If a new crane is not yet operational on delivery but must first be installed or constructed (such as an overhead crane), the mandatory inspection must take place before its initial operation. It must be conducted by a technical expert. It is different for recurring inspections which are allowed to be made by a trained professional.
As a trained professional, the person must be able to evaluate the operational condition of a crane system on the basis of his or her (specialised) knowledge. However, this does not require an official authorisation so that qualified technicians (crane foremen, civil engineers and machine foremen) may also serve as trained professionals for an inspection.
On the whole, the differentiation between a technical expert and trained professional is relevant not just in terms of the acceptance test and inspection before first operation but also regarding recurring accident prevention inspections (UVV).