Connecting devices. Electrical copper conductors. Safety requirements for screw-type and screwless-type clamping units. Part 1. General requirements and particular requirements for clamping units for conductors from 0,2 up to 35 sq. mm (included)
State system for insuring the uniformity of measurements. Secondary standards of units of mass and volumetric flow rate, mass and volume fluid. General metrological and technical requirements
