IEC 60601-1-2:2014+A1:2020 applies to the basic safety and essential performance of Medical Equipment (ME) equipment and ME systems in the presence of electromagnetic disturbances and to electromagnetic disturbances emitted by me equipment and me systems. This collateral standard to IEC 60601-1 specifies general requirements and tests for basic safety and essential performance with regard to electromagnetic disturbances and for electromagnetic emissions of ME equipment and ME systems. They are in addition to the requirements of the general standard IEC 60601-1 and serve as the basis for particular standards. This fourth edition cancels and replaces the third edition of IEC 60601-1-2, and constitutes a technical revision. The most significant changes with respect to the previous edition include the following modifications.