防雷器的接地线径的要求
信号防雷器接地线线径：要求大于2.5mm2；当长度超过0.5米时要求大于4mm2。电源防雷器接地线线径：相线截面积S≤16mm2时，地线用S；相线截面积16mm2≤S≤35mm2时，地线用16mm2；相线截面积S≥35mm2时，地线用16mm2；
相线截面积S≥35mm2时，地线要求S/2 请问此信息点的出处在哪，需要理论依据，是参考什么标准或者其它什么资料 多谢
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