As a supporting project of wiring engineering, there is currently no specialized specification guidance for cable trays, and the specifications and programs of various cable tray manufacturers lack universality. Therefore, the design and selection process should be based on the types and quantities of cables in various weak current systems, and the appropriate cable trays should be selected reasonably.
(1) Determine direction: Determine the routing of cable trays based on the building layout plan, combined with the setting of air conditioning and electrical pipelines, convenient maintenance, and the density of cable routing. Indoors, try to install along the walls, columns, beams, and floor slabs of the building as much as possible. When using a comprehensive pipe gallery for installation, parallel installation should be carried out on one side or above the pipeline, and consideration should be given to avoiding crossing of down conductors and branch lines as much as possible. If there are no other pipe racks to borrow, self installing (supporting) columns is required.
(2) Load calculation: Calculate the weight of cables per unit length on the longitudinal section of the main cable tray.
(3) Determine the width of the cable tray: Determine the model and specifications of the cable tray, the length of the support arm, the length and spacing of the pillars, the width and number of layers of the cable tray based on the number of cables laid, the diameter of the cables, and the spacing between the cables.
(4) Determine installation method: Determine the fixing method of the bridge according to the setting conditions of the site, choose suspended, upright, side wall or hybrid, and the connectors and fasteners are generally supplied together. In addition, select the corresponding cover plate according to the structure of the bridge.
(5) Draw a plan and section diagram of the cable tray, and also draw a spatial diagram of some parts. List the materials.
2. When used in conjunction with power cable trays, the power cables and weak current cables should be placed on one side each, and separated by a partition in the middle.
3. When weak current cables are used in cable trays with other low voltage cables, it is necessary to strictly select weak current cables with external shielding layers to avoid interference between them.
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