11 梯架、托盘和槽盒安装11.1 主控项目（强制条文，必须严格执行）11.1.1金属梯架、托盘或槽盒本体之间的连接应牢固可靠，与保护导体的连接应符合下列规定:1、梯架、托盘和槽盒全长不大于30m时，不应少于2处与保护导体可靠连接;全长大于30m时，每隔20m~30m应增加一个连接点。起始端和终点端均应可靠接地。2、非镀锌梯架、托盘和槽盒本体之间连接板的两端应跨接保护联结导体，保护联结导体的截面积应符合设计要求。3、镀锌梯架、托盘和槽盒本体之间不跨接保护联结导体时，连接板每端不应少于2个有防松螺帽或防松垫圈的连接固定螺栓。《T/CECS 31-2017 钢制电缆桥架工程技术规程》4.8接 地4.8.1 钢制电缆桥架系统的起始端和终端应与建筑物接地装置可靠连接，全长大于30m时，每隔20m?30m应增加一个接地连接点。4.8.2 在伸缩缝或连续铰链连接处应采用铜软导线或编织铜线连接，其截面积不应小于16mm2。

　　11 Installation of Ladders, Trays, and Troughs 11.1 Main Control Items (Mandatory Provisions, Must be Strictly Implemented) 11.1.1 The connection between metal ladders, trays, or trough boxes should be firm and reliable, and the connection with the protective conductor should comply with the following regulations: 1. When the total length of the ladder, tray, and trough box is not more than 30m, there should be no less than 2 reliable connections with the protective conductor; When the total length is greater than 30m, a connection point should be added every 20m~30m. Both the starting and ending ends should be reliably grounded. 2. The two ends of the connecting plate between the non galvanized ladder frame, tray, and trough box body should be bridged with protective connecting conductors, and the cross-sectional area of the protective connecting conductors should meet the design requirements. 3. When the galvanized ladder frame, tray, and trough box body do not cross connect the protective connecting conductor, there should be no less than 2 connection fixing bolts with anti loosening nuts or anti loosening washers at each end of the connecting plate. 4.8 Grounding 4.8.1 The starting and ending points of the steel cable tray system should be reliably connected to the building grounding device. When the total length is greater than 30m, an additional grounding connection point should be added every 20m × 30m. 4.8.2 Copper flexible wires or braided copper wires should be used at expansion joints or continuous hinge connections, with a cross-sectional area of not less than 16mm2.

　　4.8.3 钢制电缆桥架在岀入建筑物时，应就近与总等电位接地装置进行联结。GB50169-2016《 电气装置安装工程接地装置施工及验收规范?》3.0.4??电气装置的下列金属部分，均必须接地：(强制条文，必须严格执行)7??电缆桥架、支架和井架。GB51348-2019《民用建筑电气设计标准》8.5??电缆桥架布线8.5.18??金属电缆桥架应与保护联结导体可靠连接，且全长不应少于2处接地。高分子合金电缆桥架、玻璃钢桥架可不接地。GB50606-2010 《 智能建筑工程施工规范?》13.2??设备安.2.1??桥架、管线敷设除应执行现行标准《火灾自动报警系统施工及验收规范》GB?50166—2007第3.2节的规定和本规范第4章的规定外，尚应符合下列规定：3??桥架、金属线管应作保护接地。

　　4.8.3 When steel cable trays enter or exit buildings, they should be connected to the nearest main equipotential grounding device. GB50169-2016 Code for Construction and Acceptance of Grounding Devices in Electrical Equipment Installation Engineering? 》3.0.4?? The following metal parts of electrical devices must be grounded: (mandatory provisions must be strictly enforced) 7?? Cable trays, brackets, and derricks. GB51348-2019 "Electrical Design Standard for Civil Buildings" 8.5?? Cable tray wiring 8.5.18?? The metal cable tray should be reliably connected to the protective bonding conductor, and the total length should not be less than 2 grounding points. Polymer alloy cable trays and fiberglass cable trays may not be grounded. GB50606-2010 "Code for Construction of Intelligent Building Engineering"? 》13.2?? Equipment installation 13.2.1?? In addition to complying with the provisions of Section 3.2 of the current national standard "Code for Construction and Acceptance of Automatic Fire Alarm Systems" GB 50166-2007 and the provisions of Chapter 4 of this specification, the laying of cable trays and pipelines should also comply with the following regulations: 3?? Cable trays and metal conduits should be protected by grounding.

　　4.5??质量控制4.5.1??主控项目应符合下列规定：4??桥架、线管及接线盒应可靠接地；当采用联合接地时，接地电阻不应大于1Ω。GB50168-2018《 电气装置安装工程电缆线路施工及验收标准?》

　　4.5?? Quality Control 4.5.1?? The main control project should comply with the following regulations: 4?? Cable trays, conduits, and junction boxes should be reliably grounded; When using joint grounding, the grounding resistance should not exceed 1 Ω. GB50168-2018 "Construction and Acceptance Standards for Cable Lines in Electrical Equipment Installation Engineering"?

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　　5.2电缆支架的配制与安装5.2.10??本条文为强制性条文，必须严格执行。为避免电缆发生故障时危及人身，金属电缆支架、桥架、电缆竖井均必须可靠接地，较长时还应根据设计进行多点接地。根据上面的标准相关条文,可将电缆桥架接地的要求总结如下:1、钢制电缆桥架的起始端和终端必须与建筑物的接地装置可靠连接。2、当钢制电缆桥架全长大于30m时,每隔20~30m应设置一个接地连接点。3、在伸缩缝或连续铰链连接处,应使用小截面积为16mm2的铜软导线或编织铜线连接。4、钢制电缆桥架应与保护联结导体可靠连接,全长不应少于2处接地。5、高分子合金电缆桥架、玻璃钢桥架可以不接地。6、为避免电缆故障时危及人身,钢制电缆桥架必须进行可靠接地,长距离桥架还应进行多点接地。7、接地电阻不应大于1Ω。电缆桥架需要接地的主要原因是为了确保和可靠的电力传输。接地系统在电缆桥架中具有以下几个重要作用：1、保护：接地系统能够将电缆桥架上的电荷或电流通过接地导体释放到地面，避免触电事故的发生。2、防止电磁干扰：电缆桥架可能会经过电力设备或其他电磁干扰源附近。在这种情况下，没有接地的电缆桥架可能会成为电磁干扰的传导路径，导致电缆信号的干扰和失真。通过接地，可以将干扰电流引导到地下，减少对电缆信号的干扰，确保信号传输的可靠性。3、静电控制：当电缆桥架经过干燥的环境或有静电积聚的情况下，没有接地的电缆桥架可能会产生静电放电。这些静电放电可能对敏感设备或人员造成损害。通过接地，可以有效地将静电放电到地下，降低静电对设备和人员的影响。4、电磁兼容性：电缆桥架作为电力和通信线缆的承载结构，其电磁辐射和敏感性对于其他设备和系统的正常运行可能具有影响。通过接地，可以减少电缆桥架本身的电磁辐射，并提高其与其他设备之间的电磁兼容性。总而言之，接地是为了确保电缆桥架的运行，减少触电风险，保护设备和人员免受电气故障、电磁干扰和静电等不良影响。一般情况下,电缆桥架都需要接地,只有在特殊情况下可以考虑不进行接地:

　　5.2 Configuration and installation of cable supports 5.2.10?? This provision is mandatory and must be strictly enforced. To avoid endangering personal safety in case of cable failure, metal cable supports, cable trays, and cable shafts must be reliably grounded, and multiple grounding points should be carried out according to the design for longer periods of time. According to the relevant provisions of the national standards above, the requirements for grounding cable trays can be summarized as follows: 1. The starting and ending ends of steel cable trays must be reliably connected to the grounding device of the building. 2. When the total length of the steel cable tray is greater than 30m, a grounding connection point should be set every 20-30m. 3. At expansion joints or continuous hinge connections, copper flexible wires or braided copper wires with a minimum cross-sectional area of 16mm2 should be used for connection. 4. The steel cable tray should be reliably connected to the protective bonding conductor, and the total length should not be less than 2 grounding points. 5. Polymer alloy cable trays and fiberglass cable trays may not be grounded. 6. To avoid endangering personal safety in case of cable failure, steel cable trays must be reliably grounded, and long-distance trays should also be grounded at multiple points. 7. The grounding resistance should not exceed 1 Ω. The main reason why cable trays need to be grounded is to ensure safe and reliable power transmission. The grounding system plays several important roles in cable trays: 1. Safety protection: The grounding system can release the charge or current on the cable tray to the ground through the grounding conductor, avoiding the occurrence of electric shock accidents. 2. Preventing electromagnetic interference: Cable trays may pass near electrical equipment or other sources of electromagnetic interference. In this case, ungrounded cable trays may become a conductive path for electromagnetic interference, leading to interference and distortion of cable signals. By grounding, interference currents can be guided underground, reducing interference with cable signals and ensuring the reliability of signal transmission. 3. Static control: When cable trays pass through dry environments or accumulate static electricity, ungrounded cable trays may generate static discharge. These electrostatic discharges may cause damage to sensitive equipment or personnel. By grounding, static electricity can be effectively discharged underground, reducing the impact of static electricity on equipment and personnel. 4. Electromagnetic compatibility: As the load-bearing structure of power and communication cables, the electromagnetic radiation and sensitivity of cable trays may have an impact on the normal operation of other equipment and systems. By grounding, the electromagnetic radiation of the cable tray itself can be reduced, and its electromagnetic compatibility with other equipment can be improved. In summary, grounding is to ensure the safe operation of cable trays, reduce the risk of electric shock, and protect equipment and personnel from adverse effects such as electrical faults, electromagnetic interference, and static electricity. In general, cable trays need to be grounded, and only in special circumstances can grounding be considered:

　　1. 桥架为完全的绝缘材质制作如果电缆桥架的主体和其它零部件均采用绝缘材料制作,如玻璃钢、塑料、高分子材料等,确保其绝缘性能良好,可以考虑不接地。

　　1. The cable tray is made of completely insulated material. If the main body and other components of the cable tray are made of insulated materials such as fiberglass, plastic, polymer materials, etc., to ensure good insulation performance, it can be considered not to be grounded.

　　2. 桥架处于性断电状态如果电缆桥架所在的供电系统长期处于断电状态,不会有电压通过,也可以考虑暂时不接地。

　　2. The cable tray is in a permanent power-off state. If the power supply system where the cable tray is located is in a power-off state for a long time and there will be no voltage passing through, it is also possible to consider temporarily not grounding.

　　3. 桥架短时用于低压设备如果电缆桥架仅用于临时支撑一些低压的照明电缆等,使用时间很短,也可以考虑不接地。

　　3. Short term use of cable trays for low-voltage equipment. If the cable tray is only used to temporarily support some low-voltage lighting cables and has a short usage time, it can also be considered not to be grounded.

　　4. 桥架处于完全隔离环境如果电缆桥架及电缆系统完全处于一个封闭的隔离环境,与其它系统绝缘,也可以考虑不接地。5. 根据电磁兼容要求在一些对电磁干扰要求极高的场所,接地可能对信号产生影响,可以考虑不接地。除上述特殊情况外,大多数电缆桥架都需要按规范要求进行可靠的接地,这是的基本保障。不接地可能存在隐患。

　　4. The cable tray is in a completely isolated environment. If the cable tray and cable system are completely in a closed isolated environment and insulated from other systems, it is also possible to consider not grounding. 5. According to electromagnetic compatibility requirements, in some places with extremely high requirements for electromagnetic interference, grounding may have an impact on the signal, and it is possible to consider not grounding. Except for the special circumstances mentioned above, most cable trays require reliable grounding according to regulatory requirements, which is the basic guarantee of safety. Not grounding may pose a safety hazard.

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