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Hazardous Area Classification of electrical apparatus for explosive gas atmosphe

Zone 0 In this areas, explosive atmosphere appears continously and exist in a long perios
Zone 1 In this areas, explosive atmosphere is likely madbe pre-scent under normal operation
Zone 2 In this areas, explosive atmosphere is likely madbe pre-scent under normal operation
Max surface temperature classification of II class electrical apparatus

Temperature Classification Max Surface Temperature(degree)
T1 450
T2 300
T3 200
T4 35
T5 100
T6 85