BS EN IEC 62271-203. High-voltage switchgear and controlgear. Part 203. Gas-insulated metal-enclosed switchgear for rated voltages above 52 kV|Electrical equipment, Safety devices, Type testing, Artificial weathering tests, Leak tests, Rated voltage, Design, Electrical protection equipment, Non-destructive testing, Pressure testing, Short-circuit current tests, Rated frequencies, Relief valves, Protected electrical equipment, Temperature rise, Electrical testing, Marking, Gases, Type p protected electrical equipment, Circuits, Thermal testing, Impulse-voltage tests, Endurance testing, Ratings, Selection, Verification, Field testing, Earthing, Test equipment, Electric control equipment, Electric enclosures, Insulating enclosures, Testing conditions, Rated current, Watertightness tests, Switchgear, Dielectric-strength tests, High-voltage equipment