桥式起重机使用四极滑触线的必要性

摘要

The paper analyzes the new and old standards regarding crane earthing protection,describes the necessity of using four-pole sliding contact line,analyzes the common situations in application of three-pole and four-pole sliding contact lines,and expounds key points in crane installation and periodic inspection.%对起重机接地保护的新老标准做了分析，阐述了采用四极滑触线的必要性，对目前存在较多的三级和四极滑触线常见状况做了分析，论述了起重机安装和定期检验中的要点。