摘要：For placing electrical equipment that is protected by pressurized casings type of protection on the European market and for its use in spaces classified as explosive atmospheres, they must be evaluated and tested in accordance to relevant standards. The paper aims at presenting the peculiarities regarding the evaluation of large-scale equipment for explosive atmospheres. The first part of the paper refers to general requirements for large electrical equipment intended for use in explosive atmospheres. The requirements of pressurized casings type of protection and its technical principle of protection are shown in Part Two. As a conclusion, it has been pointed out that the disadvantage of energy consumed to provide protection to explosion provides the benefit of protection to explosion for large or complex structure equipment for which no other protection to explosion method can be applied.
