What requirements are defined in IEC 296 for transformer oil?

IEC 296 is an older designation related to insulating mineral oils for transformers, largely superseded by updated IEC standards. Requirements generally cover quality and acceptance tests such as dielectric strength, moisture, acidity, oxidation stability, viscosity, flash point, density, and corrosion behavior. Utilities use these limits to qualify new oil and to judge service oil condition alongside diagnostic trends. Exact criteria depend on the referenced edition and oil class.