This Particular Standard applies to high-voltage generators of medical diagnostic X-ray generators and to their assemblies including the following: - high-voltage generators that are integrated with an X-ray tube assembly, - high-voltage generators of radiotherapy treatment simulators. Where appropriate, requirements for X-ray generators are given but only where these concern the functioning of the associated high-voltage generator. This standard excludes: - capacitor discharge high-voltage generators (these are covered by IEC 60601-2-15), - high-voltage generators for mammography, - high-voltage generators for reconstructive tomography.