The large load and support distance of cable tray equipment shall be less than the allowable load and support span. When selecting the width of the cable tray, a certain margin shall be reserved for adding cables in the future. When there are few power cables and control cables, the cable tray device can be used, but the power cables and control cables shall be isolated and laid with a partition in the middle.
When the cable tray is laid horizontally, the connecting joints between the trays shall be set at about 1 / 4 of the span as far as possible. The horizontal route shall be fixed every 2 meters and the straight route shall be fixed every 1.5 meters. The cable tray shall be reliably grounded. For example, it is grounded every 30-50m from the cable tray.
In addition to shielding and protective cover for hot-dip galvanized cable bridge equipment, when outdoor equipment is hot-dip galvanized cable bridge, protective cover shall be installed on the top layer to avoid sun and rain. For welding equipment, the thickness of the weld around the weld shall not be less than the thickness of the base metal, and the weld must be subject to anti-corrosion treatment.
The layered placement of cable tray shall be that the weak current control cable is on the upper layer, followed by the general control cable, and the low-voltage power cable and high-voltage power cable are placed in turn. This arrangement is conducive to shielding interference, cooling power cables and facilitating construction.
The spacing of each layer of hot-dip galvanized cable tray is: control cable ≥ 200mm, power cable ≥ 300mm, mechanized laying cable ≥ 400mm.
The layout plan of the cable tray system shall indicate the route of the cable tray, the specification and number of layers of the tray type cable tray or ladder type cable tray, the position of various bends, the setting points of the height adjustment piece, width adjustment piece and the expansion joint of the cable tray, the configuration of supports and hangers and various relevant dimensions.
The cross-sectional drawing of Shandong cable tray system shall indicate the interlayer spacing of Shandong cable tray, the interlayer elevation of supports and hangers, the elevation change of path direction, the installation mode of supports and hangers, etc. Standard series products shall be preferred in the design of cable tray system, and detailed drawings and technical instructions shall be given for non-standard parts required by the project.
The layered design of hot-dip galvanized cable tray has been explained. For more details, please come to the website for consultation!