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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。
This is particularly the case for the third harmonic, which causes a sharp increase in the zero sequence current, and therefore increases the current in the neutral conductor.
尤其是第三个谐波，这将导致零序电流急剧增加，从而增加了中性线的电流。
It illustrates the existence of stray electromagnetic field and its hazards, and brings forward opinions on the meaning of neutral point and neutral conductor in building electricity.
举例说明杂散电磁场的存在和危害，并对建筑电气中的中性点、中性线名词的含义提出意见。
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