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Lamp controlgear - Particular requirements for d.c. or a.c. supplied electronic step-down convertors for filament lamps Ingestion-build-63436 BS EN 12760 is a1 Scope This part of IEC 61347 specifies particular safety requirements for electronic step down convertors for use on d. c. supplies of up to 250 V or a. c. supplies of up to 1 000 V, at 50 Hz or 60 Hz and with rated output voltage @pound @ 50 V r. m. s. at a frequency deviating from the supply frequency, or 120 V ripple free d. c. between conductors and between any conductor and earth, associated with tungsten halogen lamps as specified in IEC 60357