Heat recovery ventilators and energy recovery ventilators - Testing and calculating methods for seasonal performance factor - Part 3: Annual sensible heating and cooling recovery performance factor of heat recovery ventilators

Heat recovery ventilators and energy recovery ventilators - Testing and calculating methods for seasonal performance factor - Part 2: Sensible cooling recovery seasonal performance factors of heat recovery ventilators

Power capacitors - Low-voltage power factor correction banks (IEC 33/589/CDV:2016); German version prEN 61921:2016

Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals

Electrical measuring transducers for converting AC and DC electrical quantities to analogue or digital signals (IEC 85/748/CDV:2021); German and English version prEN IEC 60688:2021