COMPARISON OF ZONES & DIVISIONS

Classified

area

Z0

D1

Z1

Z2

D2

Time that haz. gases are present in ignitable

Estimated % (Divisions)

Estimated % (Z)

Continuously

Normally present

Occasionally in normal operations

Not normally present

ɝ%

ᢗ%

ɚ%

ᡴ%

ម%

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