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我所对在用的桥(门)式起重机进行定期检验时,发现在电气方面存在着诸多带有共性的问题。1 起重机上220V 用电设备用金属结构做回路起重机采用3根裸滑线供电,这种供电方式的起重机上没有专用丁作零线。《起重机械监督检验规程·桥架型起重机》(以下简称《检规》)6.5规定:“……无专用工作零线时,照明用220V 交流电源应由隔离变压器获得,严禁用金属结构做照明线路的回路”检验中发现相当一部分起重机未设置隔离
During my regular inspection of the bridge crane used, I found that there were many common problems with the electrical aspects. A cranes on the 220V electrical equipment with a metal structure of the circuit cranes with 3 bare slide line power supply, this power supply cranes do not have special Dingzong zero line. “Crane Supervision and Inspection Procedures · Bridge Crane” (hereinafter referred to as “Inspection Regulations”) 6.5 states: “...... Without dedicated work zero line, lighting with 220V AC power supply should be obtained by the isolation transformer is strictly prohibited to do with metal structures Circuit lighting circuit ”" inspection found a considerable part of the crane is not set isolation