Motors are directly connected to the machines in the potentially explosive atmosphere. These atmospheres have a defined zone classification, and the zone defines the minimum safety level (category) the motors must comply with. The category defines the permitted motor protection types.
Motors can also be classified by Equipment Protection Levels (EPL) according to the IEC/EN standards. The EPL indicates a motor’s inherent risk of ignition. The purpose of this classification is to make the selection of motors for different zones easier.
For motors, EPL marking is included in the Ex marking, equipment category is included in the CE-marking.
Classification into categories is of particular importance, because all the inspection, maintenance and repair duties of the end user will depend on the category of the product/equipment and not on the zone where it is installed.