从变压器出来的零线,还需要在重新接地吗?我是建筑施工临时用电,总配电箱里单独做了接地线的。 施工现场临时用电保护零线重复接地不能少于几处

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12\u3001\u5efa\u7acb\u5b89\u5168\u6559\u80b2\u548c\u57f9\u8bad\u5236\u5ea6\uff0c\u5b9a\u671f\u5bf9\u4e13\u4e1a\u7535\u5de5\u548c\u5404\u7c7b\u7528\u7535\u4eba\u5458\u8fdb\u884c\u7528\u7535\u5b89\u5168\u6559\u80b2\u548c\u57f9\u8bad\u3002\u51e1\u4e0a\u5c97\u4eba\u5458\u5fc5\u987b\u6301\u6709\u5173\u90e8\u95e8\u6838\u53d1\u7684\u4e0a\u5c97\u8bc1\u4e66\uff0c\u4e25\u7981\u65e0\u8bc1\u4e0a\u5c97\u3002
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u65bd\u5de5\u73b0\u573a\u4e34\u65f6\u7528\u7535
\u53c2\u8003\u8d44\u6599\u6765\u6e90\uff1a\u767e\u5ea6\u767e\u79d1-\u65bd\u5de5\u73b0\u573a\u4e34\u65f6\u7528\u7535\u5b89\u5168\u6280\u672f\u89c4\u8303\u5b9e\u65bd\u624b\u518c

从变压器出来的零线,在变压器处作可靠接地之后,如果在总配电箱里分作两路,一路为工作零线(N线),该零线将通过(总)漏电保护开关(漏电断路器),该零线严禁再做重复接地。另一路作为保护零线(PE线),PE线不得经过任何开关(不得有可断开处),PE线必须在配电系统的中间处和末端处做重复接地。且PE线引出后不得与N线再有任何连接。见《JGJ 46-2005 施工现场临时用电安全技术规范》5.1.1、图5.1.1、5.1.2、图5.1.2、5.1.3、5.1.4、5.1.10、5.3.2、5.3.3。
实际上这属于三相五线制供电,属 TN-S 系统。

根据你的情况,如果变压器离你的总配电箱很近,可以不再接地,直接接入配电箱的地,电阻小于4欧姆必须。如果变压器离你的总配电箱比较远,就要考虑在变压器处直接接地,再引入总配电箱。

根据施工线路的长度,超过一定的长度要接地,主要施工机械都要单独接地。
相关规定:5.3.2 TN系统中的保护零线除必须在配电室或总配电箱处做重复接地外,还必须在配电系统的中间处和末端处做重复接地。
具体可参见《施工现场临时用电安全技术规范》

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