家庭里面没有安装接地线，只安装了漏电保护器，首先要确保漏电保护器有效（定期检测），漏电电流在30毫安及一下保护器，漏电跳闸时间在0.1秒。这样是有效果的，设备一旦漏电，人接触设备金属外壳时，在0.1秒就跳闸。目前大部分家庭里漏电保护器没有定期检测，如果漏电保护器失效，就会留下安全隐患。
 
注意看右下角写的那行字——“电流互感器”。这是漏电开关的主要检测元件，类似于汽车的方向盘——断路器是不是提供保护、什么时候提供保护，都是依靠电流互感器的判断。
电流互感器的作用，可以理解成我们初中物理中学到的电流表——测量电流。电流互感器的圈（现实中，电流互感器的确是个圈）同时套住了零线和火线，表示该互感器同时测量零线和火线上的电流。
测量出来的结果，直接传输到电子组件线路板上，让线路板进行分析。diangon.com版权所有，正常情况下，火线上的电流应该和零线上的电流相等——矢量和为0。什么叫漏电？就是这个回路中的导体和其它导体和其它导体形成新的回路，导致电流外泄。

因此，只要发生漏电，必然会导致零线和火线上的电流不相等——矢量和不为0。那么，当电子组件分析出两根线上的电流不同了，就开始考虑为电路提供漏电保护——跳闸。
当然，电路中的电感、电容、晶体管等，均有可能导致零线和火线上的电流不相等。为了防止断路器误动作，家庭中使用的漏电开关将动作电流设置为30mA（对电路要求较高的场所，比如通信部门，则可能将这个数值设置的更低）——30mA，是人体能够承受的最大安全电流。所谓的“安全”，指的是电不死人、对人体造不成太大伤害，但还是会感觉剧痛无比、嗓子眼里有血腥味、眼冒金星、手脚发软——一个靠人体触电让漏电开关跳过闸的人的亲身感受。

第一:装地线的装了地线的是针对的三头插座，而三头插座的地线直接接在了用电器外壳上面！而如果发生漏电，或者火线零线直接和用电器壳通了的话！那这个漏电保护器会直接跳闸而送不上电的！因为火线或者零线和接地形成了回路！人体就不会被点击！常见热水器电饭锅烤箱冰箱等等外壳是金属的……

第二:没装地线的而没装地线呢？比如你的电水壶，火线和外壳通了！而你恰恰放在木质桌子或者塑料桌子上！漏电保护器就不会跳闸！当你用手去触摸用电设备外壳就会被电一下！然后漏电保护器才会跳闸！因为木质和塑料的是绝缘的！没有接地线就是和大地没有形成回路！而你触摸到的时候你就成为了导体！和大地形成了回路！所以在电你的同时也同时会跳闸！当然你有时穿了拖鞋这些摸到只会感觉麻麻的！你赤脚一下就知道厉害了！

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