IEC 60034-18-41:2014 defines criteria for assessing the insulation system of stator/rotor windings which are subjected to voltage-source pulse-width-modulation drives. It applies to stator/rotor windings of single or polyphase AC machines with insulation systems for converter operation. It describes qualification tests and quality control (type and routine) tests on representative samples or on completed machines which verify fitness for operation with voltage source converters.