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75页PPT JGJ/T 46-2024 落地实操:建筑临时用电安全核心修订与合规指南

  • 2026-04-15 17:04:35
75页PPT JGJ/T 46-2024 落地实操:建筑临时用电安全核心修订与合规指南

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JGJ/T 46-2024 于 2024 年 9 月发布,2025 年 1 月 1 日正式实施,替代了沿用近 20 年的 JGJ 46-2005,专门针对建筑与市政工程施工现场 220V/380V 三相四线制低压配电系统,全程把控设计、安装、使用、维修和拆除的安全。

标准核心围绕 “三级配电、TN-S 接零保护、二级剩余电流保护” 三大原则。三级配电要求设置总配电箱、分配电箱、开关箱,总配电箱靠近电源,分配电箱放在负荷集中区,两者距离按电压损失不超过 5% 计算,分配电箱到开关箱不超过 30 米,开关箱到用电设备水平距离控制在 3 米内,每台设备必须配专用开关箱,绝对不能 “一闸多机”。

TN-S 系统里,保护接地导体(PE 线)和中性导体(N 线)要分开敷设,PE 线是黄绿双色绝缘线,N 线是淡蓝色,严禁混用。PE 线截面有明确要求,和相导体材质相同时,S<25mm² 时和相导体同径,25≤S≤50mm² 时为 25mm²,S>50mm² 时为 S/2,而且 PE 线不能装开关、不能断线,配电装置和电动机械连接的 PE 线要用不小于 2.5mm² 的绝缘多股软铜线,手持式电动工具的 PE 线不小于 1.5mm²。

二级剩余电流保护(RCD)是新增重点,总配电箱的 RCD 额定剩余动作电流大于 30mA,动作时间大于 0.1s,但两者乘积不超过 30mA・s;开关箱的 RCD 不大于 30mA,动作时间不超过 0.1s,潮湿环境下 RCD 不大于 15mA,动作时间同样不超过 0.1s,而且每月要检测一次 RCD 特性。

配电线路方面,架空线得用绝缘导线,架在专用电杆上,不能架在树木、脚手架上;电缆埋地深度至少 0.7 米,周围铺 50mm 厚细砂再盖硬质保护层,穿越道路要加套管,套管内径不小于电缆外径 1.5 倍。电动机械中,塔吊轨道两端要接地,电缆垂直固定间距不超过 10 米;电焊机一次线不超过 5 米,二次线不超过 30 米,不能用金属构件代替二次线。

照明系统按场景分级限压,隧道、潮湿场所等用不大于 36V 的电源,易触及带电体场所用不大于 24V,金属容器内用不大于 12V,单相回路灯具和插座加起来不超过 25 个,工作电流不超过 16A。

管理上,用电设备 5 台及以上或总容量 50kW 及以上,要编临时用电组织设计,走 “编制 - 审核 - 审批” 流程,工程得经总承包和分包共同验收才能用。还要建立安全技术档案,包含组织设计、检测记录、电工工作记录等 9 类资料,定期复查接地电阻和绝缘电阻。

这套标准细化了技术参数,强化了全周期管理,适配了新技术设备的应用,能大幅提升施工现场用电安全水平。

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  1. CONNECT:[ UseTime:0.001028s ] mysql:host=127.0.0.1;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001548s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000675s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000698s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001234s ]
  6. SELECT * FROM `set` [ RunTime:0.000602s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001450s ]
  8. SELECT * FROM `article` WHERE `id` = 461381 LIMIT 1 [ RunTime:0.002813s ]
  9. UPDATE `article` SET `lasttime` = 1776450269 WHERE `id` = 461381 [ RunTime:0.017816s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000730s ]
  11. SELECT * FROM `article` WHERE `id` < 461381 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002215s ]
  12. SELECT * FROM `article` WHERE `id` > 461381 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002839s ]
  13. SELECT * FROM `article` WHERE `id` < 461381 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.018711s ]
  14. SELECT * FROM `article` WHERE `id` < 461381 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003480s ]
  15. SELECT * FROM `article` WHERE `id` < 461381 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003109s ]
0.228094s