关于电缆桥架接地问题应对措施：

　　Measures to address grounding issues of cable trays:

　　（1）熟悉施工设计文件中关于接地干线设置、连接位置，以及接地干线截面、跨接接地线截面选择等内容。

　　(1) Familiar with the construction design documents regarding the setting and connection positions of grounding main lines, as well as the selection of grounding main line sections and cross grounding wire sections.

　　（2）接地点可在电气预埋阶段预留引出，以满足电缆桥架的始端、末端及中间部位的接地要求。接地干线材质、截面应符合设计要求。当设计未作要求时，可参照《验收规范》中保护导体（PE线导体）截面的规定选择截面。当接地干线采用型钢（如扁钢或圆钢），其截面应符合设计要求或按相应电导值进行换算。（3）跨接接地线应采用铜芯软导线或镀锡铜编织线，不应采用单股铜芯导线，其截面应符合设计要求。当设计未作要求时，跨接线允许截面应不小于4平方毫米（铜质）、不大于25平方毫米（铜质）。

　　(2) The grounding point can be reserved during the electrical pre embedding stage to meet the grounding requirements of the starting, ending, and middle parts of the cable tray. The material and cross-section of the grounding main line should meet the design requirements. When there are no requirements in the design, the cross-section of the protective conductor (PE wire conductor) can be selected according to the provisions of the "Acceptance Specification". When the grounding main line is made of steel (such as flat steel or round steel), its cross-section should meet the design requirements or be converted according to the corresponding conductivity value. (3) The jumper grounding wire should use copper core flexible wire or tinned copper braided wire, and should not use single stranded copper core wire. Its cross-section should meet the design requirements. When not specified in the design, the allowable cross-sectional area of the jumper wire should be no less than 4 square millimeters (copper) and no more than 25 square millimeters (copper).

　　（4）跨接接地宜采用焊接在电缆桥架本体上的专用接地螺栓作为跨接接地线连接点，不宜采用连接板连接螺栓作为跨接接地线的连接点；若产品未带有专用接地螺栓，而施工中用连接板的螺栓进行跨接接地连接时，应将跨接接地连接处的不导电涂层进行处理，以保证跨接接地线的可靠电气连通。

　　(4) Special grounding bolts welded to the cable tray body should be used as the connection point for the grounding wire, and connection plate connection bolts should not be used as the connection point for the grounding wire; If the product does not come with a dedicated grounding bolt and the bolts of the connecting plate are used for cross grounding connection during construction, the non-conductive coating at the cross grounding connection should be treated to ensure reliable electrical connection of the cross grounding wire.

　　（5）跨接接地可采用每节电缆桥架之间的跨接接地线进行跨接连接，也可采用沿电缆桥架全长敷设一根铜排或铜芯导线或镀锌型钢（扁钢或圆钢）作为接地干线，每节（包括直通、弯通等等电缆桥架应少有1处与其进行可靠连接。连接处的连接螺栓应配置弹簧垫圈，保证连接紧固可靠。

　　(5) Cross grounding can be achieved by using the grounding wire between each section of the cable tray for cross connection, or by laying a copper bar or copper core wire or galvanized steel (flat steel or round steel) along the entire length of the cable tray as the grounding main line. Each section (including straight through, bent through, etc.) of the cable tray should have at least one reliable connection with it. The connecting bolts at the connection should be equipped with spring washers to ensure a tight and reliable connection.

　　（6）对于镀锌电缆桥架可利用其镀锌的连接板进行跨接，而不必采用跨接线进行跨接，但连接板的两端应不少于2个有防松螺帽或防松垫圈的螺栓进行连接固定，避免出现连接松动、脱开等现象，保证跨接接地的可靠连接。

　　(6) For galvanized cable trays, their galvanized connecting plates can be used for bridging without the need for jumper wires. However, the two ends of the connecting plate should be fixed with at least two bolts with anti loosening nuts or washers to avoid loose or disconnected connections and ensure reliable grounding.

　　（7）支、托、吊架应与电缆桥架可靠连接并接地，可与沿电缆桥架全长敷设的一根铜排或铜芯导线或镀锌扁钢作为PE线的接地线相连接，也可与已有接地电缆桥架进行跨接连接，如可用铜芯软导线或镀锡铜编织线进行跨接连接，或不少于2处用爪型螺母与电缆桥架进行连按固定，使其与电缆桥架形成可靠的电气连通。

　　(7) Supports, brackets, and hangers should be reliably connected to cable trays and grounded. They can be connected to a copper busbar, copper core wire, or galvanized flat steel as a PE wire laid along the entire length of the cable tray, or they can be cross connected to existing grounded cable trays. For example, copper core flexible wires or tinned copper braided wires can be used for cross connection, or at least two claw nuts can be used to connect and fix the cable tray, forming a reliable electrical connection with the cable tray.

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