When selecting the type and type of cable tray, it is necessary to shield the cable network from electrical disturbances or to protect against external influences (such as corrosive liquids, flammable dust, etc.), the FB type slot type composite anti-corrosion shielding cable tray (with cover) should be selected. For strong corrosive environments, the F type composite epoxy resin anti-corrosion flame-retardant cable tray should be selected. Brackets and brackets should also use the same materials to improve the service life of cable trays and accessories.

在簡單積灰和其它需隱瞞的環(huán)境或野外場所宜加蓋板。除上述情況外，可根據(jù)現(xiàn)場還環(huán)境及技能要求選用托盤式、槽式、梯級式、玻璃防腐阻燃電纜橋架或鋼質普通型橋架。在簡單積灰和其它需隱瞞的環(huán)境或野外場所宜加蓋板。在公共通道或野外跨過道路段，底層梯級的底部宜加墊板或在該段使用托盤 。大跨距跨過公共通道時，可根據(jù)用戶要求提高橋架的載荷能力或選用行架。大跨距（>3m）要選用復合型橋架（FB）。野外要選用復合環(huán)氧樹脂橋架（F）。

Cover plates should be added in simple dust accumulation and other environments or outdoor areas that need to be concealed. In addition to the above situations, tray type, trough type, stepped type, glass anti-corrosion flame-retardant cable tray or steel ordinary type tray can be selected according to the on-site environment and skill requirements. Cover plates should be added in simple dust accumulation and other environments or outdoor areas that need to be concealed. In public passages or outdoor crossing sections, it is advisable to add a pad at the bottom of the bottom step or use a pallet at that section. When crossing a public passage with a large span, the load capacity of the bridge can be increased or a gantry can be selected according to user requirements. Composite cable trays (FB) should be used for large spans (>3m). Composite epoxy resin bridge (F) should be selected for outdoor use.

標準挑選橋架的寬度和高度就按下表挑選，并應契合電纜填充率不超越有關標準規(guī)范的規(guī)定值，動力電纜可取40-50%，控制電纜可取50-70%，別的需預留10-25%的式程開展余量。各種彎通及附件標準應契合工程安置條件并與橋架相配套。支、吊架標準的挑選，應按橋架標準、層數(shù)、跨距等條件配置。

The width and height of the standard selection cable tray should be selected according to the following table, and the cable filling rate should not exceed the specified values of relevant standards and specifications. The power cable can be taken as 40-50%, the control cable can be taken as 50-70%, and a margin of 10-25% should be reserved for other types of cable development. The standards for various bends and accessories should meet the engineering placement conditions and be matched with the bridge. The selection of support and hanger standards should be based on conditions such as bridge standards, number of floors, and span.

并應滿意荷載的要求。橋架橫截面積的挑選見支、吊架的配戶內支、吊短跨距一般采取1.5-3m。野外立柱中跨距一般采取6m非直線段的支、吊架配置就遵循以下準則。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，除契合下述條件外，在非直線段中部還應增設一個支、吊架。橋架多層設置時層間中心距為200，250，300，350mm。橋架直線段每隔50m應予留伸縮縫20-30mm（金屬橋架）。防火要求橋架防火的區(qū)段，有必要選用鋼制或不燃、阻燃資料。我公司出產的BJⅢ系列電纜橋架均為防火橋架。

And it should meet the requirements of the load. The selection of the cross-sectional area of the bridge can be seen in the matching of indoor supports and hangers. The short span of supports and hangers is generally 1.5-3m. The span of outdoor columns generally adopts the support and hanger configuration of 6m non linear sections, following the following guidelines. When the width of the bridge is less than 300mm, a support and hanger should be installed on the side of the straight section 300-600m away from the junction of the non straight section and the straight line. When the width of the bridge is greater than 300mm, in addition to meeting the following conditions, a support and hanger should also be added in the middle of the non linear section. The Centre-to-centre distance between layers is 200250300350mm when the cable tray is set in multiple layers. 20-30mm Expansion joint (metal bridge) shall be reserved every 50m in the straight section of the bridge. It is necessary to use steel or non combustible and flame retardant materials for the fire protection requirements of the bridge section. The BJ III series cable trays produced by our company are all fireproof trays.

橋架體系應具有牢靠的電氣銜接并接地（只對金屬橋架。當允許使用橋架體系構成接地干線回路時應契合下列要求。橋架端部之間銜接電阻應不大于0.00033歐姆，接地孔應絕緣涂層。在1KV及以下中性點直接接地體系中，受電設備的接地與體系中性線接地相連。裝有處動堵截供電裝軒時，橋架的級長方向金屬橫截面積應不小于規(guī)定值。沿橋架全長另敷設接地干線時，每段（包括非直線段）橋架應少有一點與接地干線牢靠銜接。對于振蕩場所，在接地部位的銜接處應設備彈簧圈。橋架體系規(guī)劃內容橋架體系工程規(guī)劃應與土建、工藝以及有關密切相配合以確定佳安置，其規(guī)劃內容可含有：橋架體系的有關剖面圖。橋架體系的平面安置圖。

The bridge system should have reliable electrical connection and grounding (For metal cable trays only. When a cable tray system is allowed to form a grounding main circuit, the following requirements should be met. The connection resistance between the cable tray ends should not exceed 0.00033 ohms, and the grounding hole should be cleaned of insulation coating. In a 1KV and below neutral point direct grounding system, the grounding of the receiving equipment is connected to the neutral line grounding of the system. When a dynamic blocking power supply device is installed, the cross-sectional area of the metal in the longitudinal direction of the cable tray should not be less than the specified value.) When laying another grounding main line along the entire length of the bridge, each section (including non linear sections) of the bridge should have at least one point firmly connected to the grounding main line. For oscillation sites, spring coils should be installed at the connection of the grounding part. The planning content of the bridge system engineering should be closely coordinated with civil engineering, technology, and related disciplines to determine the optimal placement. The planning content may include relevant cross-sectional drawings of the bridge system. Layout plan of the bridge system.