In the construction of cable bridge, the type of cable bridge and the selection of cable piercing clamp have become a headache for us. When many people encounter this type of selection, they are often in a dilemma. They do not know how to select the type, especially for the branch of cable bridge, what kind of cable piercing clamp to use. It is even more difficult. Next, Jinan cable bridge manufacturers will give you a detailed analysis of the selection of cable piercing clamp or cable bridge in different situations!

那么针对电缆桥架施工型式选择和电缆穿刺线夹选型如何选择呢？现在我们来看看在遇到类似情况时，我们应当如何进行判断选型。在遭遇电缆桥架型式选择时，需要电气屏蔽或防止油、液体、易燃粉尘等外部污染时，采用有盖无孔的托盘。装配式托盘及电缆穿刺线夹可以现场装配，不受施工场地限制，又有产品成品率高等优点，特别适合于施工场地较狭小的场所。运输方便，大大减少体积和运输成本。但由于装配部件较多，装配后须妥善做好跨接和接地。

So how to choose the construction type of cable bridge and cable piercing clamp? Now let's take a look at how we should judge and choose when we meet similar situations. When encountering the choice of cable bridge type, the tray with cover and without hole is used to shield or prevent external pollution such as oil, liquid and combustible dust. The assembled tray and cable piercing clamp can be assembled on site, which is not limited by the construction site, and has the advantages of high product yield. It is especially suitable for the narrow construction site. Convenient transportation, greatly reducing the volume and transportation costs. However, due to the large number of assembly parts, it is necessary to do a good job of crossover and grounding after assembly.

除上述以外，可采用有孔托盘及电缆穿刺线夹。在民用建筑的电气竖井中，通常采用电缆穿刺线夹;在建筑吊顶内，国内规范要求采用封闭槽盒，认为吊顶内不允许有可燃物质，认为应区别对待可燃物体积与吊顶空间比例。因电缆占空间极有限，应参照相应的标准。标准可采用有孔托盘及电缆穿刺线夹。在多尘环境或户外需要遮荫的场所，宜采用带盖板的托盘。公共通道或户外跨越道路段，下层梯架底部宜加护板或采用托盘。

In addition to the above, a perforated tray and a cable puncture clamp can be used. In the electric shafts of civil buildings, cable puncture clamps are usually used; in the ceiling of buildings, the domestic codes require the use of closed groove boxes. It is considered that combustible substances are not allowed in the ceiling, and that the volume ratio of combustible substances to the ceiling space should be treated differently. Due to the limited space occupied by cables, the corresponding international standards should be consulted. The international standard can adopt perforated tray and cable puncture clamp. In dusty environment or outdoor places where shade is needed, pallets with cover plates should be used. Public passageway or outdoor crossing road section, the bottom of the lower ladder should be protected by plate or pallet.

要求电缆穿刺线夹防火时，按照有关设计规范可采取下列措施之一:

When the cable puncture clamp is required to be fireproof, one of the following measures may be taken in accordance with the relevant design specifications:

1)采用耐火电缆槽盒或防火阻燃电缆穿刺线夹，执行标准《1GB294152013《《耐火电缆槽盒》。

1) Using fire-resistant cable groove box or fire-retardant cable puncture clamp, the implementation of the standard "1GB294152013" fire-resistant cable groove box.

2)采用普通钢制有盖托盘，并在其内部加封闭的耐火或难燃隔热板，外表面涂刷不小于0.5mm厚的防火膨胀涂料。个人认为实际这两种方法都达不到要求。若采用隔热板衬垫，则正常运行时电缆散热不利;若在钢制电缆桥架表面涂防火涂料，由于镀层与桥架不构成锚地结构，附着力较差，且当火焰温度达450℃以上时，镀锌层融化，锌层连同防火涂料整体脱落。因此，确实需要电缆耐火的场所，应采用耐火电缆。

2) Use common steel covered pallet with closed fire-resistant or flame-retardant heat insulation board inside, and coat the outer surface with fire-retardant expansion paint not less than 0.5mm thick. Personally, I think that neither of these methods can meet the requirements in practice. If the insulating plate is used, the heat dissipation of the cable will be disadvantageous in normal operation; if the fire-proof coating is applied on the surface of the steel cable bridge, the coating and the bridge frame do not constitute anchorage structure, and the adhesion is poor. When the flame temperature reaches above 450 C, the galvanized layer melts and the galvanized layer together with the fire-proof coating will fall off as a whole. Therefore, fire-resistant cables should be used in places where fire resistance of cables is really needed.

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