Weak power network system is a combination of different electronic functional districts. Strong bridge and weak bridge system are indispensable in weak power network system. Cable bridge is a supporting project of wiring engineering. Distribution and weak electricity should be set separately. What is the difference between strong bridge and weak bridge? In fact, the difference between strong bridge and weak bridge is quite big. Jinan Cable Bridge Company summarizes the difference between strong bridge and weak bridge mainly in the following aspects:

1、電纜橋架本身沒有強弱電之分，是一模一樣的，你用這個橋架布強電就叫強電橋架，如果用這個橋架走弱電，就叫弱電橋架。只是使用上的分別，他們的材質，規格，顏色，安裝方式都是一樣的，在外觀上是沒有什么區別的。

1. There is no distinction between strong and weak electricity in the cable bridge itself. It is identical. If you use this bridge to lay strong electricity, it is called strong electricity bridge. If you use this bridge to walk weak electricity, it is called weak electricity bridge. Only in the use of the difference, their material, specifications, colors, installation methods are the same, there is no difference in appearance.

2、但在安裝過程中是有一定要求的，強電和弱電橋架不是多數為共用，一般設計都是分開。因為強電供電時強電電流會在電纜導線周圍形成較強磁場影響弱電信號所以要分開或者在相同橋架內設置鋼板隔板隔開。

2. But in the process of installation, there are certain requirements. Strong and weak bridge is not mostly shared, and the general design is separate. Because the strong electric current will form a strong magnetic field around the cable conductor to influence the weak electric signal when the strong electric power supply is applied, it is necessary to separate or install steel plate separators in the same bridge frame.

3、通常，弱電橋架規格要比強電橋架規格小，從材質，外觀上看是一樣的。但嚴格來說，在安裝使用橋架的時候，要把強弱電分開的，并不能放在一個橋架里。

3. Usually, the specifications of weak bridge are smaller than those of strong bridge. The material and appearance are the same. But strictly speaking, when installing and using the bridge, the strong and weak electricity should be separated and not placed in a bridge.

4、電纜橋架是是用來走電纜的，電氣里的電纜暗敷時（埋地或走樓板、墻里等）一般用鍍鋅鋼管或塑料管做保護管，但明敷的時候，一般走橋架，比如，在廠房梁下三百左右吊裝橋架，噴塑電纜橋架，在橋架上敷設電纜，這里的電纜不需要套保護管（鍍鋅鋼管或塑料管）。

4. Cable bridge is used for traveling cables. When cables are hidden in the electricity (buried or traveling in floors, walls, etc.), galvanized steel pipe or plastic pipe are usually used as protective pipe, but when they are laid in the open, they are generally travelling bridge, for example, to hoist the bridge under 300 or so factory girders, to spray plastic cable bridge, and to lay cables on the bridge. The cables here do not need a protective pipe (galvanized steel pipe or plastic). Material pipe).

5、通常有梯形橋架、槽型橋架等材質有鋼板熱鍍鋅、電鍍鋅、噴塑、玻璃鋼等。目前尚無專門的規范指導，各個生產廠家的規格形式缺乏通用性，因此，設計選型過程應根據電氣各個系統的電纜類型、數量，合理選定適用的橋架。

5. Trapezoidal bridge and trough bridge are usually made of hot-dip galvanized steel plate, galvanized steel plate, plastic spraying, FRP, etc. At present, there is no specific normative guidance, and the specifications of each manufacturer are lack of universality. Therefore, the design and selection process should be based on the type and quantity of cables in each electrical system, and the appropriate bridge should be selected reasonably.

6、纜橋架且必須符合下列規定：

6. Cable bridges must meet the following requirements:

金屬電纜橋架及其支吊架全長應不少于2處與接地干線相連接，非鍍鋅電纜橋架間連接板的兩端跨接銅芯導線或編織銅線允許截面應不小于4mm，此外，為了防止電化學腐蝕作用，在鋁合金電纜橋架上不得用裸銅導體作接地干線，鍍鋅電纜橋架間連接板的兩端可不作接地跨接線．但每塊連接板應有不少于2個有防松動螺帽或防松動墊圈的連接固定螺栓，當允許利用電纜橋架構成接地干線回路時，電纜橋架及其支、吊架、連接板應能承受接地故障電流．并滿足熱效應的要求。作為接地干線的電纜橋架．其托盤、梯架端部之間的連接電阻應不大于0．0003Ω。

The full length of the metal cable bridge and its support and suspension should not be less than 2 places connected with the earthing trunk, and the allowable cross-section of the copper core conductor braided copper wire should not be less than 4 mm at the two ends of the connecting plate between non-galvanized cable bridges. In addition, in order to prevent electrochemical corrosion, bare copper conductor should not be used as the earthing trunk on the aluminium alloy cable bridge, and the two ends of the connecting plate between galvanized cable bridges may not be used as the earthing trunk. Ground-spanning connection. However, each connecting plate shall have at least two connecting and fixing bolts with anti-loosening nuts or anti-loosening washers. When the cable bridge structure is allowed to form a grounding trunk circuit, the cable bridge frame and its branches, hangers and connecting plates shall be able to withstand grounding fault current and meet the requirements of thermal effect. The connection resistance between the end of the pallet and the ladder of the cable bridge used as the main grounding line shall not exceed 0.0003_.

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