Boxes and enclosures for electrical accessories for household and similar fixed electrical installations. Part 21. Particular requirements for boxes and enclosures with provision for suspension means
Occupational safety standards system. Cubicles of factory-assembled switch-gears and of complete transformer substations, cubicles of metal-enclosed switchgear and of unit transformer substation
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
€10
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