1786-TNCJI4
1786-TNCJI4
1786-TNCJI4
1、当采用等电位接地时,要求将建筑物(或装置)的金属结构、基础钢筋、金属设备、管道、进线配电箱的PE(保护接地线)母排、接闪器引下线形成等电位联结,控制系统保护接地和工作接地应分类汇到该接地板,实现等电位联结,与电气装置合用接地装置并与大地连接。但控制系统在接地网上的接入点应和防雷地、大电流或高电压设备的接入点保持不小于5 米的距离。
2、当采用单独接地时,此时应保证接地电阻小于4 欧姆,且单独接地体与其他电气接地体应相距5m 以上,和独立和防直击雷接地体须相距20 米以上。具体的一点接地的形式根据可现场条件,在以下几种情况下选择。(以下所列情况为工作接地的连接,正常情况下保护接地应接到电气地,若无法将工作接地和保护接地分开,可以将保护接地与工作接地连接到同一单独接地体)
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