電纜橋架是電氣光纜的重要部分，雖然外部有絕緣層保護(hù)，但由于其導(dǎo)電性，接地是必不可少的。只有形成良好的電氣連接，才能確保其可靠。然而，金屬電纜橋架在生產(chǎn)時(shí)并未配備的接地螺栓，因此在施工時(shí)需借助連接板上的螺栓來(lái)固定跨接接地線(xiàn)。需要注意的是，電纜橋架及其連接板涂有防腐涂層，如果跨接處的防腐涂層未干凈，將影響電氣連接，增大接觸電阻，進(jìn)而影響接地線(xiàn)的可靠連接和接地質(zhì)量。

　　Cable tray is an important part of electrical optical cables. Although it is protected by an insulation layer on the outside, grounding is essential due to its conductivity. Only by forming a good electrical connection can its safety and reliability be ensured. However, metal cable trays are not equipped with professional grounding bolts during production, so it is necessary to use bolts on the connecting plate to fix the grounding wire during construction. It should be noted that the cable tray and its connecting plate are coated with anti-corrosion coating. If the anti-corrosion coating at the cross connection is not completely removed, it will affect the electrical connection, increase the contact resistance, and thus affect the reliable connection and grounding quality of the grounding wire.

　　根據(jù)《驗(yàn)收規(guī)范》的要求，電纜橋架及其支架的接地連接必須可靠，全長(zhǎng)應(yīng)少與接地（PE）干線(xiàn)相連接2處。對(duì)于非鍍鋅電纜橋架間的連接板，其兩端應(yīng)跨接銅芯接地線(xiàn)，且小允許截面不得小于4平方毫米。而對(duì)于鍍鋅電纜橋架間的連接板，其兩端可以不跨接接地線(xiàn)，但需用不少于2個(gè)帶有防松螺帽或防松墊圈的螺栓進(jìn)行固定。這些標(biāo)準(zhǔn)是接地施工的要求，施工人員在進(jìn)行操作時(shí)應(yīng)以此為依據(jù)。但是只按照限度來(lái)接地操作是完全不夠的，下面我們一起來(lái)看看在具體施工中，存在的一些接地問(wèn)題。

　　According to the requirements of the "Acceptance Specification", the grounding connection of cable trays and their supports must be reliable, and the entire length should be connected to at least 2 grounding (PE) main lines. For the connection plates between non galvanized cable trays, copper core grounding wires should be bridged at both ends, and the minimum allowable cross-section should not be less than 4 square millimeters. For the connecting plate between galvanized cable trays, the two ends may not be connected to the grounding wire, but they need to be fixed with at least 2 bolts with anti loosening nuts or washers. These standards are the minimum requirements for grounding construction, and construction personnel should use them as a basis for their operations. However, it is not enough to only follow the minimum grounding operation. Let's take a look at some grounding issues that exist in specific construction.

　　▌電纜橋架接地的幾個(gè)問(wèn)題：（1）電纜橋架全長(zhǎng)不大于30m的，應(yīng)有不少于2處與接地干線(xiàn)相連接，但施工中往往只做到1處與接地干線(xiàn)相連接，其末端應(yīng)與接地干線(xiàn)相連接的要求常常被忽視；全長(zhǎng)大于30m的，由于設(shè)計(jì)未注明電纜橋架與接地干線(xiàn)相連接的施工要求和具體連接位置，施工中通常多2處與接地干線(xiàn)相連接，未能做到每隔20~30m增加1處與接地干線(xiàn)相連接。（2）電纜橋架跨接接地線(xiàn)截面由于設(shè)計(jì)不明確，施工中往往只按規(guī)范規(guī)定的小允許截面4平方毫米（銅質(zhì)質(zhì)選擇，使其截面可能不滿(mǎn)足要求，存在接地隱患。（3）對(duì)于非鍍鋅電纜橋架，不少產(chǎn)品本體上沒(méi)有設(shè)置專(zhuān)用的接地螺栓，在施工中，往往利用連接板的螺栓，在連接板處對(duì)跨接接地線(xiàn)進(jìn)行連接固定。由于連接板涂有絕緣的防腐涂層，可能使跨接接地線(xiàn)與電纜橋架的金屬本體之間不能形成可靠的電氣連通，而此時(shí)跨接地線(xiàn)連接又是申接連接，當(dāng)出現(xiàn)連接板松動(dòng)、脫開(kāi)等現(xiàn)象時(shí)，將會(huì)造成跨接接地線(xiàn)連接不牢，甚斷開(kāi)，使得電纜橋架失去接地，存在接地隱患。（4）電纜橋架的支架接地在施工中漏接現(xiàn)象較為普遍，而電纜橋架與支架之間也沒(méi)有連接固定，使得支架沒(méi)有可靠接地。

　　Several issues regarding the grounding of cable trays: (1) For cable trays with a total length of no more than 30m, there should be at least 2 connections to the grounding main line. However, during construction, only 1 connection to the grounding main line is often achieved, and the requirement that the end should be connected to the grounding main line is often overlooked; For cables with a total length greater than 30m, due to the lack of construction requirements and specific connection locations for cable trays to be connected to the grounding main line in the design, there are usually no more than 2 connections to the grounding main line during construction, and it is not possible to add 1 connection to the grounding main line every 20-30 meters. (2) Due to unclear design, the cross-sectional area of the grounding wire for cable trays is often only allowed to be 4 square millimeters according to the minimum allowable cross-sectional area specified in the specifications during construction (copper material selection may not meet the requirements, which poses a grounding safety hazard). (3) For non galvanized cable trays, many products do not have dedicated grounding bolts on the body. During construction, the connecting plate bolts are often used to connect and fix the grounding wire at the connecting plate. Due to the insulation anti-corrosion coating on the connecting plate, reliable electrical connection may not be formed between the cross grounding wire and the metal body of the cable tray. At this time, the cross grounding wire connection is also a nominal connection. When the connecting plate is loose or disconnected, it will cause the cross grounding wire connection to be weak or even disconnected, resulting in the loss of grounding of the cable tray and posing a grounding safety hazard. (4) The grounding of cable tray supports is commonly missed during construction, and there is no connection or fixation between cable trays and supports, resulting in unreliable grounding of the supports.

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