Connecting devices. Safety requirements for clamping units. Part 2. Particular requirements for screw-type and screwless-type clamping units for copper conductors above 35 mm2 up to 300 mm2 (included)
State system for ensuring the uniformity of measurements. Certified reference materials of gas mixtures with Nitrogen oxide, Nitrogen dioxide, Hydrogen sulfide, Sulfur dioxide, Ammonia. Procedure of determining the metrological characteristics
