Explosion Protection Group - WAGO LONWORKS 750-319 Manual

Explosive areas resulting from gases, fumes or mist:
Zone 0 areas are subject to an explosive atmosphere
Zone 1 areas can expect the occasional occurrence of an explosive atmos-
Zone 2 areas can expect the rare or short-term occurrence of an explosive at-
Explosive areas subject to air-borne dust:
Zone 20 areas are subject to an explosive atmosphere
Zone 21 areas can expect the occasional occurrence of an explosive atmos-
Zone 22 areas can expect the rare or short-term occurrence of an explosive

6.3.2 Explosion protection group

In addition, the electrical components for explosive areas are subdivided into
two groups:
Group I:
Group II:
Minimal ignition energy of representative types of gases
Explosion group
Gases
Ignition energy (µJ)
WAGO-I/O-SYSTEM 750
Busklemmen
(> 1000 h /year) continuously or for extended periods.
phere (> 10 h ≤ 1000 h /year).
mosphere (> 0 h ≤ 10 h /year).
(> 1000 h /year) continuously or for extended periods.
phere (> 10 h ≤ 1000 h /year).
atmosphere (> 0 h ≤ 10 h /year).
Group I includes electrical components for use in fire-damp
endangered mine structures.
Group II includes electrical components for use in all other
explosive environments. This group is further subdivided by
pertinent combustible gases in the environment.
Subdivision IIA, IIB and IIC takes into account that differ-
ent materials/substances/gases have various ignition energy
characteristic values. For this reason the three sub-groups
are assigned representative types of gases:
IIA – Propane
IIB – Ethylene
IIC – Hydrogen
I
Methane
280
Use in Hazardous Environments
IIA IIB
Propane Ethylene
250 82
• 119
IIC
Hydrogen
16