Explosion Protection – Device Groups for More Safety

WAGO in Explosion Protection

Principles of Explosion Protection

Everything worth knowing about Ex protection at a single glance.

Dividing the Device Groups

Group I: Devices for mines susceptible to firedamp.
Group II: Devices for use in area subject to gas explosion (not mines)
Group III: Devices for use in areas with flammable dust (not mines)

The electrical devices of Group II are also subdivided into the groups IIA, IIB, and IIC, depending on the type of atmosphere subject to explosion. This assignment affects the ignition protection types pressure-proof encapsulation (Ex d) and intrinsically safe (Ex i).

Devices for areas with flammable dust are also subdivided into the following groups depending on the type of dust:

Flammable lint
Non-conductive dust
Conductive dust

Device Division

Group	Gas	Maximum experimental safe gap MESG	Minimum ignition current MIC
IIA	Propane	> 0.9 mm	> 0.8
IIB	Ethylene	0.5 … 0.9 mm	0.45 … 0.8
IIC	Hydrogen	< 0.5 mm	< 0.45

Customer Applications: Explosion Protection

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In bituminous coal mining, only equipment with no danger of ignition is permitted. That’s why HAZEMAG & EPR relies on WAGO Controllers.

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