Within a group of units, the categorySee: Device Category defines the classification with regard to the required level of safety. The device categoryWithin a group of units, the category defines the classification with regard to the required level of safety. The device category indicates the technical requirements placed on a device for the individual Ex zone. indicates the technical requirements placed on a device for the individual Ex zone. The categories are defined as follows:
Category 1 encompasses devicesMachines, equipment, stationary or mobile devices, control and equipment parts as well as warning and preventions systems, intended either individually or in combination for the generation, transmission, storage, measurement, control and conversion of energy and/or to process materials, and which... the design of which is such that they can be operated in conformity with the characteristic values specified by the manufactured and guarantee a very high degree of safety.
Category 2 encompasses devices the design of which is such that they can be operated in conformity with the characteristic values specified by the manufactured and guarantee a high degree of safety.
Category 3 encompasses devices the design of which is such that they can be operated in conformity with the characteristic values specified by the manufactured and guarantee a normal degree of safety.
