This European standard specifies the requirements for the design and construction of non-electrical equipment, intended for use in potentially explosive atmospheres, protected by the type of protection Constructional Safety "c". This standard supplements the requirements in EN 13463-1, the contents of which also apply in full to equipment constructed in accordance with this standard. Equipment complying with the relevant clauses of this standard meet the requirements for the following categories: Equipment Group I Category M2; Equipment Group II Category 2G or 2D; Equipment Group II Category 1G or 1D; NOTE The requirements for Group I, Category M1 equipment, are given in EN 50303 which specifies the requirements for both electrical and non-electrical equipment. The type of ignition protection described in the standard can be used either on it's own or in combination with other types of ignition protection to meet the requirements for equipment of Group I, categories M1 and M2 or Group II, categories 1 and 2 depending on the ignition hazard assessment in EN 13463-1.