Fluorescent lamps complying with this standard are, in the main, intended to be used in potentially explosive atmospheres. In connection with Fa6 lampholders according to DIN 49658," they can be used in flameproof luminaires of the type of protection ""increased safety"".; Fluorescent lamps are in general connected to a rated voltage of 220 V a.c. through ballasts which shall be constructed in accordance with the relevant VDE specification.#",,#
DIN 49659:1986 history
1986DIN 49659:1986 Fluorescent lamps, non preheated for potentially explosive atmospheres