IEC61851-21-1:2017(E), together with IEC61851-1:2010, 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 IEC61851-21-2, cancels and replaces IEC61851-21:2001. It constitutes a technical revision. This edition includes the following significant technical changes with respect to IEC61851‑21:2001: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.