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!

那么針對電纜橋架施工型式選擇和電纜穿刺線夾選型如何選擇呢？現在我們來看看在遇到類似情況時，我們應當如何進行判斷選型。在遭遇電纜橋架型式選擇時，需要電氣屏蔽或防止油、液體、易燃粉塵等外部污染時，采用有蓋無孔的托盤。裝配式托盤及電纜穿刺線夾可以現場裝配，不受施工場地限制，又有產品成品率高等優點，特別適合于施工場地較狹小的場所。運輸方便，大大減少體積和運輸成本。但由于裝配部件較多，裝配后須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，可采用有孔托盤及電纜穿刺線夾。在民用建筑的電氣豎井中，通常采用電纜穿刺線夾;在建筑吊頂內，國內規范要求采用封閉槽盒，認為吊頂內不允許有可燃物質，認為應區別對待可燃物體積與吊頂空間比例。因電纜占空間極有限，應參照相應的標準。標準可采用有孔托盤及電纜穿刺線夾。在多塵環境或戶外需要遮蔭的場所，宜采用帶蓋板的托盤。公共通道或戶外跨越道路段，下層梯架底部宜加護板或采用托盤。

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.

要求電纜穿刺線夾防火時，按照有關設計規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)采用耐火電纜槽盒或防火阻燃電纜穿刺線夾，執行標準《1GB294152013《《耐火電纜槽盒》。

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)采用普通鋼制有蓋托盤，并在其內部加封閉的耐火或難燃隔熱板，外表面涂刷不小于0.5mm厚的防火膨脹涂料。個人認為實際這兩種方法都達不到要求。若采用隔熱板襯墊，則正常運行時電纜散熱不利;若在鋼制電纜橋架表面涂防火涂料，由于鍍層與橋架不構成錨地結構，附著力較差，且當火焰溫度達450℃以上時，鍍鋅層融化，鋅層連同防火涂料整體脫落。因此，確實需要電纜耐火的場所，應采用耐火電纜。

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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