| {"basis": "Risk gradation", "category": "system attribute", "derived_fields": ["category"], "id": "3-levels-zone-0-1-2-system-attribute-2-levels-div-1-div-2", "iec_designation": "3 levels (Zone 0, 1, 2)", "north_american_designation": "2 levels (Div 1, Div 2)", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Risk gradation | 2 levels (Div 1, Div 2) | 3 levels (Zone 0, 1, 2) | 3 levels (Zone 0, 1, 2)", "url": "https://referencesource.org/ex-classification-system-crosswalk/3-levels-zone-0-1-2-system-attribute-2-levels-div-1-div-2/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Flame Proof", "category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-d", "iec_standard": "ISA 60079-1", "north_american_designation": "AEx d", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Flame Proof AEx d US Class I Zone 1 ISA 60079-1", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-d/", "verified_fields": ["basis", "country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Increased Safety", "category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-e", "iec_standard": "ISA 60079-7", "north_american_designation": "AEx e", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Increased Safety AEx e US Class I Zone 1 ISA 60079-7", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-e/", "verified_fields": ["basis", "country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Intrinsic Safety", "category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 0", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-ia", "iec_standard": "ISA 60079-11", "north_american_designation": "AEx ia", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Intrinsic Safety AEx ia US Class I Zone 0 ISA 60079-11", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-ia/", "verified_fields": ["basis", "country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 20", "id": "us-protection-concept-aex-iad", "iec_standard": "ISA 61241-11", "north_american_designation": "AEx iaD", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx iaD US Zone 20 ISA 61241-11", "url": "https://referencesource.org/ex-classification-system-crosswalk/us-protection-concept-aex-iad/", "verified_fields": ["country", "division_or_zone", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-ib", "iec_standard": "ISA 60079-11", "north_american_designation": "AEx ib", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx ib US Class I Zone 1 ISA 60079-11", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-ib/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Intrinsic Safety", "category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 21", "id": "us-protection-concept-aex-ibd", "iec_standard": "ISA 61241-11", "north_american_designation": "AEx ibD", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Intrinsic Safety AEx ibD US Zone 21 ISA 61241-11", "url": "https://referencesource.org/ex-classification-system-crosswalk/us-protection-concept-aex-ibd/", "verified_fields": ["basis", "country", "division_or_zone", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-m", "iec_standard": "ISA 60079-18", "north_american_designation": "AEx m", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx m US Class I Zone 1 ISA 60079-18", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-m/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 0", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-ma", "iec_standard": "ISA 60079-18", "north_american_designation": "AEx ma", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx ma US Class I Zone 0 ISA 60079-18", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-ma/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "derived_fields": ["category"], "division_or_zone": "Zone 20", "id": "protection-concept-aex-mad", "iec_standard": "ISA 61241-18", "north_american_designation": "AEx maD", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx maD Zone 20 ISA 61241-18", "url": "https://referencesource.org/ex-classification-system-crosswalk/protection-concept-aex-mad/", "verified_fields": ["division_or_zone", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-mb", "iec_standard": "ISA 60079-18", "north_american_designation": "AEx mb", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx mb US Class I Zone 1 ISA 60079-18", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-mb/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 21", "id": "us-protection-concept-aex-mbd", "iec_standard": "ISA 61241-18", "north_american_designation": "AEx mbD", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx mbD US Zone 21 ISA 61241-18", "url": "https://referencesource.org/ex-classification-system-crosswalk/us-protection-concept-aex-mbd/", "verified_fields": ["country", "division_or_zone", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 2", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-na", "iec_standard": "ISA 60079-15", "north_american_designation": "AEx nA", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx nA US Class I Zone 2 ISA 60079-15", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-na/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Enclosed Break", "category": "protection concept", "country": "US", "derived_fields": ["category"], "disagreements": [], "division_or_zone": "Zone 2", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-nc", "iec_standard": "ISA 60079-15", "north_american_designation": "AEx nC", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Enclosed Break AEx nC US Class I Zone 2 ISA 60079-15", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-nc/", "verified_fields": ["basis", "country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 2", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-nr", "iec_standard": "ISA 60079-15", "north_american_designation": "AEx nR", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx nR US Class I Zone 2 ISA 60079-15", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-nr/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Oil Emmersion", "category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-o", "iec_standard": "ISA 60079-6", "north_american_designation": "AEx o", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Oil Emmersion AEx o US Class I Zone 1 ISA 60079-6", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-o/", "verified_fields": ["basis", "country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 21", "id": "us-protection-concept-aex-pd", "iec_standard": "ISA 61241-2", "north_american_designation": "AEx pD", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx pD US Zone 21 ISA 61241-2", "url": "https://referencesource.org/ex-classification-system-crosswalk/us-protection-concept-aex-pd/", "verified_fields": ["country", "division_or_zone", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-px", "iec_standard": "ISA 60079-2", "north_american_designation": "AEx px", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx px US Class I Zone 1 ISA 60079-2", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-px/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-py", "iec_standard": "ISA 60079-2", "north_american_designation": "AEx py", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx py US Class I Zone 1 ISA 60079-2", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-py/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 2", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-pz", "iec_standard": "ISA 60079-2", "north_american_designation": "AEx pz", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx pz US Class I Zone 2 ISA 60079-2", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-pz/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Power Filled", "category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-aex-q", "iec_standard": "ISA 60079-5", "north_american_designation": "AEx q", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Power Filled AEx q US Class I Zone 1 ISA 60079-5", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-aex-q/", "verified_fields": ["basis", "country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 21", "id": "us-protection-concept-aex-td", "iec_standard": "ISA 60079-31", "north_american_designation": "AEx tD", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "AEx tD US Zone 21 ISA 60079-31", "url": "https://referencesource.org/ex-classification-system-crosswalk/us-protection-concept-aex-td/", "verified_fields": ["country", "division_or_zone", "iec_standard", "north_american_designation"]} |
| {"basis": "Flammable gases and vapors", "category": "area classification", "derived_fields": ["category"], "id": "zone-0-1-2-gas-area-classification-class-i", "iec_designation": "Zone 0, 1, 2 (gas)", "north_american_designation": "Class I", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Class I | Flammable gases and vapors", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-0-1-2-gas-area-classification-class-i/", "verified_fields": ["basis", "north_american_designation"]} |
| {"basis": "Continuous hazard", "category": "area classification", "derived_fields": ["category"], "id": "zone-0-area-classification-class-i-division-1", "iec_designation": "Zone 0", "north_american_designation": "Class I Division 1", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Continuous hazard | Class I Division 1 | Zone 0", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-0-area-classification-class-i-division-1/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Frequent hazard", "category": "area classification", "derived_fields": ["category"], "id": "zone-1-area-classification-class-i-division-1", "iec_designation": "Zone 1", "north_american_designation": "Class I Division 1", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Frequent hazard | Class I Division 1 | Zone 1", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-1-area-classification-class-i-division-1/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Occasional hazard", "category": "area classification", "derived_fields": ["category"], "id": "zone-2-area-classification-class-i-division-2", "iec_designation": "Zone 2", "north_american_designation": "Class I Division 2", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Occasional hazard | Class I Division 2 | Zone 2", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-2-area-classification-class-i-division-2/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Hazard basis", "category": "system attribute", "derived_fields": ["category"], "id": "zone-0-1-2-gas-zone-20-21-22-dust-system-attribute-class-i-gas-ii-dust-iii-fibers", "iec_designation": "Zone 0, 1, 2 (gas); Zone 20, 21, 22 (dust)", "north_american_designation": "Class I (gas), II (dust), III (fibers)", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Hazard basis | Class I (gas), II (dust), III (fibers) | Zone 0, 1, 2 (gas only) | Zone 0, 1, 2 (gas); Zone 20, 21, 22 (dust)", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-0-1-2-gas-zone-20-21-22-dust-system-attribute-class-i-gas-ii-dust-iii-fibers/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Acetylene", "category": "gas group", "derived_fields": ["category"], "id": "iic-gas-group-class-i-group-a", "iec_designation": "IIC", "north_american_designation": "Class I, Group A", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "IIC | Acetylene | Class I, Group A | Acetylene", "url": "https://referencesource.org/ex-classification-system-crosswalk/iic-gas-group-class-i-group-a/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Hydrogen", "category": "gas group", "derived_fields": ["category"], "id": "iib-h2-gas-group-class-i-group-b", "iec_designation": "IIB + H2", "north_american_designation": "Class I, Group B", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "IIB + H2 | Hydrogen | Class I, Group B | Hydrogen", "url": "https://referencesource.org/ex-classification-system-crosswalk/iib-h2-gas-group-class-i-group-b/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Ethylene", "category": "gas group", "derived_fields": ["category"], "id": "iib-gas-group-class-i-group-c", "iec_designation": "IIB", "north_american_designation": "Class I, Group C", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "IIB | Ethylene | Class I, Group C | Ethylene", "url": "https://referencesource.org/ex-classification-system-crosswalk/iib-gas-group-class-i-group-c/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Propane", "category": "gas group", "derived_fields": ["category"], "id": "iia-gas-group-class-i-group-d", "iec_designation": "IIA", "north_american_designation": "Class I, Group D", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "IIA | Propane | Class I, Group D |", "url": "https://referencesource.org/ex-classification-system-crosswalk/iia-gas-group-class-i-group-d/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Combustible dust", "category": "area classification", "derived_fields": ["category"], "id": "zone-20-21-22-dust-area-classification-class-ii", "iec_designation": "Zone 20, 21, 22 (dust)", "north_american_designation": "Class II", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Class II | Combustible dust", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-20-21-22-dust-area-classification-class-ii/", "verified_fields": ["basis", "north_american_designation"]} |
| {"basis": "Metal dusts", "category": "dust group", "derived_fields": ["category"], "id": "iiic-dust-group-class-ii-group-e", "iec_designation": "IIIC", "north_american_designation": "Class II, Group E", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "Gas / dust group | Typical Substances | IIC | Acetylene | Class I, Group A | Acetylene | IIB + H2 | Hydrogen | Class I, Group B | Hydrogen | IIB | Ethylene | Class I, Group C | Ethylene | IIA | Propane | Class I, Group D | Propane | IIIC | Conductive dust | Class II, Group E |", "url": "https://referencesource.org/ex-classification-system-crosswalk/iiic-dust-group-class-ii-group-e/", "verified_fields": ["iec_designation", "north_american_designation"]} |
| {"basis": "Carbon dusts", "category": "dust group", "derived_fields": ["category"], "id": "iiib-dust-group-class-ii-group-f", "iec_designation": "IIIB", "north_american_designation": "Class II, Group F", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "Gas / dust group | Typical Substances | IIC | Acetylene | Class I, Group A | Acetylene | IIB + H2 | Hydrogen | Class I, Group B | Hydrogen | IIB | Ethylene | Class I, Group C | Ethylene | IIA | Propane | Class I, Group D | Propane | IIIC | Conductive dust | Class II, Group E | Combustible metal dust | IIIB | Non-conductive dust | Class II, Group F |", "url": "https://referencesource.org/ex-classification-system-crosswalk/iiib-dust-group-class-ii-group-f/", "verified_fields": ["iec_designation", "north_american_designation"]} |
| {"basis": "Grain, flour, plastic dusts", "category": "dust group", "derived_fields": ["category"], "id": "dust-group-class-ii-group-g", "north_american_designation": "Class II, Group G", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "Class II, Group G", "url": "https://referencesource.org/ex-classification-system-crosswalk/dust-group-class-ii-group-g/", "verified_fields": ["north_american_designation"]} |
| {"basis": "Dust classification", "category": "system attribute", "derived_fields": ["category"], "id": "zone-20-21-22-iiia-iiib-iiic-system-attribute-class-ii-groups-e-f-g", "iec_designation": "Zone 20, 21, 22 (IIIA, IIIB, IIIC)", "north_american_designation": "Class II Groups E, F, G", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Dust classification | Class II Groups E, F, G | Not covered | Zone 20, 21, 22 (IIIA, IIIB, IIIC)", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-20-21-22-iiia-iiib-iiic-system-attribute-class-ii-groups-e-f-g/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Ignitable fibers", "category": "area classification", "derived_fields": ["category"], "id": "area-classification-class-iii", "north_american_designation": "Class III", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Class III | Ignitable fibers", "url": "https://referencesource.org/ex-classification-system-crosswalk/area-classification-class-iii/", "verified_fields": ["basis", "north_american_designation"]} |
| {"basis": "IEC considers fibers within the dust framework", "category": "dust group", "derived_fields": ["category"], "id": "dust-group-class-iii", "north_american_designation": "Class III", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Fiber hazards: NEC Class III (fibers/flyings) has no IEC equivalent. IEC considers fibers within the dust framework.", "url": "https://referencesource.org/ex-classification-system-crosswalk/dust-group-class-iii/", "verified_fields": ["basis", "north_american_designation"]} |
| {"basis": "Fibers and flyings", "category": "dust group", "derived_fields": ["category"], "id": "iiia-dust-group-class-iii", "iec_designation": "IIIA", "north_american_designation": "Class III", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "Gas / dust group | Typical Substances | IIC | Acetylene | Class I, Group A | Acetylene | IIB + H2 | Hydrogen | Class I, Group B | Hydrogen | IIB | Ethylene | Class I, Group C | Ethylene | IIA | Propane | Class I, Group D | Propane | IIIC | Conductive dust | Class II, Group E | Combustible metal dust | IIIB | Non-conductive dust | Class II, Group F | Combustible carbonaceous dust | Class II, Group G | Combustible dusts not in group E or F | IIIA | Combustible flyings | Class III |", "url": "https://referencesource.org/ex-classification-system-crosswalk/iiia-dust-group-class-iii/", "verified_fields": ["iec_designation", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class II", "id": "class-ii-us-protection-concept-dip", "iec_standard": "UL 1203", "north_american_designation": "(DIP)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(DIP) US Class II Division 1 UL 1203", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-ii-us-protection-concept-dip/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class II", "id": "class-ii-ca-protection-concept-dip-a21", "iec_standard": "CSA E61241-1-1", "north_american_designation": "(DIP) A21", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(DIP) A21 CA Class II Division 1 CSA E61241-1-1", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-ii-ca-protection-concept-dip-a21/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "derived_fields": ["category"], "division_or_zone": "Division 2", "id": "protection-concept-dip-a22", "iec_standard": "CSA E61241-1-1", "north_american_designation": "(DIP) A22", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(DIP) A22 Division 2 CSA E61241-1-1", "url": "https://referencesource.org/ex-classification-system-crosswalk/protection-concept-dip-a22/", "verified_fields": ["division_or_zone", "iec_standard", "north_american_designation"]} |
| {"basis": "Division 1 equipment generally satisfies Category 2", "category": "equipment category", "derived_fields": ["category"], "id": "category-2-equipment-category-division-1", "iec_designation": "Category 2", "north_american_designation": "Division 1", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Map existing equipment to ATEX categories (Division 1 equipment generally satisfies Category 2; Division 2 satisfies Category 3)", "url": "https://referencesource.org/ex-classification-system-crosswalk/category-2-equipment-category-division-1/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Hazard present during normal operation", "category": "area classification", "derived_fields": ["category"], "id": "zone-0-zone-1-area-classification-division-1", "iec_designation": "Zone 0 / Zone 1", "north_american_designation": "Division 1", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Division 1 | Hazard present during normal operation", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-0-zone-1-area-classification-division-1/", "verified_fields": ["basis", "north_american_designation"]} |
| {"category": "area classification", "derived_fields": ["category"], "id": "zone-0-zone-20-area-classification-division-1", "iec_designation": "Zone 0 / Zone 20", "north_american_designation": "Division 1", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Division 1 Zone 0 / Zone 20", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-0-zone-20-area-classification-division-1/", "verified_fields": ["iec_designation", "north_american_designation"]} |
| {"basis": "Explosive atmosphere likely during normal operation (10–1000 hrs/yr)", "category": "area classification", "derived_fields": ["category"], "id": "zone-1-zone-0-area-classification-division-1", "iec_designation": "Zone 1 (+ Zone 0)", "north_american_designation": "Division 1", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Division 1 | Zone 1 (+ Zone 0) | Explosive atmosphere likely during normal operation (10–1000 hrs/yr)", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-1-zone-0-area-classification-division-1/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"category": "area classification", "derived_fields": ["category"], "id": "zone-1-zone-21-area-classification-division-1", "iec_designation": "Zone 1 / Zone 21", "north_american_designation": "Division 1", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Division 1 Zone 1 / Zone 21", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-1-zone-21-area-classification-division-1/", "verified_fields": ["iec_designation", "north_american_designation"]} |
| {"basis": "Division 2 satisfies Category 3", "category": "equipment category", "derived_fields": ["category"], "id": "category-3-equipment-category-division-2", "iec_designation": "Category 3", "north_american_designation": "Division 2", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Map existing equipment to ATEX categories (Division 1 equipment generally satisfies Category 2; Division 2 satisfies Category 3)", "url": "https://referencesource.org/ex-classification-system-crosswalk/category-3-equipment-category-division-2/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Explosive atmosphere not likely; only abnormal conditions (<10 hrs/yr)", "category": "area classification", "derived_fields": ["category"], "disagreements": [{"field": "basis", "versions": [{"as_of": "2026-08-06", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Division 2 | Zone 2 | Explosive atmosphere not likely; only abnormal conditions (<10 hrs/yr)", "value": "Explosive atmosphere not likely; only abnormal conditions (<10 hrs/yr)"}, {"as_of": "2026-08-06", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Division 2 | Hazard present only under abnormal conditions", "value": "Hazard present only under abnormal conditions"}]}], "id": "zone-2-area-classification-division-2", "iec_designation": "Zone 2", "north_american_designation": "Division 2", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Division 2 | Zone 2 | Explosive atmosphere not likely; only abnormal conditions (<10 hrs/yr)", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-2-area-classification-division-2/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"category": "area classification", "derived_fields": ["category"], "id": "zone-2-zone-22-area-classification-division-2", "iec_designation": "Zone 2 / Zone 22", "north_american_designation": "Division 2", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Division 2 Zone 2 / Zone 22", "url": "https://referencesource.org/ex-classification-system-crosswalk/zone-2-zone-22-area-classification-division-2/", "verified_fields": ["iec_designation", "north_american_designation"]} |
| {"basis": "Prevent dust ingress and limit surface temperature", "category": "protection concept", "derived_fields": ["category"], "id": "ex-t-dust-protection-by-enclosure-protection-concept-dust-ignition-proof", "iec_designation": "Ex t (Dust protection by enclosure)", "iec_standard": "IEC 60079-31", "north_american_designation": "Dust-ignition-proof", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Dust-ignition-proof | Ex t (Dust protection by enclosure) | IEC 60079-31 | Prevent dust ingress and limit surface temperature", "url": "https://referencesource.org/ex-classification-system-crosswalk/ex-t-dust-protection-by-enclosure-protection-concept-dust-ignition-proof/", "verified_fields": ["basis", "iec_designation", "iec_standard", "north_american_designation"]} |
| {"basis": "Encapsulation", "category": "protection concept", "derived_fields": ["category"], "id": "ex-m-protection-concept-encapsulation", "iec_designation": "Ex m", "north_american_designation": "Encapsulation", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Ex m | Encapsulation", "url": "https://referencesource.org/ex-classification-system-crosswalk/ex-m-protection-concept-encapsulation/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 1 & 2", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex", "iec_standard": "CSA 60079-0", "north_american_designation": "Ex", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex CA Class I Division 1 & 2 CSA 60079-0", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Zone 20, 21, 22", "id": "us-protection-concept-ex", "iec_standard": "ISA 60079-0", "north_american_designation": "Ex", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex US Zone 20, 21, 22 ISA 60079-0", "url": "https://referencesource.org/ex-classification-system-crosswalk/us-protection-concept-ex/", "verified_fields": ["country", "division_or_zone", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-d", "iec_standard": "CSA 60079-1", "north_american_designation": "Ex d", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex d CA Class I Zone 1 CSA 60079-1", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-d/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-e", "iec_standard": "CSA E60079-7", "north_american_designation": "Ex e", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex e CA Class I Zone 1 CSA E60079-7", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-e/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 0", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-ia", "iec_standard": "CSA E60079-11", "north_american_designation": "EX ia", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "EX ia CA Class I Zone 0 CSA E60079-11", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-ia/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-ib", "iec_standard": "CSA E60079-11", "north_american_designation": "Ex ib", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex ib CA Class I Zone 1 CSA E60079-11", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-ib/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Encapsulated", "category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-m", "iec_standard": "CSA E60079-18", "north_american_designation": "Ex m", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Encapsulated Ex m CA Class I Zone 1 CSA E60079-18", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-m/", "verified_fields": ["basis", "country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 2", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-na", "iec_standard": "CSA E60079-15", "north_american_designation": "EX nA", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "EX nA CA Class I Zone 2 CSA E60079-15", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-na/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 2", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-nc", "iec_standard": "CSA E60079-15", "north_american_designation": "Ex nC", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex nC CA Class I Zone 2 CSA E60079-15", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-nc/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 2", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-nl", "iec_standard": "CSA E60079-15", "north_american_designation": "Ex nL", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex nL CA Class I Zone 2 CSA E60079-15", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-nl/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 2", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-nr", "iec_standard": "CSA E60079-15", "north_american_designation": "Ex nR", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex nR CA Class I Zone 2 CSA E60079-15", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-nr/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-o", "iec_standard": "CSA E60079-6", "north_american_designation": "EX o", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "EX o CA Class I Zone 1 CSA E60079-6", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-o/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-px", "iec_standard": "CSA E60079-2", "north_american_designation": "Ex px", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex px CA Class I Zone 1 CSA E60079-2", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-px/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-py", "iec_standard": "CSA E60079-2", "north_american_designation": "Ex py", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex py CA Class I Zone 1 CSA E60079-2", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-py/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 2", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-pz", "iec_standard": "CSA E60079-2", "north_american_designation": "Ex pz", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex pz CA Class I Zone 2 CSA E60079-2", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-pz/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Zone 1", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ex-q", "iec_standard": "CSA E60079-5", "north_american_designation": "Ex q", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Ex q CA Class I Zone 1 CSA E60079-5", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ex-q/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Contain the explosion inside the enclosure", "category": "protection concept", "derived_fields": ["category"], "id": "ex-d-flameproof-protection-concept-explosion-proof-xp", "iec_designation": "Ex d (Flameproof)", "iec_standard": "IEC 60079-1", "north_american_designation": "Explosion-proof (XP)", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Explosion-proof (XP) | Ex d (Flameproof) | IEC 60079-1 | Contain the explosion inside the enclosure", "url": "https://referencesource.org/ex-classification-system-crosswalk/ex-d-flameproof-protection-concept-explosion-proof-xp/", "verified_fields": ["basis", "iec_designation", "iec_standard", "north_american_designation"]} |
| {"basis": "Protection concept", "category": "system attribute", "derived_fields": ["category"], "id": "iec-aligned-types-ex-d-ex-i-ex-e-etc-system-attribute-explosion-proof-xp-intrinsically-safe-is", "iec_designation": "IEC-aligned types (Ex d, Ex i, Ex e, etc.)", "north_american_designation": "Explosion-proof (XP), intrinsically safe (IS)", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Protection concept | Explosion-proof (XP), intrinsically safe (IS) | IEC-aligned types (Ex d, Ex i, etc.) | IEC-aligned types (Ex d, Ex i, Ex e, etc.)", "url": "https://referencesource.org/ex-classification-system-crosswalk/iec-aligned-types-ex-d-ex-i-ex-e-etc-system-attribute-explosion-proof-xp-intrinsically-safe-is/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Flameproof enclosure", "category": "protection concept", "derived_fields": ["category"], "id": "ex-d-protection-concept-flameproof-enclosure", "iec_designation": "Ex d", "north_american_designation": "Flameproof enclosure", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Ex d | Flameproof enclosure", "url": "https://referencesource.org/ex-classification-system-crosswalk/ex-d-protection-concept-flameproof-enclosure/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "MESG <0.50 mm", "category": "gas group", "derived_fields": ["category"], "disagreements": [{"field": "basis", "versions": [{"as_of": "2026-08-06", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "A | IIC | Acetylene | <0.50 mm", "value": "MESG <0.50 mm"}, {"as_of": "2026-08-06", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "Acetylene | A | 305 | 581 | 6,000 PSI | IIC", "value": "Acetylene"}]}], "id": "iic-gas-group-group-a", "iec_designation": "IIC", "north_american_designation": "Group A", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "A | IIC | Acetylene | <0.50 mm", "url": "https://referencesource.org/ex-classification-system-crosswalk/iic-gas-group-group-a/", "verified_fields": ["iec_designation"]} |
| {"basis": "Hydrogen", "category": "gas group", "derived_fields": ["category"], "id": "iic-gas-group-group-b", "iec_designation": "IIC", "north_american_designation": "Group B", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "Hydrogen | B | 520 | 968 | 6,000 PSI | IIC", "url": "https://referencesource.org/ex-classification-system-crosswalk/iic-gas-group-group-b/", "verified_fields": ["basis", "iec_designation"]} |
| {"basis": "MESG <0.50 mm", "category": "gas group", "derived_fields": ["category"], "id": "iic-partially-iib-h-gas-group-group-b", "iec_designation": "IIC (partially IIB+H₂)", "north_american_designation": "Group B", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "B | IIC (partially IIB+H₂) | Hydrogen, butadiene | <0.50 mm", "url": "https://referencesource.org/ex-classification-system-crosswalk/iic-partially-iib-h-gas-group-group-b/", "verified_fields": ["iec_designation"]} |
| {"basis": "MESG 0.50–0.90 mm", "category": "gas group", "derived_fields": ["category"], "disagreements": [{"field": "basis", "versions": [{"as_of": "2026-08-06", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "C | IIB | Ethylene, ethyl ether | 0.50–0.90 mm", "value": "MESG 0.50–0.90 mm"}, {"as_of": "2026-08-06", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "Ethylene | C | 450 | 842 | 1,200 PSI | IIB", "value": "Ethylene"}]}], "id": "iib-gas-group-group-c", "iec_designation": "IIB", "north_american_designation": "Group C", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "C | IIB | Ethylene, ethyl ether | 0.50–0.90 mm", "url": "https://referencesource.org/ex-classification-system-crosswalk/iib-gas-group-group-c/", "verified_fields": ["iec_designation"]} |
| {"basis": "Methane (mining)", "category": "gas group", "derived_fields": ["category"], "id": "gas-group-group-d", "north_american_designation": "Group D", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Methane (mining) Group D", "url": "https://referencesource.org/ex-classification-system-crosswalk/gas-group-group-d/", "verified_fields": ["basis", "north_american_designation"]} |
| {"basis": "MESG >0.90 mm", "category": "gas group", "derived_fields": ["category"], "disagreements": [{"field": "basis", "versions": [{"as_of": "2026-08-06", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "D | IIA | Methane, propane, gasoline | >0.90 mm", "value": "MESG >0.90 mm"}, {"as_of": "2026-08-06", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "Gasoline | D | 280 | 536 | 600 PSI | IIA", "value": "Gasoline"}, {"as_of": "2026-08-06", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "D (Propane) | IIA", "value": "Propane"}]}], "id": "iia-gas-group-group-d", "iec_designation": "IIA", "north_american_designation": "Group D", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "D | IIA | Methane, propane, gasoline | >0.90 mm", "url": "https://referencesource.org/ex-classification-system-crosswalk/iia-gas-group-group-d/", "verified_fields": ["iec_designation"]} |
| {"basis": "Combustible Metal Dusts", "category": "dust group", "derived_fields": ["category"], "disagreements": [{"field": "basis", "versions": [{"as_of": "2026-10-06", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Combustible Metal Dusts Group E", "value": "Combustible Metal Dusts"}, {"as_of": "2026-10-06", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "E | Metal dust", "value": "Metal dust"}]}], "id": "dust-group-group-e", "north_american_designation": "Group E", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Combustible Metal Dusts Group E", "url": "https://referencesource.org/ex-classification-system-crosswalk/dust-group-group-e/", "verified_fields": ["basis", "north_american_designation"]} |
| {"basis": "Carbon dust", "category": "dust group", "derived_fields": ["category"], "disagreements": [], "id": "dust-group-group-f", "north_american_designation": "Group F", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "F | Carbon dust", "url": "https://referencesource.org/ex-classification-system-crosswalk/dust-group-group-f/", "verified_fields": ["basis"]} |
| {"basis": "Grain / flour dust", "category": "dust group", "derived_fields": ["category"], "id": "dust-group-group-g", "north_american_designation": "Group G", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "G | Grain / flour dust", "url": "https://referencesource.org/ex-classification-system-crosswalk/dust-group-group-g/", "verified_fields": ["basis"]} |
| {"basis": "Gas classification", "category": "system attribute", "derived_fields": ["category"], "id": "groups-iic-iib-iia-system-attribute-groups-a-b-c-d", "iec_designation": "Groups IIC, IIB, IIA", "north_american_designation": "Groups A, B, C, D", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Gas classification | Groups A, B, C, D | Groups IIC, IIB, IIA | Groups IIC, IIB, IIA", "url": "https://referencesource.org/ex-classification-system-crosswalk/groups-iic-iib-iia-system-attribute-groups-a-b-c-d/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Seal ignition source from atmosphere", "category": "protection concept", "derived_fields": ["category"], "id": "ex-nc-ex-m-protection-concept-hermetically-sealed", "iec_designation": "Ex nC / Ex m", "iec_standard": "IEC 60079-15 / -18", "north_american_designation": "Hermetically sealed", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Hermetically sealed | Ex nC / Ex m | IEC 60079-15 / -18 | Seal ignition source from atmosphere", "url": "https://referencesource.org/ex-classification-system-crosswalk/ex-nc-ex-m-protection-concept-hermetically-sealed/", "verified_fields": ["basis", "iec_designation", "iec_standard", "north_american_designation"]} |
| {"basis": "Increased safety", "category": "protection concept", "derived_fields": ["category"], "id": "ex-e-protection-concept-increased-safety", "iec_designation": "Ex e", "north_american_designation": "Increased safety", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Ex e | Increased safety", "url": "https://referencesource.org/ex-classification-system-crosswalk/ex-e-protection-concept-increased-safety/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Intrinsic safety", "category": "protection concept", "derived_fields": ["category"], "id": "ex-i-protection-concept-intrinsically-safe", "iec_designation": "Ex i", "north_american_designation": "Intrinsically Safe", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Ex i | Intrinsic safety", "url": "https://referencesource.org/ex-classification-system-crosswalk/ex-i-protection-concept-intrinsically-safe/", "verified_fields": ["basis", "iec_designation"]} |
| {"basis": "Limit energy below ignition threshold", "category": "protection concept", "derived_fields": ["category"], "id": "ex-i-ex-ia-ex-ib-protection-concept-intrinsically-safe-is", "iec_designation": "Ex i (Ex ia, Ex ib)", "iec_standard": "IEC 60079-11", "north_american_designation": "Intrinsically Safe (IS)", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Intrinsically Safe (IS) | Ex i (Ex ia, Ex ib) | IEC 60079-11 | Limit energy below ignition threshold", "url": "https://referencesource.org/ex-classification-system-crosswalk/ex-i-ex-ia-ex-ib-protection-concept-intrinsically-safe-is/", "verified_fields": ["basis", "iec_designation", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-is", "iec_standard": "C22.2 No. 157", "north_american_designation": "(IS)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(IS) CA Class I Division 1 C22.2 No. 157", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-is/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-is", "iec_standard": "UL 913 / FM 3610", "north_american_designation": "(IS)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(IS) US Class I Division 1 UL 913 / FM 3610", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-is/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class II", "id": "class-ii-ca-protection-concept-is", "iec_standard": "CSA C22.2 No. 157", "north_american_designation": "(IS)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(IS) CA Class II Division 1 CSA C22.2 No. 157", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-ii-ca-protection-concept-is/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class II", "id": "class-ii-us-protection-concept-is", "iec_standard": "UL 913 / FM 3610", "north_american_designation": "(IS)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(IS) US Class II Division 1 UL 913 / FM 3610", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-ii-us-protection-concept-is/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class III", "id": "class-iii-ca-protection-concept-is", "iec_standard": "CSA C22.2 No. 157", "north_american_designation": "(IS)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(IS) CA Class III Division 1 CSA C22.2 No. 157", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-iii-ca-protection-concept-is/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class III", "id": "class-iii-us-protection-concept-is", "iec_standard": "UL 913 / FM 3610", "north_american_designation": "(IS)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(IS) US Class III Division 1 UL 913 / FM 3610", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-iii-us-protection-concept-is/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Geographic use: USA, Canada vs EU, UK, most of the world", "category": "system attribute", "derived_fields": ["category"], "id": "atex-iecex-zone-system-attribute-nec-500-class-division", "iec_designation": "ATEX / IECEx (Zone)", "north_american_designation": "NEC 500 (Class/Division)", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Geographic use | USA, Canada | USA, Canada | EU, UK, most of the world", "url": "https://referencesource.org/ex-classification-system-crosswalk/atex-iecex-zone-system-attribute-nec-500-class-division/"} |
| {"basis": "Legal framework", "category": "system attribute", "derived_fields": ["category"], "id": "eu-directive-2014-34-eu-iecex-scheme-system-attribute-nfpa-70-adopted-by-ahjs", "iec_designation": "EU Directive 2014/34/EU / IECEx scheme", "north_american_designation": "NFPA 70 (adopted by AHJs)", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Legal framework | NFPA 70 (adopted by AHJs) | NFPA 70 (adopted by AHJs) | EU Directive 2014/34/EU / IECEx scheme", "url": "https://referencesource.org/ex-classification-system-crosswalk/eu-directive-2014-34-eu-iecex-scheme-system-attribute-nfpa-70-adopted-by-ahjs/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 2", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-ni", "iec_standard": "C22.2 No. 213", "north_american_designation": "(NI)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(NI) CA Class I Division 2 C22.2 No. 213", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-ni/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Non-Incendive", "category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 2", "hazard_class": "Class I", "id": "class-i-us-protection-concept-ni", "iec_standard": "ISA 12.12.01/FM 3611", "north_american_designation": "(NI)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Non-Incendive (NI) US Class I Division 2 ISA 12.12.01/FM 3611", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-ni/", "verified_fields": ["basis", "country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Dust Protected", "category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 2", "hazard_class": "Class II", "id": "class-ii-us-protection-concept-ni", "iec_standard": "ISA 12.12.01 / FM 3611", "north_american_designation": "(NI)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Dust Protected (NI) US Class II Division 2 ISA 12.12.01 / FM 3611", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-ii-us-protection-concept-ni/", "verified_fields": ["basis", "country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Normal operation cannot cause ignition", "category": "protection concept", "derived_fields": ["category"], "id": "ex-na-ex-ec-protection-concept-non-incendive", "iec_designation": "Ex nA / Ex ec", "iec_standard": "IEC 60079-15 / -7", "north_american_designation": "Non-incendive", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Non-incendive | Ex nA / Ex ec | IEC 60079-15 / -7 | Normal operation cannot cause ignition", "url": "https://referencesource.org/ex-classification-system-crosswalk/ex-na-ex-ec-protection-concept-non-incendive/", "verified_fields": ["basis", "iec_designation", "iec_standard", "north_american_designation"]} |
| {"basis": "Certification body", "category": "system attribute", "derived_fields": ["category"], "id": "notified-bodies-atex-excbs-iecex-system-attribute-nrtls-ul-fm-csa", "iec_designation": "Notified Bodies (ATEX) / ExCBs (IECEx)", "north_american_designation": "NRTLs (UL, FM, CSA)", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Certification body | NRTLs (UL, FM, CSA) | NRTLs | Notified Bodies (ATEX) / ExCBs (IECEx)", "url": "https://referencesource.org/ex-classification-system-crosswalk/notified-bodies-atex-excbs-iecex-system-attribute-nrtls-ul-fm-csa/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Pressurization", "category": "protection concept", "derived_fields": ["category"], "id": "ex-p-protection-concept-pressurization", "iec_designation": "Ex p", "north_american_designation": "Pressurization", "source": "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "source_quote": "Ex p | Pressurization", "url": "https://referencesource.org/ex-classification-system-crosswalk/ex-p-protection-concept-pressurization/", "verified_fields": ["basis", "iec_designation", "north_american_designation"]} |
| {"basis": "Maintain positive pressure with inert gas", "category": "protection concept", "derived_fields": ["category"], "id": "ex-p-ex-px-ex-py-ex-pz-protection-concept-purged-pressurized", "iec_designation": "Ex p (Ex px, Ex py, Ex pz)", "iec_standard": "IEC 60079-2", "north_american_designation": "Purged/Pressurized", "source": "https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "source_quote": "Purged/Pressurized | Ex p (Ex px, Ex py, Ex pz) | IEC 60079-2 | Maintain positive pressure with inert gas", "url": "https://referencesource.org/ex-classification-system-crosswalk/ex-p-ex-px-ex-py-ex-pz-protection-concept-purged-pressurized/", "verified_fields": ["basis", "iec_designation", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class II", "id": "class-ii-ca-protection-concept-px", "iec_standard": "NFPA 496", "north_american_designation": "(PX)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(PX) CA Class II Division 1 NFPA 496", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-ii-ca-protection-concept-px/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class II", "id": "class-ii-us-protection-concept-px", "iec_standard": "NFPA 496 (FM 3620)", "north_american_designation": "(PX)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(PX) US Class II Division 1 NFPA 496 (FM 3620)", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-ii-us-protection-concept-px/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class II", "id": "class-ii-ca-protection-concept-py", "iec_standard": "NFPA 496", "north_american_designation": "(PY)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(PY) CA Class II Division 1 NFPA 496", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-ii-ca-protection-concept-py/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "hazard_class": "Class II", "id": "class-ii-us-protection-concept-py", "north_american_designation": "(PY)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(PY) US Class II", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-ii-us-protection-concept-py/", "verified_fields": ["country", "hazard_class", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 2", "hazard_class": "Class II", "id": "class-ii-ca-protection-concept-pz", "iec_standard": "NFPA 496", "north_american_designation": "(PZ)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(PZ) CA Class II Division 2 NFPA 496", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-ii-ca-protection-concept-pz/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 2", "hazard_class": "Class II", "id": "class-ii-us-protection-concept-pz", "iec_standard": "NFPA 496 (FM 3620)", "north_american_designation": "(PZ)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(PZ) US Class II Division 2 NFPA 496 (FM 3620)", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-ii-us-protection-concept-pz/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T1 | T1 | 450 | 842", "value": "842"}], "basis": "Ignition temperature of gas / dust >450", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "t1-temperature-code-t1", "iec_designation": "T1", "max_surface_temperature_c": "450", "north_american_designation": "T1", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "450 | T1 | >450", "url": "https://referencesource.org/ex-classification-system-crosswalk/t1-temperature-code-t1/", "verified_fields": ["iec_designation", "max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T2 | T2 | 300 | 572", "value": "572"}], "basis": "Ignition temperature of gas / dust >300-450", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "t2-temperature-code-t2", "iec_designation": "T2", "max_surface_temperature_c": "300", "north_american_designation": "T2", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "300 | T2 | >300-450", "url": "https://referencesource.org/ex-classification-system-crosswalk/t2-temperature-code-t2/", "verified_fields": ["iec_designation", "max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T2A | | 280 | 536", "value": "536"}], "basis": "Ignition temperature of gas / dust >280-300", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "temperature-code-t2a", "max_surface_temperature_c": "280", "north_american_designation": "T2A", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "280 | T2A | >280-300", "url": "https://referencesource.org/ex-classification-system-crosswalk/temperature-code-t2a/", "verified_fields": ["max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T2B | | 260 | 500", "value": "500"}], "basis": "Ignition temperature of gas / dust >260-280", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "temperature-code-t2b", "max_surface_temperature_c": "260", "north_american_designation": "T2B", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "260 | T2B | >260-280", "url": "https://referencesource.org/ex-classification-system-crosswalk/temperature-code-t2b/", "verified_fields": ["max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T2C | | 230 | 446", "value": "446"}], "basis": "Ignition temperature of gas / dust >230-260", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "temperature-code-t2c", "max_surface_temperature_c": "230", "north_american_designation": "T2C", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "230 | T2C | >230-260", "url": "https://referencesource.org/ex-classification-system-crosswalk/temperature-code-t2c/", "verified_fields": ["max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T2D | | 215 | 419", "value": "419"}], "basis": "Ignition temperature of gas / dust >215-230", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "temperature-code-t2d", "max_surface_temperature_c": "215", "north_american_designation": "T2D", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "215 | T2D | >215-230", "url": "https://referencesource.org/ex-classification-system-crosswalk/temperature-code-t2d/", "verified_fields": ["max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T3 | T3 | 200 | 392", "value": "392"}], "basis": "Ignition temperature of gas / dust >200-300", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "t3-temperature-code-t3", "iec_designation": "T3", "max_surface_temperature_c": "200", "north_american_designation": "T3", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "200 | T3 | >200-300", "url": "https://referencesource.org/ex-classification-system-crosswalk/t3-temperature-code-t3/", "verified_fields": ["iec_designation", "max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T3A | | 180 | 356", "value": "356"}], "basis": "Ignition temperature of gas / dust >180-200", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "temperature-code-t3a", "max_surface_temperature_c": "180", "north_american_designation": "T3A", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "180 | T3A | >180-200", "url": "https://referencesource.org/ex-classification-system-crosswalk/temperature-code-t3a/", "verified_fields": ["max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T3B | | 165 | 329", "value": "329"}], "basis": "Ignition temperature of gas / dust >165-180", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "temperature-code-t3b", "max_surface_temperature_c": "165", "north_american_designation": "T3B", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "165 | T3B | >165-180", "url": "https://referencesource.org/ex-classification-system-crosswalk/temperature-code-t3b/", "verified_fields": ["max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T3C | | 160 | 320", "value": "320"}], "basis": "Ignition temperature of gas / dust >160-165", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "temperature-code-t3c", "max_surface_temperature_c": "160", "north_american_designation": "T3C", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "160 | T3C | >160-165", "url": "https://referencesource.org/ex-classification-system-crosswalk/temperature-code-t3c/", "verified_fields": ["max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T4 | T4 | 135 | 275", "value": "275"}], "basis": "Ignition temperature of gas / dust >135-200", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "t4-temperature-code-t4", "iec_designation": "T4", "max_surface_temperature_c": "135", "north_american_designation": "T4", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "135 | T4 | >135-200", "url": "https://referencesource.org/ex-classification-system-crosswalk/t4-temperature-code-t4/", "verified_fields": ["iec_designation", "max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T4A | | 120 | 248", "value": "248"}], "basis": "Ignition temperature of gas / dust >120-135", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "temperature-code-t4a", "max_surface_temperature_c": "120", "north_american_designation": "T4A", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "120 | T4A | >120-135", "url": "https://referencesource.org/ex-classification-system-crosswalk/temperature-code-t4a/", "verified_fields": ["max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T5 | T5 | 100 | 212", "value": "212"}], "basis": "Ignition temperature of gas / dust >100-135", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "t5-temperature-code-t5", "iec_designation": "T5", "max_surface_temperature_c": "100", "north_american_designation": "T5", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "100 | T5 | >100-135", "url": "https://referencesource.org/ex-classification-system-crosswalk/t5-temperature-code-t5/", "verified_fields": ["iec_designation", "max_surface_temperature_c", "north_american_designation"]} |
| {"also_reported": [{"as_of": "2026-08-06", "field": "max_surface_temperature_f", "source": "https://ldpi-inc.com/resources/classification-codes/class-1-locations/", "source_quote": "T6 | T6 | 85 | 185", "value": "185"}], "basis": "Ignition temperature of gas / dust >85-100", "category": "temperature code", "derived_fields": ["category"], "disagreements": [], "id": "t6-temperature-code-t6", "iec_designation": "T6", "max_surface_temperature_c": "85", "north_american_designation": "T6", "source": "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "source_quote": "85 | T6 | >85-100", "url": "https://referencesource.org/ex-classification-system-crosswalk/t6-temperature-code-t6/", "verified_fields": ["iec_designation", "max_surface_temperature_c", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "hazard_class": "Class I", "id": "class-i-ca-protection-concept-type-x", "north_american_designation": "Type X", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Type X CA Class I", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-type-x/", "verified_fields": ["country", "hazard_class", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-type-x", "iec_standard": "NFPA 496 (FM 3620)", "north_american_designation": "Type X", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Type X US Class I Division 1 NFPA 496 (FM 3620)", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-type-x/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-type-y", "iec_standard": "NFPA 496", "north_american_designation": "Type Y", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Type Y CA Class I Division 1 NFPA 496", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-type-y/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-type-y", "iec_standard": "NFPA 496 (FM 3620)", "north_american_designation": "Type Y", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Type Y US Class I Division 1 NFPA 496 (FM 3620)", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-type-y/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Pressurized", "category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 2", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-type-z", "iec_standard": "NFPA 496", "north_american_designation": "Type Z", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Pressurized Type Z CA Class I Division 2 NFPA 496", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-type-z/", "verified_fields": ["basis", "country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 2", "hazard_class": "Class I", "id": "class-i-us-protection-concept-type-z", "iec_standard": "NFPA 496 (FM 3620)", "north_american_designation": "Type Z", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Type Z US Class I Division 2 NFPA 496 (FM 3620)", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-type-z/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"category": "protection concept", "country": "CA", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class I", "id": "class-i-ca-protection-concept-xp", "iec_standard": "C22.2 No. 30", "north_american_designation": "(XP)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "(XP) CA Class I Division 1 C22.2 No. 30", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-ca-protection-concept-xp/", "verified_fields": ["country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
| {"basis": "Explosion Proof", "category": "protection concept", "country": "US", "derived_fields": ["category"], "division_or_zone": "Division 1", "hazard_class": "Class I", "id": "class-i-us-protection-concept-xp", "iec_standard": "UL 1203", "north_american_designation": "(XP)", "source": "https://www.euroswitch.com/wp-content/uploads/euroswitch-hazardous-area-guide_V6.pdf", "source_quote": "Explosion Proof (XP) US Class I Division 1 UL 1203", "url": "https://referencesource.org/ex-classification-system-crosswalk/class-i-us-protection-concept-xp/", "verified_fields": ["basis", "country", "division_or_zone", "hazard_class", "iec_standard", "north_american_designation"]} |
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