NOTE 2 A PEN conductor is a protective earthed neutral conductor combining the functions of both a protectiveconductor and a neutral conductor.
注2: PEN导线是指将保护导线和中性导线两种功能结合在一起的保护接地中性线。
2
NOTE This provision includes a protective earthing conductor in the supply cord.
注:此防护措施包括电源线中的保护性导线。
3
This paper analyses the principle and functions of protective earthing and hanging earthing conductor , and analyses the existing problems in practice.