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.

除上述情况外，可根据现场还环境及技能要求选用托盘式、槽式、梯级式、玻璃防腐阻燃电缆桥架或钢质普通型桥架。在简单积灰和其它需隐瞒的环境或野外场所宜加盖板。在公共通道或野外跨过道路段，底层梯级的底部宜加垫板或在该段使用托盘 。大跨距跨过公共通道时，可根据用户要求提高桥架的载荷能力或选用行架。大跨距（>3m）要选用复合型桥架（FB）。野外要选用复合环氧树脂桥架（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.

标准挑选桥架的宽度和高度就按下表挑选，并应契合电缆填充率不超越有关标准规范的规定值，动力电缆可取40-50%，控制电缆可取50-70%，别的需预留10-25%的式程开展余量。各种弯通及附件标准应契合工程安置条件并与桥架相配套。支、吊架标准的挑选，应按桥架标准、层数、跨距等条件配置。并应满意荷载的要求。桥架横截面积的挑选见支、吊架的配户内支、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非直线段的支、吊架配置就遵循以下准则。当桥架宽度<300mm时，应在距非直线段与直线结合处300-600m的直线段侧设置一个支、吊架。当桥架宽度>300mm时，除契合下述条件外，在非直线段中部还应增设一个支、吊架。桥架多层设置时层间距为200，250，300，350mm。桥架直线段每隔50m应予留伸缩缝20-30mm（金属桥架）。防火要求桥架防火的区段，有必要选用钢制或不燃、阻燃资料。我公司出产的BJⅢ系列电缆桥架均为防火桥架。

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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