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WAGO in Explosion Protection Recommended Reading
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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.

Zone Divisions in North America

In North America, a different classification system based on the standards NEC 500 and NEC 505 is applied. Here, flammable substances are divided into three classes (Classes I to III). Explosive gases, vapors and mists of Class I are subdivided into the gas groups A, B, C and D; flammable dusts of Class II into the groups E, F and G.

Depending on the frequency or duration of occurrence of these materials, the hazardous locations are divided into so-called divisions. Division 1 corresponds to Zones 0 and 1 and Division 2 to Zone 2. In addition to the division of the explosive areas, the construction of the operating equipment and installation of the electrical systems are also differentiated.

Overview of the Gas Groups

Gas group (group)Material examples
AAcetylene
BHydrogen
CEthylene
DPropane
EMetal dust
FCoal dust
GGrain dust

Read More Here

What happens during an explosion, which factors are important, and what protective measures are available? Everything you need to know about ATEX, Ex zones, ignition protection categories, etc.

Directives, Standards and Regulations

The requirements for electrical equipment for hazardous locations are multi-layered: National and international determinations, guidelines and standards must be complied with to achieve the highest possible level of safety. We give you an overview of the most important regulations and recommendations, such as the ATEX directive.
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Device Groups

Like the devices, gases, vapors, and dust are divided into various groups according to their properties. This division simplifies the right selection of devices for the various gases, vapors, and dusts.
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Ex Protection Measures

Who needs explosion protection? To whom does explosion protection apply? What must be noted here? And what is constructive explosion protection? WAGO has compiled answers to the most important questions for you.
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WAGO Products for Explosion Protection

Your WAGO Contact

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Recommended Reading

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