25. National Standard of Electrical Power and Energy at Industrial Frequencies
ECM 220-1/03-025 - Announcement (PDF 271 kB)
ECM 220-1/03-025 - change 1 (PDF 18 kB)
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ECM 220-1/03-025 - Announcement (PDF 271 kB)
ECM 220-1/03-025 - change 1 (PDF 18 kB)
Click to view full size image