Signs and luminous-discharge-tube installations operating from a no-load rated output voltage exceeding 1 kV but not exceeding 10 kV. Requirements for earth-leakage and open-circuit protective devices|Lighting systems, Electrical protection equipment, Electrical installations, Electric wires, Voltage, Advertising signs, Discharge lamps, Electrical safety, Electrical testing, Electrical components, Performance testing, Electrical equipment, Sign lighting (buildings), Electrically-operated devices, Installation, Earth-leakage circuit-breakers, Rated voltage, Decorative lighting, Signs