Plugs, socket-outlets and couplers for industrial purposes. General requirements|Screws (bolts), Ratings, Type testing, Damp-air tests, Breaking capacity, Low-voltage equipment, Watertightness tests, Copper alloys, Electrical connections, Industrial, Rated voltage, Dimensions, Rated current, Classification systems, Electric sockets, Flexible conductors, Interlocks, Electric cables, Temperature rise, Dielectric-strength tests, Circuits, Electric connectors, Copper, Cable junctions, Marking, Size, Thermal resistance, Temperature, Test equipment, Testing conditions, Electrical safety, Corrosion resistance, Fire resistance, Earthing, Corrosion tests, Endurance testing, Clearance distances, Electric terminals, Electrical testing, Heat ageing tests, Mechanical testing, Thermal testing, Electric plugs, Electric contacts, Electromagnetic compatibility, Protected electrical equipment, Low-temperature testing