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、電纜橋架布線適用于電纜數量較多或較集中的場所。

1. Cable tray wiring is suitable for places with large number or concentration of cables.

2、在有腐蝕或特別潮濕的場所采用電纜橋架布線時，應根據腐蝕介質的不同采取相應的防護措施，并宜選用塑料護套電纜。

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、電纜橋架水平敷設時的距地高度不宜低于2.5m，垂直敷設時距地高度不宜低于1.8m。除敷設在電氣專用房間內外，當不能滿足要求時，應加金屬蓋板保護。

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.

濟南電纜橋架

Jinan cable bridge

4、電纜橋架水平敷設時，宜按荷載曲線選取合適跨距進行支撐，跨距宜為1．5—3m。垂直敷設時，其固定點間距不宜大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、電纜橋架多層敷設時，其層間距離應符合下列規定：

5. When the cable tray is laid in multiple layers, the interlayer distance shall meet the following requirements:

（1）電力電纜橋架間不應小于0.3m；

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

（2）電信電纜與電力電纜橋架問不宜小于0.5m，當有屏蔽板時可減少到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）控制電纜橋架間不應小于0.2m；

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

（4）橋架上部距頂棚、樓板或梁等障礙物不宜小于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、當兩組或兩組以上電纜橋架在同一高度平行或上下平行敷設時，各相鄰電纜橋架間應預留維護、檢修距離。

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、在電纜托盤上可無間距敷設電纜。電纜總截面積與托盤內橫斷面積的比值，電力電纜不應大于40％；控制電纜不應大于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、電纜橋架不宜敷設在腐蝕性氣體管道和熱力管道的上方及腐蝕性液體管道的下方。當不能滿足上述要求時，應采取防腐、隔熱措施。

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、電纜橋架不宜敷設在腐蝕性氣體管道和熱力管道的上方及腐蝕性液體管道的下方。當不能滿足上述要求時，應采取防腐、隔熱措施。

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、電纜橋架不得在穿過樓板或墻壁處進行連接。

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

11、鋼制電纜橋架直線段長度超過30m、鋁合金或玻璃鋼制電纜橋架長度超過15m時，宜設置伸縮節。電纜橋架跨越建筑物變形縫處，應設置補償裝置。

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.