380电源分成220电源什么情况下零线烧断_百度知道
380电源分成220电源什么情况下零线烧断
有时会达到380vAc，此时原单相负载的电压升为330VAC左右，并经过该零线与另一相火线构成回路、后面的负载零线就成为火线了总零线开路，所以就坏了
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