1.1 This European Standard contains the 'General requirements' for the construction and testing of electrical apparatus for use in potentially explosive atmospheres in order to ensure that such apparatus will not cause an explosion of the surrounding atmosphere. It is supplemented or modified by the following European Standards, concerning the specific standard types of protection:
EN 50 015: Oil immersion 'o'
EN 50 016: Pressurized apparatus 'p'
EN50 017:Powderfilling'q'
EN 50 018: Flameproof enclosure 'd'
EN 50 019: Increased safety 'e'
EN 50 020: Intrinsic safety 'i'
1.2 The above European Standards and this European Standard are not applicable to the construction of electro-medical apparatus,
exploders, test devices for exploders and for shotfiring circuits.
1.3 Devices in which, according to the manufacturer's specifications, none of the values 1.2 V, 0.1 A, 20 mJ or 25 mW is exceeded need not be certified or marked.