LST EN 62052-21-2005 Electricity metering equipment (a.c.). General requirements, tests and test conditions. Part 21: Tariff and load control equipment (IEC 62052-21:2004)
LST EN 61037+A1+A2+AC-2000 partiallyLST EN 61038+A1+A2+AC-2000 partially
LST EN 62052-21-2005 history
2005LST EN 62052-21-2005 Electricity metering equipment (a.c.). General requirements, tests and test conditions. Part 21: Tariff and load control equipment (IEC 62052-21:2004)