桥架就是专门用来托着和管理电缆、电线还有光纤的一个东西。在工厂啊、啊，还有各种建筑里面，都能看到它的身影，主要就是为了让那些电缆的走线看起来整整齐齐的，看着舒服，而且还特别。说到这可能有人就想问了，桥架一般不都是铁做的嘛，为啥还得弄个跨接地线呢？接下来就给大家好好说道说道。

　　A cable tray is a device specifically designed to support and manage cables, wires, and optical fibers. It can be seen in factories, shopping malls, and various buildings, mainly to make the cable routing look neat, comfortable, and especially safe. When it comes to this, some people may want to ask, aren't cable trays usually made of iron? Why do we need to install a grounding wire? Next, I will explain it to everyone in detail.

　　一、金属桥架自身接地的局限性分析

　　1、 Analysis of the Limitations of Grounding for Metal Bridge Structures

　　1. 接触电阻不可控

　　1. Uncontrollable contact resistance

　　桥架由多段拼接而成，连接处可能因油漆、氧化层、安装间隙导致接触不良，形成高电阻（即使肉眼看似紧密）。

　　The bridge frame is composed of multiple sections spliced together, and the connection may have poor contact due to paint, oxide layer, and installation gaps, resulting in high resistance (even if it appears tight to the naked eye).

　　例如：两段桥架用螺栓固定，若接触面有锈蚀，实际导电能力可能不足。

　　For example, if two bridge sections are fixed with bolts and the contact surface is corroded, the actual conductivity may be insufficient.

　　2. 动态风险

　　2. Dynamic risk

　　桥架长期使用后可能因震动、温差变形导致连接松动，破坏原有的电气通路。

　　After long-term use, the bridge frame may become loose due to vibration and temperature difference deformation, which can damage the original electrical circuit.

　　二、跨接地线的作用

　　2、 The function of cross grounding wire

　　1. 强制建立低阻抗通路

　　1. Mandatory establishment of low impedance path

　　通过铜编织带或镀锌扁钢跨接桥架各段，人为制造一条电阻≤0.1Ω的可靠路径，确保漏电、静电、雷击电流能迅速导入接地网。

　　By using copper braided tape or galvanized flat steel to bridge each section of the bridge, a reliable path with a resistance of ≤ 0.1 Ω is artificially created to ensure that leakage, static electricity, and lightning currents can be quickly introduced into the grounding grid.

　　2. 防范“断链”风险

　　2. Prevent the risk of "chain breakage"

　　即使某段桥架连接失效（如螺栓脱落），跨接地线仍能维持整体导电连续性，避免局部电位抬升引发触电或电火花。

　　Even if a certain section of the bridge connection fails (such as bolt detachment), the grounding wire can still maintain overall conductivity continuity, avoiding local potential rise and causing electric shock or sparks.

　　三、针对不同材质的独特处理方式

　　3、 Unique processing methods for different materials

　　四、遵循GB 50303标准的施工规范要求

　　4、 Follow the construction specifications requirements of GB 50303 standard

　　1.跨接位置

　　1. Crossover position

　　每段桥架连接处（含转弯、分支处）必须跨接。

　　Each section of the bridge connection (including bends and branches) must be bridged.

　　长直线段每隔30m增设一次跨接。

　　Add a crossover every 30 meters in the long straight section.

　　2. 材料选择

　　2. Material selection

　　优先使用铜质软连接（截面积≥4mm?），耐弯曲且导电性。

　　Priority should be given to using copper soft connections (cross-sectional area ≥ 4mm?), which are resistant to bending and have the best conductivity.

　　若用镀锌扁钢，截面积需≥25mm?，焊接后做防腐处理。

　　If galvanized flat steel is used, the cross-sectional area should be ≥ 25mm ?, and anti-corrosion treatment should be carried out after welding.

　　五、实际中应用

　　5、 Practical application

　　案例1：某工厂因未跨接地线，桥架连接处氧化导致接地电阻超标，设备外壳漏电时引发火灾。

　　Case 1: A factory caused a fire when the grounding resistance exceeded the standard due to oxidation at the bridge connection caused by the failure to cross the grounding wire, resulting in electrical leakage from the equipment casing.

　　案例2：数据中心采用铜编织带跨接，雷击时桥架电位被强制拉平，保护了内部光缆免受电磁脉冲损坏。

　　Case 2: The data center uses copper braided tape for bridging, which forcibly flattens the bridge potential during lightning strikes, protecting the internal optical cables from electromagnetic pulse damage.

　　总结

　　Summary

　　跨接地线本质是“冗余设计”——用明确的低阻抗通路弥补金属结构连接的不可靠性。这不仅是规范要求，更是对人身和设备的底线保障。下次看到桥架上的铜辫子，可以理解为电气工程师在说：“别指望金属自己导电，我亲自给你焊条保命通道！

　　The essence of cross grounding wire is "redundant safety design" - using clear low impedance paths to compensate for the unreliability of metal structure connections. This is not only a regulatory requirement, but also a bottom line guarantee for personal and equipment safety. The next time you see copper braids on the bridge, it can be understood as an electrical engineer saying, 'Don't expect the metal to conduct electricity on its own, I will personally provide you with welding rods to protect the passage!'!

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　　This article is a friendly contribution from Jinan Cable Bridge For more related knowledge, please click http://www.sdhangfeng.com/ Sincere attitude To provide you with comprehensive services We will gradually contribute more relevant knowledge to everyone Coming soon.