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.

在简单积灰和其它需隐瞒的环境或野外场所宜加盖板。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）。

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.

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。

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。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中心距为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。

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.

桥架体系应具有牢靠的电气衔接并接地（只对金属桥架。当允许使用桥架体系构成接地干线回路时应契合下列要求。桥架端部之间衔接电阻应不大于0.00033欧姆，接地孔应绝缘涂层。在1KV及以下中性点直接接地体系中，受电设备的接地与体系中性线接地相连。装有处动堵截供电装轩时，桥架的级长方向金属横截面积应不小于规定值。沿桥架全长另敷设接地干线时，每段（包括非直线段）桥架应少有一点与接地干线牢靠衔接。对于振荡场所，在接地部位的衔接处应设备弹簧圈。桥架体系规划内容桥架体系工程规划应与土建、工艺以及有关密切相配合以确定佳安置，其规划内容可含有：桥架体系的有关剖面图。桥架体系的平面安置图。

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.