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 cable per unit length on the vertical section of main line of cable bridge.

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 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) 确定安装方式：根据场所的设置条件确定电缆桥架的固定方式，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，此外，根据桥架结构选择相应的改版。

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) 汇出电缆桥架平、剖面图，局部部位还应汇出空间图，开列材料表。

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、如与电力电缆桥架合用时，应将电力电缆和弱点电缆各直一侧，中间采用隔板分隔。

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、弱电电缆与其它低电压电缆合用电缆桥架时，应严格执行选择具有外屏蔽层的弱电系统的弱电电缆，避免相互间的干扰。

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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