This document contains requirements for the metrological control of electricity meters intended for use for trade. It specifies the metrological and technical requirements for the pattern approval and verification of active-energy electricity meters of accuracy classes 0.2, 0.5, 1 and 1.5. The requirements apply to all watt hour meters used for single-rate or multi-rate operation, in single or polyphase installations, having a nominal operating frequency of 50 Hz and a connection voltage not exceeding 600 V.
It is Australian Government policy to harmonise Australian standards with international metrological requirements to the greatest possible extent. For regulatory measurements, the relevant international standards are the recommendations of the International Organisation of Legal Metrology (OIML). Currently NMI is working closely with OIML to produce a new international recommendation for electricity meters which we will adopt once it is published. In the meantime, this document should be used for pattern approval purposes.
The scope of this document is restricted to the metrological requirements of active-energy static electricity meters of classes 0.2, 0.5, 1 and 1.5. Future editions may include meters which measure apparent and/or reactive energy. Only those non-metrological requirements which have an impact on metrology are included in this document.
Metrological requirements have been aligned for the most part with the requirements in AS/IEC 62052.11, AS/IEC 62053.21, AS/IEC 62053.22 and AS 1284.1. The requirements for general purpose static watt hour meters in AS 1284.5 have not been explicitly included because the standard is limited to class 1 meters and has been superseded by AS 62053.21 mentioned above. See Annex B for a list of the main differences between this document and the AS/IEC standards. Please note that all references to AS/IEC standards are to the specific editions cited.
Australian Government-National Measurement Institute
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