece ladders for power cables, control cables, lighting cables and accessories. Compared with the iron bridge, it has a long service life (general design life of 20 years), easy installation and low cost (the specific gravity is only 1/4 of carbon steel, no need for moving fire during construction, the length of a single bridge can reach 8 Meters, even longer), easy to cut, no maintenance and other advantages.
    1. When the height of the bridge is 50 or 100, there are 6 connecting holes at each end, and when the height is 150 or 200, there are 12 connecting holes at each end. 2. Support spacing: The support spacing should be less than or equal to the load curve allowable load and support span.
    3. Bridge Width: When selecting the width of the cable tray, there should be a certain spare space to add cables for the future. 4, separate laying: When there are fewer power cables and control cables, they can be installed in the same cable tray, but the power cables and control cables must be laid apart by partitions.
    5. Cable fixing: When the horizontal bridge is laid horizontally, the connection between the bridges should be set at 1/4 of the span. The cable that runs horizontally is fixed every 2 meters, and the cable that runs vertically is fixed every 1.5 meters.