在化工行業中，橋架的使用至關重要，它不僅承載著各種電纜，更在安全與效率方面發揮著關鍵作用。許多人在設計和施工過程中，會遇到一個常見的問題：橋架是否需要跨接？這個看似簡單的問題，實際上與設備的安全性、系統的穩定性以及運行的可靠性息息相關。Q

　　In the chemical industry, the use of cable trays is crucial. They not only carry various cables, but also play a key role in safety and efficiency. Many people encounter a common question during the design and construction process: does the bridge need to be bridged? This seemingly simple question is actually closely related to the safety of the equipment, the stability of the system, and the reliability of operation. Q

　　橋架需要跨接嗎需要，但可以通過防松螺帽或防松墊圈。當采用鍍鋅電纜橋架時，可通過防松螺帽或防松墊圈的連接來實現橋架跨接，對于不銹鋼和鋁合金材質電纜橋架，則應采用專用的接地螺栓孔進行接地跨接采購橋架時，為方便施工，建議要求廠家配套的連接片的螺栓為防松螺母，不建議采用防松墊圈。

　　Does the bridge need to be bridged? Yes, but it can be done with anti loosening nuts or washers. When using galvanized cable trays, bridge bridging can be achieved through the connection of anti loosening nuts or anti loosening washers. For stainless steel and aluminum alloy cable trays, dedicated grounding bolt holes should be used for grounding bridging. When purchasing cable trays, for the convenience of construction, it is recommended to require the bolts of the connecting pieces provided by the manufacturer to be anti loosening nuts, and it is not recommended to use anti loosening washers.

　　01規范依據

　　01 Standard Basis

　　1）SH/T 3164-2021石油化工儀表系統防雷設計規范10.2.10 金屬電纜槽板之間的連接件應采用至少兩組帶有防松墊片的鍍鋅鋼螺栓直接壓接，實現導電連接，或采用壓接鍍錫銅連接片的絕緣多股銅線跨接，銅線截面積應≥4.0mm2。

　　1) SH/T 3164-2021 Design Specification for Lightning Protection of Petrochemical Instrumentation Systems 10.2.10 The connectors between metal cable trays should be directly crimped with at least two sets of galvanized steel bolts with anti loosening gaskets to achieve conductive connection, or insulated multi strand copper wires with crimped tinned copper connectors should be used for cross connection. The cross-sectional area of the copper wire should be ≥ 4.0mm2.

　　6.5.1 接地導線應采用壓接方式；導線端應采用銅或鍍錫銅連接片壓接，所有采用壓接方式的連接點均應采用帶有防松墊片的鍍鋅鋼螺栓壓緊固定，實現導電連接。同一壓接點的壓接導線不應多于兩條。2）SH/T 3569-2020?石油化工電纜橋架施工及驗收規范8.2.3 鍍鋅電纜橋架間連接板的兩端可不作接地跨接，墊圈的連接固定螺栓。但連接板每端應不少于2個有防松螺帽或防松墊圈的連接固定螺栓。8.2.4 不銹鋼和鋁合金材質的電纜橋架連接處應使用專用的接地螺栓孔進行接地跨接，不應采用橋架連接板固定螺栓孔，跨接導線的截面積應符合設計文件要。3）GB 50169-2016?電氣裝置安裝工程接地裝置施工及驗收規范4.3.9 金屬電纜橋架的接地應符合下列規定：1 宜在電纜橋架的支吊架上焊接螺栓，和電纜橋架主體采用兩端壓接銅鼻子的銅絞線跨接，跨接線非常小截面積不應小4mm2。2 電纜橋架的鍍缽支吊架和鍍辭電纜橋架之間無跨接地線時，其間的連接處應有不少于2個帶有防松螺帽或防松墊圈的螺栓固定。

　　6.5.1 The grounding wire should be crimped; The wire ends should be crimped with copper or tin plated copper connectors, and all connection points using crimping methods should be secured with galvanized steel bolts with anti loosening washers to achieve conductive connections. There should not be more than two crimping wires at the same crimping point. 2）SH/T 3569-2020? Code for Construction and Acceptance of Cable Trays in Petrochemical Industry 8.2.3 The two ends of the connecting plate between galvanized cable trays may not be grounded, and the connection fixing bolts of the washers shall not be used. But each end of the connecting plate should have at least 2 fixing bolts with anti loosening nuts or anti loosening washers. 8.2.4 Special grounding bolt holes should be used for grounding bridging at the connection points of stainless steel and aluminum alloy cable trays. Cable tray connection plates should not be used to fix bolt holes, and the cross-sectional area of the bridging wires should comply with the design documents. 3）GB 50169-2016? Code for Construction and Acceptance of Grounding Devices in Electrical Equipment Installation Engineering 4.3.9 The grounding of metal cable trays should comply with the following regulations: 1. It is recommended to weld bolts on the supports and hangers of cable trays, and the main body of cable trays should be bridged with copper stranded wires with copper noses pressed at both ends. The minimum cross-sectional area of the jumper wire should not be less than 4mm2. When there is no grounding wire between the plating bowl support hanger of the cable tray and the plating groove cable tray, there should be no less than 2 bolts with anti loosening nuts or anti loosening washers fixed at the connection between them.

　　4）也可以參考其他規范，如GB 50303-2015?建筑電氣工程施工質量驗收規范中11.1.1金屬梯架、托盤或槽盒本體之間的連接應牢固可靠，與保護導體的連接應符合下列規定：1 梯架、托盤和槽盒全長不大于30m時，不應少于2處與保護導體可靠連接；全長大于30m時，每隔20m～30m應增加一個連接點，起始端和終點端均應可靠接地。2 非鍍鋅梯架、托盤和槽盒本體之間連接板的兩端應跨接保護聯結導體，保護聯結導體的截面積應符合設計要求。3 鍍鋅梯架、托盤和槽盒本體之間不跨接保護聯結導體時，連接板每端不應少于2個有防松螺帽或防松墊圈的連接固定螺栓。GB 55024-2022?建筑電氣與智能化通用規范8.7.1電纜橋架本體之間的連接應牢固可靠，金屬電纜橋架與保護導體的連接應符合下列規定：

　　4) Can you also refer to other specifications, such as GB 50303-2015? 11.1.1 of the Code for Acceptance of Construction Quality of Building Electrical Engineering stipulates that the connection between metal ladder frames, trays or trough boxes should be firm and reliable, and the connection with protective conductors should comply with the following regulations: 1. When the total length of ladder frames, trays and trough boxes is not more than 30m, there should be no less than 2 reliable connections with protective conductors; When the total length is greater than 30m, a connection point should be added every 20m to 30m, and both the starting and ending ends should be reliably grounded. 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. 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. GB 55024-2022? General Specification for Building Electrical and Intelligent Engineering 8.7.1 The connection between cable trays should be firm and reliable, and the connection between metal cable trays and protective conductors should comply with the following regulations:

　　1 電纜橋架全長不大于30m時，不應少于2處與保護導體可靠連接；全長大于30m時，每隔 20m～30m應增加一個連接點，起始端和終點端均應可靠接地；2 非鍍鋅電纜橋架本體之間連接板的兩端應跨接保護聯結導體，保護聯結導體的截面面積應符合設計要求；3 鍍鋅電纜橋架本體之間不跨接保護聯結導體時，連接板每端不應少于2個有防松螺帽或防松墊圈的連接固定螺栓。

　　When the total length of the cable tray 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 to 30m, and both the starting and ending ends should be reliably grounded; The two ends of the connecting plate between the non galvanized cable tray bodies should be bridged with protective connecting conductors, and the cross-sectional area of the protective connecting conductors should meet the design requirements; When the galvanized cable tray body does 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.

　　02看圖說話圖1 跨接線做法圖2 跨接線做法上述圖片的問題如下：①圖1采用的是非防松螺母，雖然采用專用接地螺栓孔，但跨接線為螺旋狀不符合規范要求（ SH/T 3081中6.2.2 接地線應盡可能短，并宜按直線路徑敷設，不應將接地線繞成螺線管狀或盤成環狀）。②圖2，如果不是防松螺母或者未采用防松墊圈，這種做法是錯誤的；如果是防松螺母或者防松墊圈，圖2跨接做法就是畫蛇添足。

　　The problem with the above picture is as follows: ① Figure 1 uses a non loosening nut, and although a dedicated grounding bolt hole is used, the jumper wire is spiral shaped, which does not meet the specification requirements (SH/T 3081 6.2.2 Grounding wire should be as short as possible and should be laid in a straight path, and should not be wound into a spiral tube or coiled into a ring shape). ② Figure 2, if it is not a lock nut or a lock washer is not used, this approach is incorrect; If it is a lock nut or lock washer, the cross connection method in Figure 2 is just adding unnecessary details.

　　注：防松螺母、自緊螺母是一種常見的緊固防松螺母。包括機械防松、鉚沖防松、摩擦防松、構造防松等。

　　Note: Anti loosening nuts and self tightening nuts are common types of fastening anti loosening nuts. Including mechanical anti loosening, riveting anti loosening, friction anti loosening, structural anti loosening, etc.

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