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GB 6067—85《起重机械安全规程》规定,起重机轨道的接地电阻,以及起重机上任何一点的接地电阻均不得大于4Ω。《起重机械监督检验规程》规定,桥架型起重机供电电源为中性点直接接地的低压系统时,零线重复非接地电阻不大于4Ω,零线重复接地电阻不大于10Ω。塔式起重机金属结构的接地电阻应小于4Ω。门座起重机轨道的接地电阻应小于4Ω。整机接地电阻小于10Ω。 GB 10055—1996《施工升降机安全规则》规定,施工升降机结构、电动机和电气设备的金属外壳均应接地,接地电阻不大于4Ω。《施工升降机监督检验规程》规定,施工升降机结构、电动机和电气设备的金属外壳均应接地,接
GB 6067-85 “Hoisting Machinery Safety Regulations” provides that the grounding resistance of the crane track, and any point on the crane grounding resistance shall not exceed 4Ω. “Crane Supervision and Inspection Procedures” provides that the bridge crane power supply for the neutral point directly grounded low-voltage system, the zero line repeated non-grounded resistance is not greater than 4Ω, zero grounded repeat grounding resistance is not greater than 10Ω. Tower crane metal structure of the grounding resistance should be less than 4Ω. Grounding resistance of the door crane track should be less than 4Ω. Whole grounding resistance is less than 10Ω. GB 10055-1996 “Construction Lifts Safety Rules” provides that the construction of lift structures, motors and electrical equipment should be grounded metal enclosure, grounding resistance is not greater than 4Ω. “Construction Lifts Supervision and Inspection Procedures” provides that the construction of lift structure, motor and electrical equipment should be grounded metal housing, then