2021BS EN IEC 62053-21:2021+A11:2021 Electricity metering equipment. Particular requirements. Static meters for AC active energy (classes 0,5, 1 and 2)
2018BS EN 62053-21:2003+A1:2017 Electricity metering equipment (a.c.). Particular requirements-Static meters for active energy (classes 1 and 2)
2003BS EN 62053-21:2003 Electricity metering equipment (a.c.) - Particular requirements - Static meters for active energy (classes 1 and 2)