CEI EN 62058-31 Ed. 2 (2012)現行
Electricity Metering Equipment (A.C.) - Acceptance Inspection - Part 31: Particular Requirements For Static Meters For Active Energy (Classes 0,2 S, 0,5 S, 1 And 2, And Class Indexes A, B And C)
出版：Comitato Elettrotecnico Italiano
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