電纜橋架的接地：

　　Grounding of cable tray:

　　電纜橋架包括電纜槽盒、電纜托盤、電纜梯架，不管是否能觸及到都必須接地。接地除了在始、終端與PE線相連接外，本身之間還需要跨接。

　　Cable trays include cable tray boxes, cable trays, and cable ladders, which must be grounded regardless of whether they are accessible or not. In addition to being connected to the PE line at the beginning and end, grounding also requires cross connection between itself.

　　1、鍍鋅電纜槽盒因為鋅是良導體，且不易氧化，而且橋架的連接板也是做鍍鋅處理的，因此橋架可直接利用連接板作為跨接板。為了使跨接可靠，連接板每一端應(yīng)由不少于2個防松螺帽或防松墊圈的螺栓固定。電纜槽盒若是安裝在振動場所，每只螺栓均應(yīng)加裝彈簧墊圈。

　　1. Galvanized cable trays can be directly used as jumper plates because zinc is a good conductor and not easily oxidized, and the connecting plates of the cable tray are also galvanized. In order to ensure reliable cross connection, each end of the connecting plate should be fixed with bolts containing no less than 2 anti loosening nuts or anti loosening washers. If the cable tray is installed in a vibrating area, each bolt should be equipped with a spring washer.

　　2、噴漆或噴塑電纜槽盒的涂層是絕緣物，因此槽盒之間必須跨接，電纜橋架連接部位宜采用兩端壓接鍍錫銅鼻子的銅絞線跨接，跨接線的小截面積不小于4mm2。電纜槽盒兩端若焊鐵質(zhì)螺栓，容易生銹增加接觸電阻。為了避免此缺點，應(yīng)在電纜槽盒兩端焊銅質(zhì)螺栓或在電纜槽上打洞后焊銅質(zhì)螺母，這樣做跨接更加可靠。

　　2. The coating of painted or spray painted cable trays is insulation material, so the trays must be bridged between them. The connection part of the cable tray should be bridged with copper stranded wires with tin plated copper noses pressed at both ends, and the minimum cross-sectional area of the jumper wire should not be less than 4mm2. If iron bolts are welded at both ends of the cable tray box, it is easy to rust and increase contact resistance. To avoid this drawback, copper bolts should be welded at both ends of the cable tray box or copper nuts should be welded after drilling holes in the cable tray, which makes the jumper more reliable.

　　3、塑料橋架或玻璃鋼橋架的外殼不必接地。

　　3. The shell of plastic bridge or fiberglass bridge does not need to be grounded.

　　4、沿電纜橋架敷設(shè)的銅絞線、鍍鋅扁鋼及利用橋架構(gòu)成電氣通路的金屬構(gòu)件，如安裝托架用的金屬構(gòu)件作為接地干線，電纜橋架全長不大于30m時，應(yīng)有不少于2處與接地干線相連；全長大于30m時，每隔20~30m增加與接地干線的連接點。電纜橋架的始、終端均應(yīng)與接地網(wǎng)做可靠連接。

　　4. Copper stranded wires, galvanized flat steel, and metal components that use cable trays to form electrical pathways, such as metal components used for installing brackets as grounding main lines, should be connected to the grounding main line at least twice when the total length of the cable tray is not more than 30m; When the total length is greater than 30m, add connection points to the grounding main line every 20-30 meters. The beginning and end of the cable tray should be reliably connected to the grounding grid.

　　? 母線槽的接地：

　　What? Grounding of bus duct:

　　1、母線槽是將母線用絕緣材料支撐和隔開，且裝于一個管道或類似外殼中的電氣裝置。母線槽的外殼通常有鋁合金、薄鋼板和塑料三種。

　　1. Bus duct is an electrical device that supports and separates busbars with insulating materials and is installed in a pipeline or similar enclosure. The shell of bus duct usually comes in three types: aluminum alloy, thin steel plate, and plastic.

　　2、母線槽連接后的始、終端必須有接地端子，接地端子處應(yīng)有接志。金屬外殼的母線槽，外殼必須與PE線相連，連接處的接觸面建議做鍍鋅處理，使得母線槽外殼接地更可靠。

　　2. The starting and ending points of the bus duct connection must have grounding terminals, and there should be grounding signs at the grounding terminals. The bus duct with a metal shell must be connected to the PE wire, and it is recommended to galvanized the contact surface at the connection to make the grounding of the bus duct shell more reliable.

　　3、鋁合金外殼的母線槽，每段母線槽間不必跨接；外殼搭接面已做鍍鋅處理的母線槽也不必跨接；噴塑外殼的母線槽，在外殼搭接面未做鍍鋅處理時，每段母線槽間應(yīng)作跨接，跨接線用不小于16mm2的編織銅線，為此每段母線槽外殼的兩端都必須有接地端子。

　　3. The busbar trunking with aluminum alloy shell does not require cross connection between each section of busbar trunking; Bus ducts with galvanized overlapping surfaces on the outer shell do not need to be bridged; When the bus duct with a spray painted shell is not galvanized on the overlapping surface of the shell, each section of the bus duct should be connected by a jumper wire made of braided copper wire not less than 16mm2. Therefore, both ends of each section of the bus duct shell must have grounding terminals.

　　4、薄鋼板外殼的母線槽一般由四塊鋼板組成，相互之間用螺栓連成一體，每個螺栓有兩只帶刺墊圈，能同時刺穿上、下兩塊鋼板的絕緣涂層，使鋼板之間連通。穿心螺栓接地必須可靠，接地端子應(yīng)焊在直接與絕緣母線相接觸的一塊鋼板的兩端，并采用鍍鋅帶齒鎖緊墊圈。母線槽上任何一處未涂漆點與接地端子間的電阻不得大于0.1Ω。

　　4. The bus duct of the thin steel plate shell is generally composed of four steel plates, which are connected to each other by bolts. Each bolt has two piercing washers, which can pierce the insulation coating of the upper and lower steel plates at the same time, so that the steel plates are connected. The grounding of the through bolt must be reliable, and the grounding terminal should be welded to both ends of a steel plate in direct contact with the insulated busbar, and a galvanized toothed locking washer should be used. The resistance between any unpainted point on the bus duct and the grounding terminal shall not exceed 0.1 Ω.

　　5、母線槽的固定支架也應(yīng)接地。對平時不易碰到的支架可不接地，但必須保證讓母線槽外殼接地可靠。

　　5. The fixed bracket of the bus duct should also be grounded. For brackets that are not easily touched during normal times, grounding is not necessary, but it is necessary to ensure reliable grounding of the bus duct casing.

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