Signs and luminous-discharge-tube installations operating from a no-load rated output voltage exceeding 1 kV but not exceeding 10 kV -- Part 2: Requirements for earth-leakage and open-circuit protective devices
空载额定输出电压超过1kV但不超过10kV的标志和发光放电管装置第2部分:漏电和开路保护装置的要求