1, PE line is called "protective conductor" in simplified Chinese, which is also commonly known as "ground wire". In China, PE wire is a kind of yellow-green double-color wire, which is a conductor specially used for grounding the exposed conductive part of electrical equipment. Whether it is directly connected to the grounding electrode (TT) which has nothing to do with the power point working grounding or grounded through the power neutral point (TN), it is called PE line.