State system for ensuring the uniformity of measurements. Density of petroleum. Requirements to methods of measurement by hydrometers during metering operations
Low-voltage switchgear and controlgear. Part 4-2. Contactors and motor-starters. AC semiconductor motor controllers and starters for AC electric motors
Electromagnetic compatibility of technical equipment. Limitation of voltage fluctuation and flicker, caused by technical equipment with rated current greater than 75 A connected to low-voltage power supply systems. Limits and test methods