1)  Determine the direction: according to the building layout plan, combined with the setting of air-conditioning pipelines and electrical pipelines, to facilitate maintenance, and the density of cable routing to determine the best route of cable tray. Indoor, as far as possible, along the wall, column, beam and floor of the building. If it is necessary to use the comprehensive pipe gallery for erection, it should be erected in parallel above one side of the pipeline, and the down lead box should be considered The branch line should avoid crossing as far as possible. If there is no other pipe support to borrow, it is necessary to set up (support) column by itself.

2) 荷載計算：計算電纜橋架主干線縱斷面上單位長度的電纜重量。

2) Load calculation: calculate the weight of cable per unit length on the vertical section of main line of cable bridge.

3) 確定橋架的寬度：根據布放電纜條數、電纜直徑及電纜的間距來確定電纜橋架的型號、規格，托臂的長度，支柱的長度、間距，橋架的寬度和層數。

3) Determine the width of cable tray: determine the model and specification of cable tray, the length of bracket, the length and spacing of pillar, the width and number of layers of cable tray according to the number of cables, cable diameter and cable spacing.

4) 確定安裝方式：根據場所的設置條件確定電纜橋架的固定方式，選擇懸吊式、直立式、側壁式或是混合式，連接件和緊固件一般是配套供應，此外，根據橋架結構選擇相應的改版。

4) Determine the installation mode: determine the fixing mode of cable tray according to the setting conditions of the site, and select the suspension type, vertical type, side wall type or mixed type. The connectors and fasteners are generally supplied together. In addition, select the corresponding revision according to the bridge structure.

5) 匯出電纜橋架平、剖面圖，局部部位還應匯出空間圖，開列材料表。

5) The plan and section of cable tray shall be exported, and the space diagram and material list shall be exported for local parts.

2、如與電力電纜橋架合用時，應將電力電纜和弱點電纜各直一側，中間采用隔板分隔。

2. If it is used together with power cable tray, the power cable and weak cable shall be separated on each straight side with partition board in the middle.

3、弱電電纜與其它低電壓電纜合用電纜橋架時，應嚴格執行選擇具有外屏蔽層的弱電系統的弱電電纜，避免相互間的干擾。

3. When the weak current cable and other low-voltage cables share the same cable tray, the weak current cable of the weak current system with external shielding layer shall be strictly selected to avoid mutual interference.

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