Use in Hazardous Environments ï 219Classification Meeting CENELEC and IECWAGO-I/O-SYSTEM 750Linux Fieldbus CouplerExplosive 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 explosiveatmosphere (> 10 h ≤ 1000 h /year).• Zone 2 areas can expect the rare or short-term occurrence of an explosiveatmosphere (> 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 explosiveatmosphere (> 10 h ≤ 1000 h /year).• Zone 22 areas can expect the rare or short-term occurrence of an explosiveatmosphere (> 0 h ≤ 10 h /year).
