IEC 61851-21-1:2017(E), together with IEC 61851-1:2010, gives requirements for conductive connection of an electric vehicle (EV) to an AC or DC supply. It applies only to on-board charging units either tested on the complete vehicle or tested on the charging system component level (ESA - electronic sub assembly). This document covers the electromagnetic compatibility (EMC) requirements for electrically propelled vehicles in any charging mode while connected to the mains supply. This first edition, together with IEC 61851-21-2, cancels and replaces IEC 61851-21:2001. It constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC 61851-21:2001: a) this document addresses now only EMC tests instead of other electrical tests; b) test setups are defined more precisely; c) Annex A "Artificial networks, asymmetric artificial networks and integration of charging stations into the test setup" was added.