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TEHLİKELİ BÖLGELERİN SINIFLANDIRILMASI ( Classification of Hazardous Zones) Zone 1 - Group IIA class T3 ATEX apparatus cat. 1 or 2 Zone 2 - Group IIA class T3 ATEX apparatus cat. 1 or 2 or 3 Zone 0 An Area Where an explosive atmosphere is present continuously for long periods Zone 1 An Area Where an explosive atmosphere is likely to occur in normal operation Zone 2 An Area Where an explosive atmosphere is not likely to occur in normal operation Vent Island Non-Hazardous zone Vapaur barrier type 2 Vapaur barrier type 1 h = 150 ( Min ) . 200 IP 67 Head 50 Vent 200 50 Vent IP 54 IP 54 26