Products containing external power supplies (e.g. USB sockets) which would need to be extracted from the main product and rewired for testing, cannot be tested under Regulation (EU)2019/1782, as there are no standards or methodologies describing such operation. In such situation the Regulation cannot be enforced. Products containing external power supplies (e.g. USB sockets), for which the functions of the main product apart from the EPS can be fully disabled by user operation (e.g. a table luminaire with a mechanical on/off switch), fall under the scope of Regulation (EU)2019/1782. In such cases, the technical documentation must describe how to disable the functions of the main product apart from the EPS.
Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.