Deals with the safety of switch mode power supply units and transformers for switch mode power supply units. Transformers incorporating electronic circuits are also covered by this standard. An adoption with national modifications of the second edition of IEC 61558-2-16:2009, Safety of Power Transformers, Power Supplies, Reactors and Similar Products for supply voltages up to 1 100 V – Part 2.16: Particular requirements for switch mode power supply units and transformers for switch mode power supply units. It has been varied as indicated to take account of Australian and New Zealand conditions. This part 2 has to be used in conjunction with the latest edition of AS/NZS 61558.1 Safety of Power Transformers, Power Supplies, Reactors and Similar Products – Part 1: General requirements and tests and its amendments. It was established on the basis of the 2008 edition of that standard. Amendments and revisions of Part 1 have also to be taken into account and the dates when such changes become applicable will be stated in the relevant amendment or revision of Part 1. This part 2 supplements or modifies the corresponding clauses of AS/NZS 61558.1 so as to convert it into the Australian/New Zealand Standard: Safety requirements for switch mode power supply units and transformers for switch mode power supply units. 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.