Measuring transformers

Rules on metrological requirements for measuring transformers

These Rules lay down the metrological and related technical requirements that must be met by current and voltage measuring transformers of accuracy classes 0.1, 0.2, 0.2S, 0.5 and 0.5S (hereinafter “measuring transformers”) used for electricity billing together with electricity meters in AC circuits with a frequency of 50 Hz up to a voltage of 38 kV, conformity assessment procedures, verification and marking method.