1、火线与零线接反了有什么危害
如果安装不注意的话，火线与零线接反。这种情况下，火线与零线接反了不会影响到家里的电器的使用，但对于安全用电来讲，是存在隐患的。主要是一些家电的控制开关是用来控制火线的，如果插座处的火线与零线接反了的话，会造成家电的控制开关控制的是零线。
2、火线与地线接反了有什么危害
地线可以防止当电器的电线绝缘出问题而使电器的金属外壳带电。这时如果有人接触到金属外壳，就会引起触电事故。为了防止这类事故的发生，插座内有一极接于地线，当电器的外壳带电时导向大地。此时有人接触外壳时，人体的电阻要远远大于电器外壳与大地间的电阻，所以此时流过人体的电流极小，从而避免触电事故的发生。
如果火线和地线在插座外接反了，那么电器的金属外壳将处于带电状态。此时一旦有人触及外壳将引起触电伤害。
3、零线与地线接反了有什么危害
从工业用电系统上来讲，地线取自大地，电阻小于10欧。而零线取自变压器的中性点，变压器的中性点接地，所以从系统图上看，地线和零线的电位都为零，只是定义不同而已。
但在家装市场上，安装插座时，地线和零线不可以接反主要是因为家里的内漏保开关的原因。
如果接反时，流过漏保开关的进出电流不平衡，从而引起漏保开关的跳闸，影响正常供电。
4、灯泡的零线和火线接反了，灯关掉时怎么会一闪一闪的亮
据用电安全规定：插座安装线路必须左零右火，开关安装线路火线进开关。
解决方法：
1)用普通的电笔在客厅、厨房、房间的插座右边孔内测量一下，看看是否会亮，如果右孔不亮而左孔亮，说明家里的线路全部零线和火线 被接反了。只要将总开关关闭，把总开关下面的两根出线调换一下位置就行了，你自己就能搞定。
2)如果插座用电笔测量正常，说明单是照明线路的问题，一般来说你自己是解决不了的，那你得让装修来返工了。
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