Specifies particular requirements for the type test of newly manufactured indoor time switches with operation reserve that are used to control electrical loads, multi-tariff registers and maximum demand devices of electricity metering equipment
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IEC 62054-21 Ed. 1.0 en:2004
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Electricity metering (a.c.) – Tariff and load control – Part 21: Particular requirements for time switches
International Electrotechnical Commission , 05/18/2004
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