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Zone Division per ATEX and NEC 500

Depending on the type of materials that occur, hazardous locations are not equally at risk. The frequency and duration of occurrence of one of these substances give rise to the different protective requirements for operating equipment.


According to CENELEC and IEC, hazardous locations in Europe are divided into six different danger zones. The higher the probability that a potentially explosive atmosphere occurs, the more rigorous the requirements on operating equipment to prevent, for example, origination of sparks or hot surfaces.

WAGO in Explosion Protection

Principles of Explosion Protection

Everything worth knowing about Ex protection at a single glance.

Device Categories and Groups

Which resources are permitted for use in a zone can be derived from the specific operating equipment and in dependence on the zone allocation. In order to specify for which zone specific operating equipment may be used, the device group and category are relevant. The explosion protection zone in which the operating equipment may be operated is defined based on temperature classes and explosion groups.