With the rapid development of China's electric power industry, the use of cable tray has become more and more widely. Today, the editor will introduce the laying specifications of cable tray.

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 suitable for places with large number or concentration of 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 is used for wiring in places with corrosion or special humidity, corresponding protective measures should 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 should not be less than 2.5m, and when it is laid vertically, the height from the ground should 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.

济南电缆桥架

Jinan cable bridge

4、电缆桥架水平敷设时，宜按荷载曲线选取合适跨距进行支撑，跨距宜为1．5—3m。垂直敷设时，其固定点间距不宜大2m。

4. When the cable tray is laid horizontally, the appropriate 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 should not be larger 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 interlayer distance shall meet the following requirements:

（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问不宜小于0.5m，当有屏蔽板时可减少到0.3m；

(2) The distance between telecommunication cable and power cable tray should not be less than 0.5m, and it can be reduced to 0.3m when there is shielding plate;

（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 between the upper part of bridge and obstacles such as ceiling, floor or beam should 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, the maintenance and overhaul distance shall be reserved between adjacent cable trays.

7、在电缆托盘上可无间距敷设电缆。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. The cable can be laid on the cable tray without space. 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 the power cable and 50% for the control cable.

8、电缆桥架不宜敷设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。当不能满足上述要求时，应采取防腐、隔热措施。

8. The cable tray should not be laid above the corrosive gas pipeline and heat pipeline and below the corrosive liquid pipeline. When the above requirements cannot be met, anti-corrosion and heat insulation measures shall be taken.

9、电缆桥架不宜敷设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。当不能满足上述要求时，应采取防腐、隔热措施。

9. The cable tray should not be laid above the corrosive gas pipeline and heat pipeline and below the corrosive liquid pipeline. When the above requirements cannot be met, anti-corrosion and heat insulation measures shall be taken.

10、电缆桥架不得在穿过楼板或墙壁处进行连接。

10. Cable trays shall not be connected through floors or walls.

11、钢制电缆桥架直线段长度超过30m、铝合金或玻璃钢制电缆桥架长度超过15m时，宜设置伸缩节。电缆桥架跨越建筑物变形缝处，应设置补偿装置。

11. When the length of straight section of steel cable tray exceeds 30m, or the length of aluminum alloy or glass fiber reinforced plastic cable tray exceeds 15m, expansion joints should be set. Compensation device shall be set at the place where the cable tray crosses the deformation joint of the building.