Bl This standard refers to tungsten filament electric lamps with clear transparent glass bulbs, natural white or internally frosted, intended for lighting in the rolling stock of railways and trams. B-2 This standard covers the types of lamps detailed below, whose characteristics are established in the following sections: a) 24 V lamps for interior lighting of trains: Section I. b) Gas lamps to operate in series: Section II. c) Vacuum lamps to operate in series: Section III.
IRAM 2055-1947 history
1947IRAM 2055-1947 Tungsten filament electric lamps for trams