IEC 62052-21:2004/AMD1:2016/COR1:2018 Corrigendum 1 - Amendment 1 - Electricity metering equipment (A.C.) - General requirements, tests and test conditions - Part 21: Tariff and load control equipment
2018IEC 62052-21:2004/AMD1:2016/COR1:2018 Corrigendum 1 - Amendment 1 - Electricity metering equipment (A.C.) - General requirements, tests and test conditions - Part 21: Tariff and load control equipment
2016IEC 62052-21:2004/AMD1:2016 Electricity metering equipment (a.c.) - General requirements, tests and test conditions - Part 21: Tariff and load control equipment; Amendment 1
2004IEC 62052-21:2004 Electricity metering equipment (a.c.) - General requirements, tests and test conditions - Part 21: Tariff and load control equipment