關(guān)于電纜橋架接地問題應對措施：

　　Measures to address grounding issues of cable trays:

　?。?）熟悉施工設(shè)計文件中關(guān)于接地干線設(shè)置、連接位置，以及接地干線截面、跨接接地線截面選擇等內(nèi)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）接地點可在電氣預埋階段預留引出，以滿足電纜橋架的始端、末端及中間部位的接地要求。接地干線材質(zhì)、截面應符合設(shè)計要求。當設(shè)計未作要求時，可參照《驗收規(guī)范》中保護導體（PE線導體）截面的規(guī)定選擇截面。當接地干線采用型鋼（如扁鋼或圓鋼），其截面應符合設(shè)計要求或按相應電導值進行換算。（3）跨接接地線應采用銅芯軟導線或鍍錫銅編織線，不應采用單股銅芯導線，其截面應符合設(shè)計要求。當設(shè)計未作要求時，跨接線允許截面應不小于4平方毫米（銅質(zhì)）、不大于25平方毫米（銅質(zhì)）。

　　(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).

　?。?）跨接接地宜采用焊接在電纜橋架本體上的專用接地螺栓作為跨接接地線連接點，不宜采用連接板連接螺栓作為跨接接地線的連接點；若產(chǎn)品未帶有專用接地螺栓，而施工中用連接板的螺栓進行跨接接地連接時，應將跨接接地連接處的不導電涂層進行處理，以保證跨接接地線的可靠電氣連通。

　　(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.

　?。?）跨接接地可采用每節(jié)電纜橋架之間的跨接接地線進行跨接連接，也可采用沿電纜橋架全長敷設(shè)一根銅排或銅芯導線或鍍鋅型鋼（扁鋼或圓鋼）作為接地干線，每節(jié)（包括直通、彎通等等電纜橋架應少有1處與其進行可靠連接。連接處的連接螺栓應配置彈簧墊圈，保證連接緊固可靠。

　　(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.

　?。?）對于鍍鋅電纜橋架可利用其鍍鋅的連接板進行跨接，而不必采用跨接線進行跨接，但連接板的兩端應不少于2個有防松螺帽或防松墊圈的螺栓進行連接固定，避免出現(xiàn)連接松動、脫開等現(xiàn)象，保證跨接接地的可靠連接。

　　(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.

　?。?）支、托、吊架應與電纜橋架可靠連接并接地，可與沿電纜橋架全長敷設(shè)的一根銅排或銅芯導線或鍍鋅扁鋼作為PE線的接地線相連接，也可與已有接地電纜橋架進行跨接連接，如可用銅芯軟導線或鍍錫銅編織線進行跨接連接，或不少于2處用爪型螺母與電纜橋架進行連按固定，使其與電纜橋架形成可靠的電氣連通。

　　(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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