接线板上有三脚插孔,为什么它本身却是两脚的?它上面的三脚插孔这是不是接不了地线?

2025-03-15 12:21:09
推荐回答(2个)
回答1:

是的,两个脚插孔插座没有接地线,三个脚插孔多一个接地线。有接地线的设备更安全,当设备漏电、短路时,人触及设备也不会受到伤害。

三脚插头的三个插头也呈等腰三角形分布,底角处的两个插脚与两脚插头一样,连接用电器的用电部分,顶角处的插脚与用电器的金属外壳相连。当将插头插入插座时,不仅用电器的用电部分与火线和零线连通,同时,用电器的金属外壳也与大地连通。

扩展资料:

三个脚中较长的脚是接地的,可称做接地脚,另外两个较短的脚是把家用电器接入电路,可称它们为导电脚。在设计电源插头时,为考虑到使用者的安全,有意识地将接地脚设计得比导电脚长几个毫米。这是因为在插入三脚插头时,接地脚先接触插座内的接地线,这样可先形成接地保护,后接通电源;反之,在拔出三脚插头时,导电脚先与电源插座内的导电端分开,接地脚后断开。

如果家用电器的金属外壳由于绝缘体损坏等原因而带电,这时接地脚就会形成接地短路电流,使家用电器的金属外壳接地而对地放电,从而使人不被触电,起到安全保护的作用。

参考资料来源:百度百科-地线

回答2:

是滴,两个脚插孔插座没有接地线,三个脚插孔多一个接地线。有接地线的设备更安全------当设备漏电、短路时,人触及设备也不会受到伤害。

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