PEN, PEM, PEL

PEN

Conductoe for Both Protective Earthing Conductor and Neutral Conductor, 보호도체와 중성선을 겸한 도체

PEM

Conductoe for Both Protective Earthing Conductor and Mud-point Conductor, 보호도체와 중간선 기능을 겸한 도체

PEL

Conductoe for Both Protective Earthing Conductor and Line Conductor, 보호도체와 전압선을 겸한 도체