Matters needing attention in the selection of cascade cable tray

The cascade cable tray has the advantages of light weight, simple structure, low cost, high strength, special shape, convenient installation, heat dissipation, good air permeability and so on. it uses the minimum quantitative connecting bolt, which is suitable for the laying of large diameter cable. it is especially suitable for the laying of high and low voltage power cables. 
The cascade cable tray is equipped with a shield, which can be marked when ordering, and all its accessories are common to the tray type and trough type bridge tray. 
The surface treatment of cascade cable tray can be divided into three types: electrostatic plastic spraying, galvanizing and painting, which are treated with special anti-corrosion in heavy corrosion environment. 
Matters needing attention in the selection of cascade cable tray elbow supplier: 
1. When the bridge frame, wire slot and its supports and hangers are used in a corrosive environment, they should be made of corrosion-resistant rigid materials, or anti-corrosion treatment should be adopted, and the anti-corrosion treatment mode should meet the requirements of engineering environment and durability. 
2. in the section with fire prevention requirements, the bridge can add fire-resistant or non-flammable plates, nets and other materials to the cable ladder and tray to form a closed or semi-closed structure, and take measures such as painting fireproof coating on the surface of the bridge and its supports and hangers, its overall fire resistance should meet the requirements of the relevant national codes or standards. 
3. aluminum alloy bridges should not be used in places with high requirements for fire prevention. 
4. the selection of the width and height of the cable ladder should meet the requirements of the filling rate. under normal circumstances, the filling rate of the cable ladder should be 40% 50% for the power cable and 50% 70% for the control cable, and the engineering development margin of 10% should be reserved. 25%. 
5. When selecting the load grade of the cable tray elbow supplier ladder, the working uniformly distributed load of the bridge should not be greater than the rated uniformly distributed load of the selected bridge. If the actual span of the support and hanger of the bridge is not equal to 2m, the working uniformly distributed load should meet the requirements. 
6. under the condition of meeting the corresponding load, the specifications and dimensions of various components and hangers shall match the straight line segment and bend series of pallet and ladder frame. 
7. When selecting the bending, up and down devices of the bridge, it should not be less than the minimum allowable bending radius of the cable in the bridge. 
8. for steel bridges with spans greater than 6m and aluminum alloy bridges with spans greater than 2m or bearing requirements greater than load grade D, the strength, stiffness and stability should be calculated or tested according to engineering conditions. 
9. When several groups of bridges are laid in parallel at the same height, the maintenance and overhaul distance between the adjacent cable trays shall be considered.