State system for ensuring the uniformity of measurements. State verification scheme for measuring instruments of the water solutions ion content by electrochemical methods (pX measuring instruments)
Low-voltage electrical distribution network up to 1000 V a.c. and 1500 V d.c. Electrical safety. Equipment for testing, measuring or monitoring of protective measures. Part 6. Effectiveness of residual current devices (RCD) in TT, TN and IT systems
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