Low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Electrical safety. Equipment for testing, measuring or monitoring of protective measures. Part 6. Residual current operated protective devices in TT, TN and IT systems
State system for ensuring the uniformity of measurements. Standard reference data. The density and thermal expansion of liquid lithium-lead alloys in the temperature range from the liquidus line to 1050 K and in the concentration range from 10 at. % to 84.3 at. % Pb
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