5.5　Mobile Crane

5.5.1　The user of mobile crane shall not change the structure and specified configuration of mobile crane.

5.5.2　The site where mobile crane works shall be flat and solid，and the bearing capacity of such site shall satisfy the requirements as specified in the manufacturer′s technical documents.

5.5.3　If mobile crane will work in a fire or explosion hazard zone，work permit shall be obtained as required.

5.5.4　Warning signs shall be set up in the area where mobile crane works.Persons shall not stay or walk under crane boom or within the slewing radius of crane component.

5.5.5　Mobile crane shall not be operated close to an overhead transmission line，and if unavoidable，the minimum safety distance from the crane boom or workpiece to the overhead transmission line shall be as specified in Table 2.Meanwhile，a dedicated person shall be assigned for supervising，or isolation provisions shall be made for protection purpose.

Table 2　Minimum safety distance from crane boom or workpiece to overhead transmission line

5.5.6　Where two or more mobile cranes are used to lift one workpiece，the lifting load for each mobile crane shall not exceed 75% of its rated capacity.