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Selection points of cable tray


2021-12-21


1) Used in corrosive environmentCable Tray, The trunking and its supports and hangers should be made of corrosion-resistant rigid materials, or anti-corrosion treatment, which should meet the engineering environment and durability requirements.

2) cable tray in the fire requirements of the section, can be in the cable ladder, bridge with fire resistance or flame retardant performance of the plate, net and other materials, forming a closed or semi closed structure, and take in the bridge and its support and hanger surface coating fire retardant coating and other measures, the overall fire resistance should meet the requirements of the relevant specifications or standards.

3) aluminum alloy cable tray should not be used for engineering fire protection requirements of high places.

4) The selection of the width and height of the cable ladder and tray should meet the requirements of the filling rate. Under normal circumstances, the filling rate of the cable ladder and tray is 40% ~ 50% for power cables and 50% for control cables ~ 70%, 10% ~ 25% reserved for engineering development.

5) When the load grade is selected as the cable tray, the uniform load of the cable tray shall not be greater than the rated uniform load of the selected cable tray load grade. When the actual span of the cable tray hanger is not equal to 2m, the uniform load of the cable tray shall meet the requirements.

6) Under the condition of meeting the corresponding load, the specifications and sizes of various components, supports and hangers should match the straight and curved series of pallets and ladders.

7) When selecting the cable tray bend or upper and lower devices, it should not be less than the smaller bending radius allowed by the cable in the cable tray.

8) The steel cable tray with a span of more than 6m and the aluminum alloy cable tray with a span of more than 2m or a load grade D shall be calculated or tested for strength, stiffness and stability according to the engineering situation.

9) When multiple sets of cable trays are laid in parallel at the same height, the maintenance distance between adjacent cable trays should be considered.


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