工厂里有单独变压器，三相四线的配电箱里零线能否直接接地做为接地保 三相四线中；在配电箱内零线为工作零线因为接触器是220伏的；...
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Ud=27.5\u00d74=110V
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工厂有单独的变压器，按照现行安全用电的规范，企业电网接地系统优先使用TN系统。TN系统中有三种，其中TN-C就是俗称的零地共用系统，在变压器端，中线直接接地，系统采用三相四线制，其中的第四根线即PEN线，这是可以的。但这种系统的安全程度不高，在三相不平衡的时候，PEN线对地会有电压降，可能造成触电事故。比较先进的是TN-S系统，在变压器端中线与接地线同时接地，在供电系统中，两者的分别起不同的作用，不再合并。中线只负担三相不平衡的回路，PE线只作为接地保护用。在TN-C和TN-S之间的是TN-C-S系统，不是电网接地的主流。三种接地的示意图如下：
不可以。
零线是在供电端（发电厂、变电站、变压器）接地，或在入户前重复接地，是工作接地线，是输电线路的一部分，电流经电厂----火线----负载----零线反回电厂。
地线在用户端接地，和用电电器的金属外壳或人体可触部位连接，使机壳与大地等电位，保护人体不触电。零线不与输电线路构成回路，正常情况下没有电流。
但是，如果前端（变压器端）发生故障，致使用零线带电，零线作保护接地的作用就完全失去了，并且会给用户带来生命和财产的损失。
所以，强列建议零线与地线分开。
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