Russian standards PDF
International Electrotechnical Vocabulary. Electrical and electronic measurements and measuring instruments. Part 311. General terms relating to measurements. Part 312. General terms relating to electrical measurements. Part 313. Types of electrical measuring instruments. Part 314. Specific terms according to the type of instrument
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Plugs, socket-outlets and couplers for industrial purposes. Part 1. General requirements
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Low-voltage switchgear and controlgear. Part 5-1. Control circuit devices and switching elements. Electromechanical control circuit devices
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Electromechanical elementary relays. Part 7. Test and measurement procedures
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Liquid pumps and installation. General terms, definitions, quantities, letter symbols and units. Part 1. Liquid pumps
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