现代生活和各项工作几乎都离不开电。要达到安全用电，就必须采用保护接地；反过来说，使用保护接地措施的目的就是为了安全用电。所谓安全用电，简而言之就是在电的生产、输送和使用过程中，做到人和电气设备、测量仪表等的安全，尤其是人的安全。若要达到安全用电，首先... Modern life and almost all work can not do without electricity. To achieve safe use of electricity, it is necessary to use protective earth; conversely, the purpose of using protective earthing measures is for safe use of electricity. The so-called safe use of electricity, in short, is in the electrical production, transportation and use of the process, so that people and electrical equipment, measuring instruments, etc., especially human safety. To achieve safe use of electricity, first of all ...