結合《建筑電氣工程施工質量驗收規范》和《民用建筑電氣設計規范》等現行標準及工程實踐，整理歸納的電纜橋架安裝技術和設計要點，如下：

　　Based on current standards and engineering practices such as the "Code for Acceptance of Construction Quality of Building Electrical Engineering" and the "Code for Electrical Design of Civil Buildings", the cable tray installation technology and design points are summarized as follows:

　　一、間距要求電纜橋架在穿過防火墻及防火樓板時，應采取防火隔離措施，防止火災沿線路延燃；防火隔離墻、板，應配合土建施工預留洞口，在洞口處預埋好護邊角鋼，施工時根據電纜敷設的層數和根數用L50×50×5角鋼作固定框，同時將固定柜焊在護邊角鋼上；也可以先作好框在土建施工中砌體或澆灌混凝土時安裝在墻、板中。

　　1、 The safety distance requirement is that when cable trays pass through firewalls and fire-resistant floors, fire-resistant isolation measures should be taken to prevent fires from spreading along the line; Fire isolation walls and panels should be equipped with reserved openings for civil construction, and edge protection angle steel should be pre embedded at the openings. During construction, L50 × 50 × 5 angle steel should be used as a fixed frame according to the number of layers and cables laid, and the fixed cabinet should be welded to the edge protection angle steel; Alternatively, the frame can be installed in the wall or slab during masonry or concrete pouring in civil construction.

　　注：與可燃管道交叉時凈距≥100mm；間距不足時需采用石棉板、防火隔板等隔離措施。

　　Note: When crossing with combustible pipelines, the clear distance should be ≥ 100mm; if the distance is insufficient, isolation measures such as asbestos board and fireproof partition should be used.

　　二、接地與連接規范橋架安裝選擇

　　2、 Grounding and connection specifications - Bridge installation selection

　　需屏蔽電氣干擾的電纜回路，有腐蝕的場所、易燃粉塵場所，應選用無孔封閉型托盤；在容易積灰和其它需遮蓋的環境或戶外場所，宜帶有蓋板。低壓電力電纜與控制電纜共用同一托盤或梯架時，應選用中間有隔板的托盤或梯架；在托盤、梯架分支、引上、引下處應設適當的彎通；因受空間條件限制不便裝設彎通或有特殊要求時，可選用軟連接板、鉸接板；伸縮縫應設置伸縮板；連接兩段不同寬度或高度的托盤、梯架可配置變寬或變高板。

　　Cable circuits that require shielding from electrical interference, places with corrosion, and places with flammable dust should use non porous enclosed trays; In environments or outdoor places that are prone to dust accumulation and require cover, it is advisable to have a cover plate. When low-voltage power cables and control cables share the same tray or ladder, a tray or ladder with a partition in the middle should be selected; Appropriate bends should be installed at the branching, leading up, and leading down points of pallets and ladders; When it is inconvenient to install bends due to space constraints or there are special requirements, soft connecting plates or hinged plates can be used; Expansion joints should be equipped with expansion plates; Connecting two trays or ladders of different widths or heights can be configured with variable width or height boards.

　　1.接地要求：金屬橋架及支架全長≥2處接地（與PE/PEN干線連接）。非鍍鋅橋架連接板兩端跨接≥4mm?銅芯接地線。鍍鋅橋架連接板兩端用≥2個防松螺栓固定（無需跨接線）。

　　1. Grounding requirements: Metal cable trays and supports must be grounded at least 2 points along their entire length (connected to PE/PEN main lines). Both ends of the non galvanized bridge connecting plate should be bridged with a copper core grounding wire of ≥ 4mm. The two ends of the galvanized bridge connecting plate are fixed with ≥ 2 anti loosening bolts (no need for jumper wires).

　　2.橋架選型：場景橋架類型屏蔽干擾/腐蝕環境無蓋無孔封閉托盤積灰/戶外環境帶蓋板槽式橋架電力+控制電纜共用中間帶隔板的托盤/梯架空間受限/特殊走向設軟連接板、鉸接板伸縮縫處理設伸縮板（金屬橋架每50m設20-30mm）

　　2. Cable tray selection: Recommended scenario: Cable tray type: Shielding interference/Corrosive environment without cover or hole, enclosed tray with dust accumulation/Outdoor environment with cover plate, trough type cable tray with power and control cable sharing, tray with partition in the middle, ladder rack with limited space/Special direction, flexible connection plate, hinged plate, expansion joint treatment, expansion plate (metal cable tray with 20-30mm every 50m)

　　三、安裝工藝標準

　　3、 Installation process standards

　　電纜橋架處如有防火要求的場所，應采取防火隔離措施。電纜敷設嚴禁有絞擰、鎧裝壓扁、護層斷裂和表面嚴重劃傷等缺陷。電纜橋架安裝工藝流程：定位放線→預埋鐵件或膨脹螺栓→支、吊、托架安裝→橋架安裝→保護接地安裝。

　　If there are fire prevention requirements at the cable tray location, fire isolation measures should be taken. Cable laying must strictly prohibit defects such as twisting, flattening of armor, breakage of protective layer, and severe surface scratches. Installation process of cable tray: positioning and laying out → pre embedded iron parts or expansion bolts → installation of supports, hangers, and brackets → installation of cable tray → installation of protective grounding.

　　1. 支架安裝預埋件自制加工件≥120mm×80mm×6mm，錨固圓鋼≥Φ10mm。支/吊架規格扁鋼≥30mm×3mm，角鋼≥25mm×25mm×3mm。當橋架寬度<300mm時，應在距非直線段與直線結合處300-600m的直線段側設置一個支、吊架。當橋架寬度>300mm時，在非直線段中部還應增設一個支、吊架。固定間距水平敷設1.5~3m；垂直敷設≤2m。轉彎、接線盒、變形縫兩端500mm內需增設支點。戶內支、吊短跨距一般采取1.5-3m。戶外立柱中跨距一般采取6m。多層橋架間距拉擠玻璃鋼電纜橋架多層設置時，層間中心距為200，250，300，350mm。金屬橋架直線段每隔50m應予留伸縮縫20-30mm（安裝伸縮板及跨接地線）。注：橋架與支架間螺栓、橋架連接板螺栓緊固無遺漏，螺母位于橋架外側。

　　1. The installation of bracket embedded parts and self-made processed parts should be ≥ 120mm × 80mm × 6mm, and the anchoring round steel should be ≥ Φ 10mm. The specifications of the support/hanger are flat steel ≥ 30mm × 3mm and angle steel ≥ 25mm × 25mm × 3mm. When the width of the bridge is less than 300mm, a support/hanger should be installed on the side of the straight section 300-600m away from the junction of the non-linear section and the straight section. When the width of the bridge is greater than 300mm, an additional support or hanger should be added in the middle of the non-linear section. Horizontal laying with fixed spacing of 1.5-3m; vertical laying ≤ 2m. Additional support points need to be added within 500mm at both ends of bends, junction boxes, and deformation joints. The short span for indoor support and suspension is generally 1.5-3m. The span for outdoor columns is generally 6m. When multiple layers of fiberglass cable trays are installed, the center distance between layers is 200250300350mm. Expansion joints of 20-30mm should be left every 50m for straight sections of metal trays (installation of expansion plates and grounding wires). Note: The bolts between the bridge and the bracket, as well as the bolts of the bridge connecting plate, are tightened without omission, and the nuts are located on the outside of the bridge.

　　2. 橋架敷設項目要求水平敷設支撐跨距1.5~3m；坡度≥1/100（室外進室內）垂直敷設纜線每1.5m固定一次彎曲段支撐彎曲半徑≤300mm時，距彎頭300~600mm設支點；＞300mm時彎通中部增設支點多層橋架層間距：200/250/300/350mm（玻璃鋼橋架）填充率橫斷面≤50%；吊頂內槽蓋開啟面凈空≥80mm綁扎要求水平/垂直段需綁扎；24根4對線為1束；綁扎間距≤1.5m注：當鋁合金橋架與鋼支架固定時，有相互間絕緣防電化措施腐蝕措施，一般可墊石棉墊。電纜橋架在電氣豎井內敷設，可采用角鋼固定。

　　2. The bridge laying project requires horizontal laying with a support span of 1.5~3m; for vertical laying of cables with a slope of ≥ 1/100 (outdoor to indoor), a bending section is fixed every 1.5m to support the bending radius ≤ 300mm. When the bending radius is ≤ 300mm, a fulcrum is set at a distance of 300~600mm from the elbow; When the distance between the layers of the multi-layer bridge with a pivot point added in the middle of the bend is greater than 300mm: 200/250/300/350mm (fiberglass bridge) filling rate, cross-sectional area ≤ 50%; The clear clearance of the opening surface of the groove cover in the ceiling should be ≥ 80mm, and the horizontal/vertical sections should be tied; 24 pairs of wires form one bundle; Binding spacing ≤ 1.5m Note: When the aluminum alloy bridge is fixed to the steel bracket, there are mutual insulation and corrosion prevention measures, and asbestos pads can generally be used. The cable tray is laid in the electrical shaft and can be fixed with angle steel.

　　3. 特殊節點處理伸縮節鋼橋架＞30m、鋁合金/玻璃鋼橋架＞15m時設置。跨越伸縮縫處設置補償裝置，可用帶伸縮節的橋架。防火隔離穿越防火墻/樓板時，用防火包/防火泥封堵洞口（配合L50×50×5角鋼框架）。設備交叉橋架與用電設備凈距≥0.5m；同高度平行橋架間距≥0.6m。注：敷設在豎井內和穿越不同防火區的橋架，應有防火隔離措施。

　　3. Special node processing shall be set for expansion joint steel bridge>30m and aluminum alloy/fiberglass bridge>15m. Set up compensation devices at the expansion joints, and use cable trays with expansion joints. When passing through firewalls/floors for fire isolation, seal the openings with fireproof bags/fireproof mud (in conjunction with L50 × 50 × 5 angle steel frame). The clear distance between the cross bridge of equipment and the electrical equipment is ≥ 0.5m; the distance between parallel bridge bridges at the same height is ≥ 0.6m. Note: Bridge bridges laid in vertical shafts and crossing different fire zones should have fire isolation measures.

　　四、質量驗收強制性要求

　　4、 Mandatory requirements for quality acceptance

　　(1)槽式大跨距電纜橋架由室外進入建筑物內時,橋架向外的坡度不得小于1/100。

　　(1) When the trough type large-span cable tray enters the building from the outside, the outward slope of the tray shall not be less than 1/100.

　　(2)電纜橋架與用電設備交越時,其間的凈距不小于0.5m。鋁合金橋架與鋼支架間需絕緣（如墊石棉墊；禁用石棉地區可改用陶瓷纖維墊）。

　　(2) When the cable tray intersects with electrical equipment, the clear distance between them should not be less than 0.5m. The aluminum alloy tray and steel support should be insulated (such as with asbestos pads; ceramic fiber pads can be used in areas where asbestos is prohibited).

　　(3)兩組電纜橋架在同一高度平行敷設時,其間凈距不小于0.6m。

　　(3) When two sets of cable trays are laid parallel at the same height, the clear distance between them should not be less than 0.6m.

　　(4)電纜橋架宜高出地面2.2米以上,橋架頂部距頂棚或其它障礙物不應小于0.3米,橋架寬度不宜小于0.1米。橋架內橫斷面的填充率不應超過40%，控制電纜可放寬到50%。

　　(4) The cable tray should be at least 2.2 meters above the ground, and the distance between the top of the tray and the ceiling or other obstacles should not be less than 0.3 meters. The width of the tray should not be less than 0.1 meters. The filling rate of the cross-section inside the bridge should not exceed 40%, and the control cable can be relaxed to 50%.

　　(5)電纜橋架內纜線垂直敷設時,在纜線的上端和每間隔1.5米處應固定在橋架的支架上；水平敷設時, 在纜線的首、尾、轉彎及每間隔3~5米處進行固定。

　　(5) When the cables are vertically laid in the cable tray, they should be fixed on the brackets of the tray at the upper end and every 1.5 meters; When laying horizontally, fix the cable at the beginning, end, turn, and every 3-5 meters.

　　(6)在吊頂內設置時，槽蓋開啟面應保持80毫米的垂直凈空，線槽截面利用率不應超過50%。

　　(6) When installed in the ceiling, the opening surface of the trough cover should maintain a vertical clearance of 80 millimeters, and the utilization rate of the trough section should not exceed 50%.

　　(7)布放在線槽的纜線可以不綁扎，槽內纜線應順直，盡量不交叉；纜線不應溢出線槽；在纜線進出線槽部位, 轉彎處應綁扎固定。垂直線槽布放纜線應每間隔1.5米固定在纜線支架上。

　　(7) The cables laid in the cable trough can be left unbound, and the cables inside the trough should be straight and avoid crossing as much as possible; Cables should not overflow from cable trays; At the entrance and exit of the cable tray, the turning points should be tied and fixed. The cables laid in the vertical cable tray should be fixed on the cable support every 1.5 meters.

　　(8)在水平、垂直橋架和垂直線槽中敷設線時，應對纜線進行綁扎。綁扎間距不宜大于1.5米，扣間距應均勻，松緊適度。

　　(8) When laying wires in horizontal and vertical cable trays and vertical trunking, the cables should be tied. The binding spacing should not exceed 1.5 meters, the buckle spacing should be uniform, and the tightness should be moderate.

　　(9)橋架水平敷設時，支撐間距一般為1.5-3m,垂直敷設時固定在建筑物構體上的間距宜小于2m。

　　(9) When laying the bridge horizontally, the support spacing is generally 1.5-3m, and when laying vertically, the spacing fixed on the building structure should be less than 2m.

　　(10)橋架不得出現絞擰、壓扁、護層斷裂或深度劃傷。

　　(10) The bridge frame shall not have twisting, flattening, broken protective layer or deep scratches.

　　(11)螺栓緊固無遺漏，螺母位于橋架外側。(12)接地連接可靠，導通電阻≤0.1Ω。

　　(11) The bolts are tightened without omission, and the nuts are located on the outside of the bridge. (12) The grounding connection is reliable, with a conduction resistance of ≤ 0.1 Ω.

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