As a supporting project of wiring engineering, cable tray has no special specification and guidance, and the manufacturer's specification program is lack of universality. Therefore, the design and selection process should be based on the type and quantity of weak current system cables, and select the suitable cable tray reasonably.

（1）確定方向：根據(jù)建筑平面布置圖，結(jié)合空調(diào)管線和電氣管線等設(shè)置情況、方便維修，以及電纜路由的疏密來確定電纜橋架的好的路由。在室內(nèi)，盡可能沿建筑物的墻、柱、梁及樓板架設(shè)，如許利用綜合管廊架設(shè)時，則應(yīng)在管道一側(cè)或上方平行架設(shè)，并考慮引下線和分支線盡量避免交叉，如無其它管架借用，則需自設(shè)立（支）柱。

(1) Determine the direction: according to the building layout plan, combined with the air conditioning pipeline and electrical pipeline setting, convenient maintenance, and cable route density to determine the good route of cable tray. Indoor, as far as possible, it should be erected along the walls, columns, beams and floors of the building. If the utility tunnel is used for erection, it should be erected in parallel on one side or above the pipeline, and the intersection of down lead and branch lines should be avoided as far as possible. If there is no other pipe support for borrowing, it is necessary to set up (support) columns.

（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 the cable per unit length on the vertical section of the trunk line of the cable tray.

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

(3) Determine the width of the bridge: according to the number of cable laying, cable diameter and cable spacing to determine the model and specification of cable tray, the length of bracket arm, the length and spacing of pillars, the width and number of layers of cable tray.

（4）確定安裝方式：根據(jù)場所的設(shè)置條件確定橋架的固定方式，選擇懸吊式、直立式、側(cè)壁式或是混合式，連接件和緊固件一般是配套供應(yīng)的，此外，根據(jù)橋架結(jié)構(gòu)選折相應(yīng)的蓋板。

(4) Determine the installation mode: according to the setting conditions of the site, the fixed mode of the bridge is determined. The suspension type, vertical type, side wall type or mixed type are selected. The connectors and fasteners are generally supplied together. In addition, the corresponding cover plate is selected and folded according to the bridge structure.

（5）繪出電纜橋架平、剖面圖，局部部位還應(yīng)繪出空間圖，開列材料表。

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

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