Explore A Comprehensive Guide to ZONE 0, ZONE 1, ZONE 2, and Zone 3 in Hazardous Areas. The most common values used are Zone 0: Explosive atmosphere for more than 1000h/yr. Zone 1: Explosive atmosphere for more than 10, but less than 1000 h/yr. Zone 2: Explosive atmosphere for less than 10h/yr, but still sufficiently likely as to require controls over ignition sources.
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