This Standard specifies the specific requirements for the construction, testing and marking of electrical apparatus with type of protection "increased safety "e"" intended for use in explosive gas atmospheres. These specific requirements are additional to the general requirements in EN 50014 which are applicable to type of protection "e". This European Standard applies to electrical apparatus with a rated value of supply voltage not exceeding 11 kV (d.c. or a.c. r.m.s.) that does not produce in normal operation sparks, arcs, or dangerous temperatures. Potentially explosive atmospheres include the presence of combustible dusts for Group I equipment. Except where otherwise stated in the supplementary standards, this standard and the related standards provide protection in accordance with Category 2 or Category M2.