IEC 62054-21:2004/AMD1:2017/COR1:2018
Corrigendum 1 - Amendment 1 - Electricity metering (A.C.) - Tariff and load control - Part 21: Particular requirements for time switches
Corrigendum 1 - Amendement 1 - Equipement de comptage de l'électricité (C.A.) - Tarification et contrôle de charge - Partie 21: Exigences particulières pour les horloges de tarification
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Mandatory Standard according current regulation