TN - S系统中金属低压电缆桥架的接地配置探析
李沛岩(中衡设计集团股份有限公司,北京市 100044)
王梦梦(中国建筑设计研究院有限公司,北京市 100044)
吕许光(中衡设计集团股份有限公司,北京市 100044)
Analysis of the Earthing Arrangement of Metal Low‑voltage Cable Tray in TN - S System
LI Peiyan(ARTS Group Co.,Ltd.,Beijing 100044,China)
WANG Mengmeng(China Architecture Design & Research Group,Beijing 100044,China)
LV Xuguang(ARTS Group Co.,Ltd.,Beijing 100044,China)
Abstract:According to the analysis of relevant specifications for cable tray,it is determined that the metal low‑voltage cable tray in TN - S system is an exposed conductive part. In engineering,measures shall be taken for the earthing arrangement of the cable tray according to the specifications of the exposed conductive parts. For the earth fault of the cable tray,appropriate troubleshooting or fault elimination methods shall be taken.
Key words:steel cable tray;TN - S system;exposed conductive part;extraneous conductive part;protective‑equipotential‑bonding;earthing arrangement;protective earthing conductor
摘 要:根据对桥架相关规范的分析,确定在TN - S系统中金属低压电缆桥架是外露可导电部分。在工程上,桥架的接地配置要按外露可导电部分采取措施,对桥架发生的接地故障,要采取合适的排查或消除故障的方法。
关键词:钢制电缆桥架;TN - S系统;外露可导电部分;外界可导电部分;保护等电位联结;接地配置;保护接地导体
中图分类号:TM757 文献标识码:A
doi:10.3969 / j. issn.1003 - 8493.2023.05.011