1. Trough-type cable tray and its supports and hangers shall be made of corrosion resistant rigid materials when used in corrosive environment, or shall be treated with anti-corrosion treatment, which shall meet the requirements of engineering environment and durability.
2. cable bridge, there is a requirement for fire prevention in the segment can be added within the cable ladder, tray with fire or flame retardant performance of the plate, the material such as network forms a closed or semi-closed structure, and take in the steam-water bridge and its surface besmear to brush fire retardant coating, its overall refractory performance should meet the requirements of relevant criteria or standards of the country.
3. in the project fire requirements are higher places, should not use aluminum alloy cable bridge.
4. The width and height of trough-type cable tray should be selected according to the filling rate requirements. The filling rate of cable ladder and tray is generally 40% ~ 50% for power cables and 50% ~ 70% for control cables, and 10% ~ 25% for engineering development margin should be reserved.
5. When choosing the load grade of the cable tray, the uniform load of the cable tray should not be greater than the rated uniform load of the selected cable tray load grade. If the actual span of the bracket and hanger of the cable tray is not equal to 2m, the uniform load of the work should meet the requirements.
6. All kinds of components and supports and hangers should match the straight line segment and bending-through series of pallets and ladders under the condition of meeting the corresponding load.