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 Sketch Coloring Page

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

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