The selection of cable tray type and type requires shielding the cable network disturbed by electrical appliances or when there are requirements to protect the impact of external (such as corrosive liquid, flammable dust and other environments), the (FB) trough type composite anti-corrosion shielded cable tray (with cover) shall be selected. In highly corrosive environments, the (f) type composite epoxy resin anti-corrosion flame-retardant cable tray shall be selected. The same data should be used for corbel and support to improve the service life of cable tray and accessories. Cover plate should be added in simple ash accumulation and other environment or field places that need to be concealed.

除上述情況外，可根據現場還環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）。野外要選用復合環氧樹脂橋架（F）。

In addition to the above conditions, tray type, trough type, step type, glass corrosion-resistant and flame-retardant cable tray or steel ordinary cable tray can be selected according to the site environment and technical requirements. Cover plate should be added in simple ash accumulation and other environment or field places that need to be concealed. In public passages or cross aisle sections in the field, the bottom of the bottom step should be equipped with a base plate or a pallet in this section. When crossing the public passage with large span, the load capacity of the bridge can be improved or the traveling frame can be selected according to the user's requirements. Composite bridge (FB) shall be selected for large span (>3m). Composite epoxy resin bridge (f) shall be selected in the field.

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范的規定值，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、跨距等條件配置。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。

The width and height of the standard selection bridge are selected according to the following table, and should be consistent with the fact that the filling rate of the cable does not exceed the specified value of the relevant standards and specifications. The power cable can be 40-50%, the control cable can be 50-70%, and 10-25% of the process development allowance should be reserved for others. The standards of various bends and accessories shall conform to the engineering placement conditions and be matched with the bridge. The selection of support and hanger standards should be configured according to bridge standards, floors, spans and other conditions. And the requirements of load shall be satisfied. For the selection of the cross-sectional area of the bridge, see the allocation of supports and hangers. The short span of indoor supports and hangers is generally 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。

The mid span of field column is generally 6m, and the support and hanger configuration of non-linear section follows the following guidelines. When the bridge width is less than 300mm, a support and hanger shall be set at the side of the straight section 300-600m away from the junction of the non-linear section and the straight line. When the bridge width is >300mm, in addition to meeting the following conditions, a support and hanger shall be added in the middle of the non-linear section. When the bridge is set in multiple layers, the center distance between layers is 200250300350mm. Expansion joints of 20-30mm (metal bridge) shall be reserved every 50m in the straight section of the bridge. It is necessary to select steel or nonflammable and flame retardant materials in the fire-proof section of the bridge. BJ Ⅲ series cable trays produced by our company are fire-proof trays.

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