This standard specifies the electrical, mechanical, and physical requirements of oil-immersed single-phase and three-phase converter transformers. This standard does not apply to other devices, such as the following: - Arc furnace transformers - Rectifier transformers for industrial or locomotive applications Revision Standard - Superseded. The electrical, mechanical, and physical requirements of oil-immersed single-phase and three-phase converter transformers are specified in this standard. Tests are described and test code defined. Devices such as arc furnace transformers and rectifier transformers for industrial or locomotive applications are not covered.