AS/NZS 61558.2.23:2025 deals with the safety of transformers for construction sites and power supply units incorporating transformers for construction sites. This Standard will supersede AS/NZS 60335.2.40:2019 three years from the date of publication (i.e. on 27 June 2028). During this period, it is anticipated that regulatory authorities will approve transformers and power supply units for construction sites to either standard.