Deals with the safety of isolating transformers for general applications and power supply units incorporating isolating transformers for general applications. Transformers incorporating electronic circuits are also covered by this standard. This Standard is an adoption with national modifications of the second edition of IEC 61558-2-4:2009, Safety of Power Transformers, Power Supplies, Reactors and Similar Products - Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers. There are no national variations from the IEC Standard from which This Standard is adopted, other than those listed in Annex ZZ to AS/NZS 61558.1.