为什么要做防雷接地？机房、监控、布线项目如何做防雷接地？( 二 ) _生活百科

portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">接地铜板采用宽60mm(厚10mm)之L型铜板固定于楼板，此铜墙铁壁板作为所有应与机房接地之设施的总接地。
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">4、地网
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">机房有架设高架地板，则应以2.5mm之多芯裸铜线缠绵高架地板柱做地网。
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">5、安防接地电阻
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">安全保护接地、直流工作接地、防雷接地分设时，接地电阻值应符合以下规定：
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">①安全保护接地，接地电阻不应10Ω;
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">②直流工作接地，接地电阻不应4Ω;
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">③防雷接地，接地电阻不应10Ω 。
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">采用角钢50×50×5mm ，长1.5m～2.5m;角钢与角钢的连接用扁钢，间隔≥4～5m ，角钢≥40×4mm；引线采用50mm2多股铜芯绝缘线或按设计规定;引线与扁钢连接采用焊接，焊接点需进行防腐处理;
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">二、监控项目如何做防雷接地？
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">端设备防雷
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">1、前端设备如摄像头应置于接闪器（避雷针或其它接闪导体）有效保护范围之内。当摄像机独立架设时，避雷针最好距摄像机 3－4 米的距离。如有困难避雷针也可以架设在摄像机的支撑杆上，引下线可直接利用金属杆本身或选用Φ8 的镀锌圆钢。为防止电磁感应，沿杆引上摄像机的电源线和信号线应穿金属管屏蔽。
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">2、为防止雷电波沿线路侵入前端设备，应在设备前的每条线路上加装合适的避雷器，如电源线（AC220V 或 DC12V）、网线、控制线、开关线。
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">3、摄像机的电源一般使用AC220V 或 DC12V 。摄像机由直流变压器供电的，单相电源避雷器应串联或并联在直流变压器前端，如直流电源传输距离大于 15 米，则摄像机端还应串接低压直流避雷器。
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">4、室外的前端设备应有良好的接地，接地电阻小于4Ω ，高土壤电阻率地区可放宽至 10Ω 。
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">整体设备防雷接地结构如下两张图：
portant; overflow-wrap: break-word !important; color: rgb(62, 62, 62); font-family: Optima-Regular, PingFangTC-light; font-size: 15px; letter-spacing: 0.544px; text-indent: 34px;">三、传输线缆如何做防雷接地？