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。
NOTE 2 A PEN conductor is a protective earthed neutral conductor combining the functions of both a protective conductor 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。
NOTE 2 A PEN conductor is a protective earthed neutral conductor combining the functions of both a protective conductor and a neutral conductor.
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