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）确定方向：根据建筑平面布置图，结合空调管线和电气管线等设置情况、方便维修，以及电缆路由的疏密来确定电缆桥架的好的路由。在室内，尽可能沿建筑物的墙、柱、梁及楼板架设，如许利用综合管廊架设时，则应在管道一侧或上方平行架设，并考虑引下线和分支线尽量避免交叉，如无其它管架借用，则需自设立（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）荷载计算：计算电缆桥架主干线纵断面上单位长度的电缆重量。

(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）确定桥架的宽度：根据布放电缆条数、电缆直径及电缆的间距来确定电缆桥架的型号、规格，托臂的长度，支柱的长度、间距，桥架的宽度和层数。

(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）确定安装方式：根据场所的设置条件确定桥架的固定方式，选择悬吊式、直立式、侧壁式或是混合式，连接件和紧固件一般是配套供应的，此外，根据桥架结构选折相应的盖板。

(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）绘出电缆桥架平、剖面图，局部部位还应绘出空间图，开列材料表。

(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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