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≤ 450°C)T2 (

7.3 Classification of Hazardous Locations in North America

≤ 300°C)T3 ( Table 19: Classification of Hazardous Locations in North America Gases, vapors or mistsDustsFibres and flyingsClassification Class I ≤ 200°C)T4 ( NEC 500-5 CEC J18-004Division 1 Locations where ignitible concen- trations of flammable gases or vapors can exist under normal operating conditions as well as frequently because of repair or maintenance operations or because of leakage. Division 2 Locations where ignitible concen- trations of flammable gases or vapors can exist under abnormal operating conditions.Class I GroupsNEC 500-3 CEC J18-050Division 1 and 2 A (Acetylene) B (Hydrogen) C (Ethene) D (Propane)Class I Temperature classes Division 1 and 2T1 ( ≤ 135°C) T5 ( ≤ 100°C) T6 ( ≤ 85°C) NEC 500-6 CEC 18-008 Division 1Locations where ignitible concen- trations of combustible dust is in the air under normal operating conditions. Division 2 Locations where ignitible concen- trations of combustible dust is in the air under abnormal operating conditions.Class II GroupsNEC 500-3 CEC J18-050Division 1 and 2 E (Metal) F (Coal) G (Grain)Class II Temperature classes Division 1 and 2T1 ( ≤ 450°C, 842°F)T2 ( ≤ 300°C, 572°F)T2A, T2B, T2C, T2D ( ≤ 280°C, ≤ 260°C, ≤ 230°C, ≤ 215°C)(536°F, 500°F, 446°F, 419°F)T3 ( ≤ 200°C, 392°F)T3A, T3B, T3C ( ≤ 180°C, ≤ 165°C, ≤ 160°C)(356°F, 329°F, 320°F)T4 ( ≤ 135°C, 275°F) T4A ( ≤ 120°C, 248°F) T5 ( ≤ 100°C, 212°F) T6 ( ≤ 85°C, 185°C) NEC 505-7 CEC 18-006Zone 0 Locations where ignitible concen- trations of flammable gases orvapors are present continuously or for long periods of time.Zone 1 Locations where ignitable concen- trationsofflammable gases or vapors are likely to exist under nor- mal operating conditions or may exist frequently because of repair or maintenance or because of leakage. Zone 2 Locations where ignitible concen- trations of flammable gases or vapors are not likely to occur in normal operation, and if they do, will exist only for a short period. NEC 505-7 CEC J18-050Zone 0, 1 and 2 IIC (Acetylene + Hydrogen) IIB (Ethene) IIA (Propane) Zone 0, 1 and 2 T1 ( ≤ 450°C, 842°F)T2 ( ≤ 300°C, 572°F)T2A, T2B, T2C, T2D ( ≤ 280°C, ≤ 260°C, ≤ 230°C, ≤ 215°C)(536°F, 500°F, 446°F, 419°F)T3 ( ≤ 200°C, 392°F)T3A, T3B, T3C ( ≤ 180°C, ≤ 165°C, ≤ 160°C)(356°F, 329°F, 320°F)T4 ( ≤ 135°C, 275°F) T4A ( ≤ 120°C, 248°F) T5 ( ≤ 100°C, 212°F) T6 ( ≤ 85°C, 185°C) Fibres and flyings Classification Class III Division 1Locations where easily ignitible fibres or materials producing combustible flyings are handled, manufactured or used. Division 2 Locations where easily ignitible fibres and materials producing combustible flyings are stored or handled other than in the process of manufacture.Class IIIDivision 1 and 2 noneClass III Temperature Division 1 and 2none R.STAHL explosion protection