1.1 This European Standard contains the specific requirements for the construction and testing of oil-immersed electrical apparatus, type of protection 'o', intended for use in potentially explosive atmospheres.
1.2 This European Standard supplements European Standard EN 50 014 'General requirements', the requirements of which apply to oil-immersed electrical apparatus.
1.3 For electrical apparatus of Group I this European Standard applies only to switching and isolatingdevices whose construction is permitted by 17.1 of European Standard EN 50 014 'General requirements'.
NOTE. This European Standard assumes that the electrical apparatus immersed in oil is fixed in its operating position in accordance with the installation instructions.