State system for ensuring the uniformity of measurements. National standard. Standard reference data. Segnetoelectric ceramic materials based on niobates of sodium and potassium. Dielectric and piezoelectric characteristics at temperatures from 0°C to 100°C
Power cables with extruded insulation and their accessories for rated voltages above 30 kV (Um = 36 kV) up to 150 kV (Um = 170 kV). Test methods and requirements
