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See Chinese contents: GB/T 17215.321-2021 GB/T 17215.321-2021: Electricity metering equipment (AC) - Particular requirements - Part 21: Static meters for active energy(classes A, B, C, D and E)
This Part of GB/T 17215.3 specifies the standard electricity value, structure, meter marking and documentation, metering performance, climate environment, external influence, metering performance protection, electrical requirements, for static meters for active energy.
