Cable tray grounding is a very important task, and its requirements mainly include the following aspects:

1. 接地电阻要符合规定值：根据标准，电缆桥架的接地电阻应小于等于4欧姆。接地电阻越小，接地效果越好，有助于保护设备和人员。

1. The grounding resistance should meet the specified value: According to national standards, the grounding resistance of cable trays should be less than or equal to 4 ohms. The smaller the grounding resistance, the better the grounding effect, which helps to protect equipment and personnel safety.

2. 接地网的布置要合理：接地网是连接各个接地电极的导线网，应该均匀布置在电缆桥架的各个部位，保证良好的接地效果。同时，接地网也需要与大地接地系统进行可靠连接。

2. The layout of the grounding grid should be reasonable: The grounding grid is a wire network that connects various grounding electrodes and should be evenly arranged in various parts of the cable tray to ensure good grounding effect. At the same time, the grounding network also needs to be reliably connected to the grounding system.

3. 接地电极选择要适当：接地电极的选择应考虑到地壤电阻率、土壤湿度、地下水位等因素。一般情况下，接地电极可以采用埋地金属棒或埋地导体，确保与大地形成良好的接地连接。

3. The selection of grounding electrodes should be appropriate: The selection of grounding electrodes should consider factors such as soil resistivity, soil moisture, and groundwater level. In general, the grounding electrode can use buried metal rods or buried conductors to ensure a good grounding connection with the ground.

4. 接地电缆的引入要合理：接地电缆应采用铜导体，截面积要足够大，以保证低电阻的导通性能。电缆的引入应尽量避免与其他电源线路、信号线路等相互干扰。

4. The introduction of grounding cables should be reasonable: copper conductors should be used for grounding cables, and the cross-sectional area should be large enough to ensure low resistance conductivity. The introduction of cables should try to avoid mutual interference with other power lines, signal lines, etc.

5. 接地设备的安装要牢固可靠：接地设备包括接地电极、接地网、连接线等，应固定牢固，并且能够承受外力和环境条件的影响，确保长期稳定可靠地发挥接地作用。

5. The installation of grounding equipment should be firm and reliable: grounding equipment, including grounding electrodes, grounding grids, connecting wires, etc., should be firmly fixed and able to withstand external forces and environmental conditions, ensuring long-term stable and reliable grounding function.

总之，电缆桥架接地的要求是为了保证设备和人员的，减少电气事故的发生。在进行接地工作时，需要严格按照相关规范和标准操作，确保接地系统的性能达到设计要求。

In short, the requirement for cable tray grounding is to ensure the safety of equipment and personnel, and to reduce the occurrence of electrical accidents. When conducting grounding work, it is necessary to strictly follow relevant specifications and standards to ensure that the performance of the grounding system meets the design requirements.