What are the installation requirements for cable earthing protection boxes and direct grounding boxes?

1.屏蔽一端直接接地，另一端通过护层保护接地：当线路长度在500---700m及以下时，屏蔽层可采用一端直接接地（电缆终端头位置接地），另一端通过护层保护器接地。

1. One end of the shield is grounded directly, the other end is grounded through protective layer: when the length of the line is 500-700m or less, the shield layer can be grounded directly at one end (grounded at the end of the cable), and the other end is grounded through protective layer.

2.屏蔽中点接地：当线路长度在1000----1400m时，须采用中点接地方式。（1）在线路的中间位置，将屏蔽直接接地，电缆两端终端头的屏蔽通过护层保护器接地。中间接地点一般需安装一个直通接头。（2）在线路中点安装一个绝缘接头，绝缘白钢雕塑 小型滚揉机 防火电缆 托辊设备 水刀切割机  铜钟 石雕狮子  校园不锈钢雕塑 扭王块模具接头将电缆屏蔽断开，屏蔽两端分别通过护层保护器接地，两电缆终端屏蔽直接接地。

2. shielding neutral point grounding: when the line length is 1000----1400m, the neutral point grounding mode must be adopted. (1) In the middle position of the circuit, the shield is directly grounded, and the shield at both ends of the cable is grounded through the shield protector. The intermediate junction generally needs to install a through joint. (2) Install an insulated joint at the midpoint of the circuit. The insulated joint disconnects the cable shield, and the shielded ends are grounded through the protective layer protector respectively. The two cable terminals are shielded and grounded directly.