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电气设备接地电阻标准值不应大于多少？有人晓得吗？

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电气设备接地电阻标准值不应大于多少？有人晓得吗？

浏览：55次 | 提问时间： 07-28 04:33

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3个答案

Tears眼泪 07-28 04:33

机房建设防雷接地，应按现行国家标准《建筑防雷设计规范》执行。实际标准有这些：
1、第6.4.3条，交流工作接地、安全保护接地、直流工作接地、防防雷接地等四种接地宜共用一组接地装置，其接地电阻按其中最小值确定；若防雷接地单独设置接地装置时，其余三种接地宜共用一组接地装置，其接地电阻不应大于其中最小值，并应按现行国标准《建筑防雷设计规范》要求采取防止反击措施。
2、第6.4.4条，对直流工作接地有特殊要求需单独设置接地装置的电子计算机系统，其接地电阻值及与其它接地装置的接地体之间的距离，应按计算机系统及有关规定的要求确定。第6.4.5条电子计算机系统的接地应采取单点接地并宜采取等电位措施。第6.4.6条当多个电子计算机系统共用一组接地装置时，宜将各电子计算机系统分别采用接地线与接地体连接。工厂防雷分为整体结构防雷，就是主厂房防雷，主要基础打接地极、接地带，形成一个接地网，接地电阻小于10欧。再与主厂房的钢筋或钢构的主体连接。水泥混凝土屋顶接避雷带或避雷针，墙外地面还得留有接地测试点，钢构应用镀锌扁铁作直接引到屋顶。

给我婚纱梦 07-28 04:42

问题比较空洞,我猜你是问建筑物接地阻值标准,一类防雷建筑物冲击接地电阻不大于10欧姆,二类防雷建筑物冲击接地电阻不大于10欧姆,三类防雷建筑物冲击接地电阻不大于30欧姆

还在吗 07-28 04:50

一、接地电阻测试要求：a.交流工作接地，接地电阻不应大于4Ω；b.安全工作接地，接地电阻不应大于4Ω；c.直流工作接地，接地电阻应按计算机系统详细需求确定；d.防雷保护地的接地电阻不应大于10Ω；e.对于屏蔽系统假如采用联合接地时，接地电阻不应大于1Ω。
二、接地电阻测试仪ZC-8型接地电阻测试仪适用于测量各种电力系统，电气设备，避雷针等接地装置的电阻值。亦可测量低电阻导体的电阻值和土壤电阻率。
三、本仪表工作由手摇发电机、电流互感器、滑线电阻及检流计等组成，全部机构装在塑料壳内，外有皮壳便于携带。附件有辅助探棒导线等，装于附件袋内。其工作原理采用基准电压比较式。
四、使用前检查测试仪是否完整，测试仪包括有这些器件。
1、ZC-8型接地电阻测试仪一台
2、辅助接地棒二根
3、导线5m、20m、40m各一根
五、使用与操作
1、测量接地电阻值时接线方式的规定仪表上的E端钮接5m导线，P端钮接20m线，C端钮接40m线，导线的另一端分别接被测物接地极Eˊ，电位探棒Pˊ和电流探棒Cˊ，且Eˊ、Pˊ、Cˊ应保持直线，其间距为20m1.1测量大于等于1Ω接地电阻时接线图见图1将仪表上2个E端钮连结在一起。谢谢采纳！

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