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电气安装工程中,经常有单相三孔插销的安装。有很多电工认为这种插销与单相二孔插销的区别不大,可以互相代用,其实不然。单相三孔插销除了具有与单相二孔插销一样的相线孔、零线孔以外,还有一个保护接零孔。它的作用有以下两点:1.医院、研究所等经常有各种各样的精密电子仪器。为防止外界各种电波的干扰,保证使用的精确度与准确度,仪器的金属外壳均有一根屏蔽线。这根屏蔽线插在保护接零孔上与地极相连,消除了外界
In electrical installations, there are often single-phase three-hole plugs installed. There are many electricians who think that this type of plug has little difference with a single-phase two-hole plug and can be used interchangeably. This is not the case. In addition to the single-phase two-hole plug has the same phase hole and zero hole as the single-phase two-hole plug, it also has a protective zero hole. Its role has the following two points: 1. Hospitals, research institutes, etc. often have a variety of sophisticated electronic instruments. In order to prevent interference of various kinds of radio waves in the outside world and ensure the accuracy and accuracy of use, there is a shielded wire in the metal shell of the instrument. This shielded wire is inserted in the protective zero hole and connected to the earth, eliminating the outside world