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