1) The width and height of the composite epoxy resin cable tray shall be selected according to the following table, and shall meet the requirements that the true charge rate of the cable shall not exceed the specified value of the relevant standards and specifications. The power cable may take 40-50%, the control cable may take 50-70%, and 10-25% of the process development margin shall be reserved.

2）各种弯通及附件规格应符合工程布置条件并与桥架相配套。

2) The specifications of various bends and accessories should comply with the engineering layout conditions and be matched with the bridge.

3）支、吊架规格的选择，应按桥架规格、层数、跨距等条件配置。并应满足荷载的要求。

3) The selection of support and hanger specifications should be based on conditions such as cable tray specifications, number of layers, and span. And it should meet the requirements of the load.

（3）对于电缆桥架的支、吊架的配置

(3) Configuration of supports and hangers of cable tray

1）户内支、吊短跨距一般采取1.5-3m；户外立柱中跨距一般采取6m。

1) The short span of indoor support and suspension is generally 1.5-3m; The span of outdoor columns is generally 6 meters.

2）非直线段的支、吊架配置就遵循以下原则：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，除符合下述条件外，在非直线段中部还应增设一个支、吊架。

2) The configuration of supports and hangers for non linear sections follows the following principles: when the bridge width is less than 300mm, a support or hanger should be set on the side of the straight section 300-600m away from the junction of the non linear 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.

3）拉挤玻璃钢电缆桥架多层设置时层间中心距为200，250，300，350mm。

3) The center distance between layers of pultruded glass fiber reinforced plastic cable tray is 200250300350mm.

4）桥架直线段每隔50m应予留伸缩缝20-30mm（金属桥架）。

4) 20-30mm expansion joint (metal bridge) shall be reserved every 50m in the straight section of the bridge.

（4）关于线缆桥架的一些计算公式

(4) Some calculation formulas for cable trays

电缆桥架是用薄钢板冲压而成。其承载能力具有一定的限度。电缆桥架的载荷能力的大小是一个与桥架规格和支撑距离有关的量。对应于同一支撑距离和弯凸变形量，侧面高度大的桥架承载能力大，高度小的桥架承载能力小。另外当载荷能力划、相同时，对于同一规格的电缆桥架，支撑距离小的比支撑距离大的弯曲变形量小。一般情况下电缆桥架每隔1.5～2.0m安装一组支撑架。

The cable tray is stamped with thin steel plate. Its carrying capacity has a certain limit. The load capacity of cable tray is a quantity related to the bridge specification and support distance. Correspondingly to the same support distance and bending deformation, the bridge with larger side height has higher bearing capacity, while the bridge with smaller height has lower bearing capacity. In addition, when the load capacity is the same, for the cable tray of the same specification, the bending deformation of the cable tray with smaller support distance is smaller than that with larger support distance. Generally, a group of support frames shall be installed every 1.5~2.0m for cable tray.