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IEC/TC 2/WG 31
Efficiency classes
IEC/TC 13 PT 62053-24
Electricity metering equipment (AC) - Particular requirements - Part 24: Static meters for reactive energy (classes 0,5 and 1)
CLC/SR 3D
Product properties and classes and their identification
IEC/SC 3D/PT 61360-7
Classes and properties for cross-domain via IEC CDD.