Twelve wiring rules for cable tray: when selecting cable tray for indoor wiring, the cable shall not have jute or other combustible material outer sheath. 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 straight, the interval between fixed points shall not be greater than 2m. When cable tray wiring is selected in places with corrosion or special humidity, corresponding protection methods shall be adopted according to different corrosive media, and plastic sheathed cables shall be selected. When several groups of cable trays are installed in parallel at the same height, maintenance and overhaul intervals shall be considered between adjacent cable trays.

在电缆桥架上能够无间隔敷设电缆，电缆在桥架内横断面的填充率：电力电缆不该大于40%;操控电缆不该大于50%.电缆桥架水平装置时的距地高度一般不宜低于2.50m,笔直装置时距地1.80m以下部分应加金属盖板维护，但敷设在电气专用房间内时在外。电缆桥架不宜装置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，否则应采纳防腐、隔热办法。）同一路径向一级负荷供电的双路电源电缆，强电和弱电电缆。如受条件约束需安装在同一层桥架上时，使用隔板离隔。

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% Generally, the height of the cable tray from the ground when it is installed horizontally shall not be less than 2.50M. When it is installed vertically, the part below 1.80m from the ground shall be maintained with a metal cover plate, but when it is laid in the special electrical room, it shall be outside. 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 adopted.) Dual power cables, strong current and weak current cables that supply power to class I load in the same path. If it is constrained by conditions and needs to be installed on the bridge on the same floor, the partition plate shall be used for separation.

1. 电缆桥架布线适用于电缆数量较多或较集中的场所。

1. Cable tray wiring is applicable to places with large or concentrated cables.

2. 在有腐蚀或特别潮湿的场所采用电缆桥架布线时，应根据腐蚀介质的不同采取相应的防护措施，并宜选用塑料护套电缆。

2. 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 should be selected.

3. 电缆桥架水平敷设时的距地高度不宜低于2.5m，垂直敷设时距地高度不宜低于1.8m。除敷设在电气专用房间内外，当不能满足要求时，应加金属盖板保护。

3. When the cable tray is laid horizontally, the height from the ground shall not be less than 2.5m, and when it is laid vertically, the height from the ground shall not be less than 1.8m. In addition to laying inside and outside the special electrical room, when the requirements cannot be met, metal cover plate shall be added for protection.

4. 电缆桥架水平敷设时，宜按荷载曲线选取佳跨距进行支撑，跨距宜为1.5～3m。垂直敷设时，其固定点间距不宜大于2m。

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

5. 电缆桥架多层敷设时，其层间距离应符合下列规定：

5. When the cable tray is laid in multiple layers, the distance between layers shall comply with the following provisions:

1）电力电缆桥架间不应小于0.3m；

1) The distance between power cable trays shall not be less than 0.3m;

2）电信电缆与电力电缆桥架间不宜小于0.5m，当有屏蔽盖板时可减少到0.3m；

2) The distance between telecommunication cable and power cable bridge shall not be less than 0.5m. When there is a shielding cover plate, it can be reduced to 0.3m;

3）控制电缆桥架间不应小于0.2m；

3) The distance between control cable trays shall not be less than 0.2m;

4）桥架上部距顶棚、楼板或梁等障碍物不宜小于0.3m。

4) The distance from the upper part of the bridge to the ceiling, floor or beam and other obstacles shall not be less than 0.3m.

6. 当两组或两组以上电缆桥架在同一高度平行或上下平行敷设时，各相邻电缆桥架间应预留维护、检修距离。

6. When two or more groups of cable trays are laid in parallel at the same height or up and down, a maintenance and overhaul distance shall be reserved between adjacent cable trays.

7. 在电缆托盘上可无问距敷设电缆。电缆总截面积与托盘内横断面积的比值，电力电缆不应大于40％；控制电缆不应大于50％。

7. Cables can be laid on the cable tray without distance. The ratio of the total cross-sectional area of the cable to the cross-sectional area in the tray shall not be greater than 40% for power cables; The control cable shall not be greater than 50%.