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: Up to 20 kHz (often used for high-accuracy 0.1-WB2 classes).

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: Define "Special Service Conditions" early if the unit will face extreme altitudes (>1000m) or high pollution levels. 🔗 Procurement & Official Resources IEC 61869 Standards Overview | PDF | Transformer - Scribd : Up to 20 kHz (often used for high-accuracy 0

: LV systems (≤1 kV AC / ≤1.5 kV DC) are now covered separately under IEC 61869-201 . iec 618691 pdf best