哪些电缆不能铺设在同一个电缆桥架中？

Which cables cannot be laid in the same cable tray?

《民用建筑设计规范》规定，不同电压、不同用途的电缆不得敷设在同一层电缆桥架上：

The code for design of civil buildings stipulates that cables with different voltages and different purposes shall not be laid on the same cable tray:

1)kV以上和1kV以下的电缆。

1) Cables above kV and below 1KV.

2)双电路从同一路径向主要负载供电。

2) The two circuits supply power to the main load from the same path.

3)应急照明和其他照明用电缆。

3) Cables for emergency lighting and other lighting.

4)强弱电电缆。因条件需要安装在同一层桥架上时，应采用隔板隔开。

4) Strong and weak current cables. If it is required to be installed on the bridge of the same floor due to conditions, partition plates shall be used for separation.

对电缆桥架的刚度有什么要求？

What are the requirements for the rigidity of cable tray?

1、电缆桥架热镀锌防腐处理的技术质量应符合质量规定。

1. The technical quality of hot galvanizing and anti-corrosion treatment of cable tray shall comply with the quality regulations.

2、托盘、梯子需要承受短期附加集中载荷时，应符合电缆桥架的相应规定。

2. When the tray and ladder need to bear the short-term additional concentrated load, it shall comply with the corresponding provisions of the cable tray.

3、生产厂家应给出各种型号规格的托盘、梯子在不同载荷和支吊架跨度下的挠度值。

3. The manufacturer shall provide the deflection values of trays and ladders of various models and specifications under different loads and support and hanger spans.

4、对锌镍中金等经过防腐处理的电缆桥架，要进行试验才能获得验证结果，要有明确的技术指标和检测方法。

4. For the cable trays that have undergone anti-corrosion treatment, such as zinc, nickel, gold, etc., the verification results can only be obtained through tests, and there should be clear technical indicators and detection methods.

5、工厂应备有各种型号的托盘、电缆桥架梯，以及不同跨度和允许均布载荷的关系曲线或数据表。托盘和梯子在额定均匀载荷下的相对挠度不应小于1/200。

5. The factory shall be equipped with trays and cable tray ladders of various models, as well as relationship curves or data sheets of different spans and allowable uniform load. The relative deflection of tray and ladder under rated uniform load shall not be less than 1/200.

如何处理 济南电缆桥架的伸缩缝？

How to deal with the expansion joint of Jinan cable tray?

跨越伸缩缝的桥梁至少一侧有较长的直段，应超过30m，或伸缩缝两侧的桥梁总长度为30m，且无水平或垂直弯曲中间。为了在桥架中留出电缆（或电线）的伸缩余量，该余量应大于伸缩缝的宽度L。

At least one side of the bridge crossing the expansion joint has a long straight section, which should exceed 30m, or the total length of the bridge on both sides of the expansion joint is 30m, and there is no horizontal or vertical bending middle. In order to reserve expansion allowance for cables (or wires) in the bridge, the allowance shall be greater than the width l of the expansion joint.

当伸缩缝处桥下有足够空间时，可将桥断开。断开距离B应大于建筑物伸缩缝的宽度L，并且要保证所有电缆都能随伸缩缝伸缩而不受损坏，满足伸缩要求。，要求电缆的弯曲半径R较小。

When there is enough space under the bridge at the expansion joint, the bridge can be disconnected. The disconnection distance b shall be greater than the width l of the expansion joint of the building, and all cables shall be able to expand with the expansion joint without damage, meeting the expansion requirements., The bending radius r of the cable is required to be small.

若伸缩缝处桥下空间不足，应在伸缩缝附近设置加宽直通，加宽直通规格应能留有足够的电缆伸缩余量（大于L），同时它可以满足电缆扩展所需的更小的弯曲半径。伸缩缝两侧加宽直通间的距离B可以略大于伸缩缝的宽度L。

If the space under the bridge at the expansion joint is insufficient, a widened straight through shall be set near the expansion joint. The widened straight through specification shall be able to reserve enough cable expansion allowance (greater than l), and it can meet the smaller bending radius required for cable expansion. The distance b between the widened straight lines on both sides of the expansion joint can be slightly greater than the width l of the expansion joint.

当伸缩缝水平方向没有空间，又无法直通安装加宽件时，可适当移至伸缩缝两侧。当两侧各安装一个加宽直通，仍不能满足电缆伸缩量足够和弯曲半径小的要求时，可在伸缩接头两侧安装对称连接的两个加宽直通。伸缩缝两侧桥梁之间的距离B仍略大于L。

When there is no space in the horizontal direction of the expansion joint and it is impossible to install the widening piece directly, it can be moved to both sides of the expansion joint appropriately. When one widening straight through is installed on both sides, and the requirements for sufficient cable expansion and small bending radius cannot be met, two widening straight through symmetrically connected can be installed on both sides of the expansion joint. The distance b between the bridges on both sides of the expansion joint is still slightly greater than L.

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