1、 When cable tray wiring is used in places with corrosion or special humidity, corresponding protective measures shall be taken according to different corrosive media, and plastic sheathed cables shall be selected.

二、电缆桥架不宜安装在腐蚀性气体管道和热力管道的上方及腐蚀性液体管道的下方，否则应采取防腐、隔热措施。

2、 The cable tray shall not be installed above the corrosive gas pipeline and heat pipeline and below the corrosive liquid pipeline, otherwise anti-corrosion and heat insulation measures shall be taken.

三、电缆桥架在穿过防火墙及防火楼板时，应采取防火隔离措施。

3、 When the cable tray passes through the firewall and fire floor, fire isolation measures shall be taken.

四、在电缆桥架布线时，其电缆不应有黄麻或其他易延燃材料外护层。

4、 When indoor cable tray wiring is adopted, the cable shall not have jute or other combustible material outer sheath.

五、电缆桥架内的电缆应在首端、尾端、转弯及每隔50m处，没有编号、型号及起、止点等标记。

5、 The cables in the cable tray shall be at the head end, tail end, turn and every 50m without number, model, start and end points, etc.

六、电缆桥架内的电缆应在下列部位进行固定。垂直敷设时，电缆的上端及每隔1.50～2m处。水平敷设时，电缆的首、尾两端、转弯及每隔5～10m处。

6、 The cables in the cable tray shall be fixed at the following parts. When laying vertically, the upper end of the cable and every 1.50 ~ 2m. When laying horizontally, the cable shall be laid at the head and tail ends, turns and every 5 ~ 10m.

七、电缆桥架与各种管道平行或交叉时，其小净距应符合表DQ4-1的规定。

7、 When the cable tray is parallel or crossed with various pipelines, the minimum clear distance shall comply with the provisions of table dq4-1.

八、电缆桥架水平安装时，宜按荷载曲线选取佳跨距进行支撑，跨距一般为1.5～3m。垂直敷设时，其固定点间距不宜大于2m。

8、 When the cable tray is installed horizontally, the best span should be selected for support according to the load curve, and the span is generally 1.5 ~ 3M. When laying vertically, the distance between fixed points shall not be greater than 2m.

九、电缆桥架（托盘）水平安装时的距地高度一般不宜低于2.50m，垂直安装时距地1.80m以下部分应加金属盖板保护，但敷设在电气专用房间（如配电室，电气竖井、技术层等）内时除外。

9、 The height from the ground of cable tray (tray) during horizontal installation shall not be less than 2.50M, and the part below 1.80m from the ground during vertical installation shall be protected by metal cover plate, except when it is laid in special electrical rooms (such as distribution room, electrical shaft, technical floor, etc.).

十、几组电缆桥架在同一高度平行安装时，各相邻电缆桥架间应考虑维护、检修距离。

10、 When several groups of cable trays are installed in parallel at the same height, the maintenance and overhaul distance between adjacent cable trays shall be considered.

十一、在电缆桥架上可以无间距敷设电缆，电缆在桥架内横断面的填充率：电力电缆不应大于40％；控制电缆不应大于50％。

11、 The cable can be laid on the cable tray without interval. The filling rate of the cross section of the cable in the cable tray: the power cable shall not be greater than 40%; The control cable shall not be greater than 50%.

十二、下列不同电压，不同用途的电缆，不宜敷设在同一层桥架上：

12、 The following cables with different voltages and different purposes should not be laid on the same bridge layer:

1）应急照明和其他照明的电缆。

1) Cables for emergency lighting and other lighting.

2）lkV以上和1kV以下的电缆。

2) Cables above lkv and below 1KV.

3）同一路径向一级负荷供电的双路电源电缆。

3) Dual power cables that supply power to the primary load in the same path.

4）强电和弱电电缆。如受条件限制需安装在同一层桥架上时，应用隔板隔开。

4) Strong and weak current cables. If it is required to be installed on the bridge on the same floor due to limited conditions, it shall be separated by partitions.