Use in Hazardous Environments • 219
Classification Meeting CENELEC and IEC
WAGO-I/O-SYSTEM 750
Linux Fieldbus Coupler
Explosive areas resulting from gases, fumes or mist:
• Zone 0 areas are subject to an explosive atmosphere
(> 1000 h /year) continuously or for extended periods.
• Zone 1 areas can expect the occasional occurrence of an explosive
atmosphere (> 10 h ≤ 1000 h /year).
• Zone 2 areas can expect the rare or short-term occurrence of an explosive
atmosphere (> 0 h ≤ 10 h /year).
Explosive areas subject to air-borne dust:
• Zone 20 areas are subject to an explosive atmosphere
(> 1000 h /year) continuously or for extended periods.
• Zone 21 areas can expect the occasional occurrence of an explosive
atmosphere (> 10 h ≤ 1000 h /year).
• Zone 22 areas can expect the rare or short-term occurrence of an explosive
atmosphere (> 0 h ≤ 10 h /year).
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