Discussion and Analysis of Some Problems in the Earthing of Metal Raceway （Cable Tray）

 

Yang Chao（Fujian Construction Engineering Quality Safety Supervision Central Station，Fuzhou 35 0 0 0 1，China）

 

Abstract As the exposed conductive parts of the electrical circuit，the connection of the earthing of the metal raceway（cable tray）must be reliable，and the product quality，design requirement and construction quality have great effect on the earthing reliability. The arrangement of the special earthing studs，determination of the position of the earthing wire connecting points，selection of the cross- section of the jumper earthing wire of the metal raceway（cable tray）and the control of earthing construction quality are discussed and analyzed in this paper. 

Key words Metal raceway Metal cable tray Earthing Jumper Earthing wire

 

摘 要 金属线槽（电缆桥架）作为电气线路的外露可导电部分，其接地必须连接可靠，而产品质量、设计要求以及施工质量对其接地的可靠性影响甚大。本文从金属线槽（电缆桥架）专用接地螺栓的设置、接地线连接点位置的明确、跨接接地线截面的选择，以及接地施工质量的控制等方面进行探讨与分析。

关键词 金属线槽 金属电缆桥架 接地 跨接接地线