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The authors of the present official DNV document declared two main objectives - the first is to serve as the description of the services provided by the DNV-GL class society relating to the type/component certification of wind turbines as per IEC 61400-22 standard, that would be available publicly, and to serve as a contractual document when making contracts between makers of the equipment and this classification society. The present DNV-GL service specification is intended to describe this society's interpretation of the IEC 61400-22 standard and to cover some additional technical information that may be required for certification in accordance with the above mentioned standard. In this document the customer's obligations have been specified, covering the case where the wind turbine or its component or system is to be certified. In addition to that, this paper is to specify the obligations of this class society and all tasks performed by DNV-GL for certification. It provides some sort of common platform to describe the extent and scope of the verification activities for type certification of turbines and their components, and to serve as a good reference source to define the work scope as required by the applicable certification scheme.