IEC 60491:1974

Applies to the following electronic flash apparatus for photographic purposes, having a stored energy not exceeding 2 000 J, together with associated apparatus and not intended to be subjected to dripping or splashing: apparatus of the single flash type; apparatus for the illumination of sequential photographic exposures; battery chargers and supply units to be used in connection with electronic flash apparatus for photographic purposes; accessories, such as light regulators and slave units.