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保护接地的作用是什么?

问答题
2021-08-30 05:30
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正确答案

人体与接地极构成了并联,而人身电阻为1000Ω,接地极电阻为2Ω,通过电阻并联与电流的关系,则通过人身电流比较小,因而是安全的。
另外,有了保护接地极的良好接地,大大减少了因设备漏电时,使其外壳与地接触不良产生的电火花。从而减少了引起瓦斯、煤尘爆炸的可能性。


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