为什么电子设备�属外壳已经接入tn S系统的pe线,还要经等电位联结并接地?有必要吗? 知乎 Template




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tomski为什么电子设备�属外壳已经接入tn s系统的pe线,还要经等电位联结并接地?有必要吗? 知乎 coloring