Classification: It can be installed overhead with process pipelines; hoisted under floor slabs and beams; side-mounted on indoor and outdoor walls, column walls, tunnels, and cable trench walls, and can also be installed on open-air columns or piers. When hoisting large multi-layer bridges, I-steel columns should be laid symmetrically on both sides as far as possible. The fiberglass bridge can be laid horizontally and vertically, with corner, T-shaped and cross-shaped branches; adjustable width, height, and diameter.

 Installation Precautions:

1. General 　　

1. In order to meet the installation requirements of cable trays in engineering design, this interim regulation is specially formulated. After the national regulations have specific requirements for the installation of cable trays, the national regulations shall prevail. 　　

2. The cable tray is used for laying power cables, control cables, communication cables and self-controlling pipe cables in industrial and mining enterprises and civil buildings.

2.Installation of cable tray 　　

1. The overall layout of the cable tray should be the shortest distance, economical and reasonable, safe operation, and should meet the requirements of construction, installation, maintenance and laying of cables. 　　

2. The cable tray should have sufficient rigidity and strength to provide reliable support for the cable. 　　

3. After the cable is laid, the deflection of the cable tray should not exceed 1/200 of the span of the cable tray. When the span of the cable tray is ≥6000mm, its deflection should not be greater than 1/150 of the span of the cable tray. 　

4. Cable trays should be installed on buildings and structures (such as walls, columns, beams, floor slabs, etc.) as much as possible, in close cooperation with civil engineering. 　　

5. When the cable tray and the process pipe rack are installed together, the cable tray should be arranged on one side of the pipe rack.　

6. When the cable tray is erected in parallel with various pipelines, its net distance should meet the following requirements: 　　

6.1 When the cable tray and general process pipelines (such as compressed air pipelines, etc.) are erected in parallel, no less than 400mm. 　　

6.2 When the cable tray and the corrosive liquid pipeline are erected in parallel, it shall not be less than 500mm. 　　

6.3 The cable tray should not be installed in parallel below the corrosive liquid pipeline or above the corrosive gas pipeline. When it is unavoidable, it should be no less than 500mm. And it should be separated by anti-corrosion baffle. 　　

6.4 The cable tray and the thermal pipeline are erected in parallel, and the thermal pipeline shall not be less than 500mm when there is an insulation layer, and not less than 1000mm when there is no insulation layer. 　　

6.5 The cable tray should not be installed in parallel above the heating pipe. When it is unavoidable to install it in parallel above the heating pipe, it should be no less than 1000mm, and effective heat insulation measures should be taken during it.

7. When the cable tray crosses various pipes, its net distance should meet the following requirements: 　　

7.1 When the cable tray crosses the general process pipeline, it shall not be less than 300mm. 　　

7.2 When the cable tray crosses below the corrosive liquid pipeline or above the corrosive gas pipeline, it should not be less than 500mm, and the cable tray should be protected by an anti-corrosion cover plate at the intersection. The length of the cover plate should not be less than d+2000mm , (D is the outer diameter of the pipe). 　　

7.3 The cable tray crosses the thermal pipeline. When the thermal pipeline has an insulation layer, it should be no less than 500mm. If there is no insulation layer, it should be no less than 1000mm. In addition, insulation boards (such as asbestos boards) should be used at the intersection to protect the cable trays. The length of the hot plate should not be less than d+2000mm. (D is the outer diameter of the thermal pipe insulation)

8. When the cable tray is installed through the wall, the sealing device should be adopted according to the environmental conditions: 　　

8.1 When the cable tray enters the fire-proof and explosion-proof environment through the wall from the normal environment, the corresponding sealing device should be installed on the wall. 　　

8.2 When the cable tray passes through the wall from indoor to outdoor, rainproof measures shall be taken on the outside of the wall. 　　

8.3 When the cable tray is installed from the indoor wall to a higher place outdoors, the cable tray should first be inclined downward to extend a proper distance, and then erected upward to prevent rainwater from flowing into the room along the cable tray. 　　

8.4 When the cable bridge frame passes through the expansion joint, the cable bridge should be disconnected, and the distance of the disconnection should be about 100mm.

9. When two groups of cable bridges are installed on the same beam, the net distance between the two groups of cable bridges should not be less than 50mm. 　　

10. When the cable trays with cables of 10kV and above are installed in multiple layers, the layer spacing is generally not less than 300mm. 　　

11. The distance between the cable tray and the bottom of the floor, beam or other obstacles should not be less than 300mm.　

12. Generally, the distance between the supporting arms of the cable bridge should be about 1.5~3, and check it according to the specific conditions. 　　

13. When the cable tray is installed horizontally, its direct board connection should not be placed at 1/2 of the span or on the support point. 　　

14. The cantilever section that appears when the cable tray is installed should generally not exceed 1000mm. 　　

15. The cable tray should not be used as a pedestrian passage.

16. In one of the following situations, a protective cover should be added to the cable tray: 　　

16.1 When the cable tray is installed outdoors, its uppermost layer or every layer. 　　

16.2 When the cable tray is installed under an iron counter board or a similar device with holes, the uppermost cable tray should be covered with a protective cover. If the width of the uppermost cable tray is smaller than the width of the lower tray, the lower cable tray should also be covered with a protective cover. 　　

16.3 When the cable tray is installed vertically, the cable tray within 2m from the local plane. 　　

16.4 The cable tray is installed in a place that is susceptible to mechanical damage. 　　

16.5 The cable tray is installed in a dusty place. 　　

16.6 Places with special requirements.

17. The cables laid in the cable tray should be fixed with nylon bands, tie wires or metal clips. The fixing points are as follows: 　

17.1 When laying horizontally, the first and last ends of the cable and the two ends of the turn and the middle connector of the cable.