当前位置:首页>课件>【课件】临时用电安全通病防治手册(接地与接零保护、配电线路、配电箱与开关箱等)|55页PPT

【课件】临时用电安全通病防治手册(接地与接零保护、配电线路、配电箱与开关箱等)|55页PPT

  • 2026-03-29 11:06:30
【课件】临时用电安全通病防治手册(接地与接零保护、配电线路、配电箱与开关箱等)|55页PPT

临时用电安全通病防治手册主要依据《施工现场临时用电安全技术规范》(JGJ46-2005)等标准,以下是关于接地与接零保护、配电线路、配电箱与开关箱等关键内容的总结:

一、接地与接零保护

1.接地与接零系统设置  

· 必须采用TN-S接零保护系统,电气设备金属外壳需与保护零线(PE线)可靠连接。  

· 专用变压器供电时,PE线应从总配电箱电源侧零线重复接地处引出;三相四线制配电时,需采用五芯电缆,PE线颜色为绿/黄双色。

2.重复接地要求  

· PE线的重复接地电阻值不应大于10Ω,且需在配电室、配电线路中间和末端处设置。  

· 接地体宜采用角钢、钢管或光面圆钢,严禁使用铝导体或螺纹钢。

3.接地线规范  

· 配电装置和电动机械的PE线应为截面不小于2.5mm²的多股双色铜芯线,手持式电动工具的PE线截面不小于1.5mm²。  

· 接地线应采用2根以上导体,在不同点与接地体连接,且连接点不得被掩埋。

二、配电线路

1.架空线路  

· 线间距不得小于0.3m,靠近电杆的两导线间距不得小于0.5m。  

· 相线颜色依次为黄、绿、红色,N线为淡蓝色,PE线为绿/黄双色,严禁混用。

2.电缆敷设  

· 电缆应埋地或架空敷设,严禁沿地面明设。在建工程内电缆需埋地引入,严禁穿越脚手架。  

· 架空电缆应沿电杆、支架或墙壁敷设,固定点间距应保证电缆能承受自重,沿墙敷设时弧垂距地不得小于2.0m。

3.线路接头  

· 架空线在一个档距内,每层导线接头数不得超过该层导线条数的50%,且一条导线只能有一个接头。  

· 动力和照明线路分层架设时,相序排列需符合规范。

三、配电箱与开关箱

1.基本要求  

· 采用三级配电系统,总配电箱、分配电箱和开关箱需分别设置,且PE线应通过PE线端子板连接。  

· 配电箱、开关箱应装设端正、牢固,中心点与地面垂直距离为1.4-1.6m,移动式箱体距地0.8-1.6m。

2.电器配置  

· 开关箱必须装设隔离开关、断路器或熔断器,以及漏电保护器。漏电保护器额定漏电动作电流不大于30mA,动作时间不大于0.1s。  

· 动力和照明线路应分路配电,开关箱严禁控制2台及以上用电设备。

3.防护与标识  

· 配电箱、开关箱应防雨、防尘,周围应有足够空间和通道,不得堆放杂物。  

· 箱内应有系统接线图,电器安装板材质应为金属或非木质阻燃绝缘材料。以上内容仅为部分关键要点,实际应用中需严格遵循规范要求,定期检查和维护临时用电设施,确保安全运行。

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  1. CONNECT:[ UseTime:0.000555s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000777s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000331s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000274s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000487s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000551s ]
  8. SELECT * FROM `article` WHERE `id` = 467031 LIMIT 1 [ RunTime:0.001515s ]
  9. UPDATE `article` SET `lasttime` = 1775559860 WHERE `id` = 467031 [ RunTime:0.000881s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000237s ]
  11. SELECT * FROM `article` WHERE `id` < 467031 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000409s ]
  12. SELECT * FROM `article` WHERE `id` > 467031 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000524s ]
  13. SELECT * FROM `article` WHERE `id` < 467031 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002541s ]
  14. SELECT * FROM `article` WHERE `id` < 467031 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001738s ]
  15. SELECT * FROM `article` WHERE `id` < 467031 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001006s ]
0.079561s