1954 Edition, November 25, 1954
Specification for Air-cooled flameproof single-phase lighting transformer units supplied from high voltage systems
Includes all amendments and changes through Change/Amendment , November 25, 1954
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Description / Abstract:
Transformer units for supply voltages of 2200, 2750 or 3300 volts with ratings of 2.5 kVA and 5 kVA mainly for roadway lighting in mines. It specifies standard voltages, ratings, provision for earthing, primary isolating switch, protective fuses, particulars of temperature limits and a series of tests.