1987年第5期《建筑工人》刊登的“旧房增装三眼插座地线孔接线方法应改进”一文,从原文图1、2看,接线方法为“终端”重复接地,由于零线和接地线短接,电器设备的金属外壳上带有工作零线,即外皮参 In the “Construction Workers” published in the 5th issue of “Construction Workers”, the article “The method for improving the connection of the three-hole socket earth hole of the old house should be improved”. See from the original figure 1, 2 and the wiring method is “terminal” and repeated grounding. Because of the short circuit between the neutral wire and the ground wire, the zero wire and the working zero wire on the metal housing of the electrical equipment, ie the pellicle