protective earthing

由于两端的网络设备具有保护性接地（Protective earthing）电路,当两端的网络 设备通电时，相当于整个布线系统多点接地。

 Protective ground

...保护性接地；电磁兼容性接地；两个接地；系统接地；保护接地；共用接地网；外露导电部分 [gap=238]Keywords: grounding; Grounding classification; Functional grounding; Protective grounding; The electromagnetic compatibility grounding; Two grounding; System grounding; ..