{"asset": "ex-classification-system-crosswalk", "asset_type": "equivalence", "body": "Crosswalk between the two concurrent hazardous-area classification systems: the North American Class / Division system of NEC Articles 500 and 505 (NFPA 70) and the CSA code, against the Zone system of IEC 60079, ATEX and IECEx. Each record is one designation in one system with its stated counterpart in the other, covering area classification (Division 1 and 2 against Zone 0, 1, 2, 20, 21, 22), gas groups (A, B, C, D against IIA, IIB, IIC, IIB+H2), dust groups (E, F, G against IIIA, IIIB, IIIC), protection concepts (explosion-proof against Ex d, intrinsically safe against Ex i, purged/pressurized against Ex p, dust-ignition-proof against Ex t, non-incendive against Ex nA/Ex ec) with the IEC standard number for each, and temperature codes T1 to T6 with their maximum surface temperatures. Answers 'is ATEX Ex d IIB T4 the same as Class I Div 1 Group C', 'what does T2D mean and is there an IEC equivalent', 'Division 1 or Zone 1 which is stricter', 'NEC Group B IEC equivalent', and 'can I install Zone 1 equipment in a Division 1 area'. Three things the mapping gets wrong when stated as a simple table: NEC 500 has no Zone 0 equivalent so Division 1 spans Zone 0 and Zone 1 and is under-specified for Zone 0; the North American temperature codes T2A, T2B, T2C, T2D, T3A, T3B, T3C and T4A have no IEC counterpart at all; and publishers disagree on NEC Group B, giving it as IIC or as IIB+H2, which changes the required flameproof gap. Every counterpart is quoted from the page that stated it and attributed, so the disagreement is visible.\n", "description": "Crosswalk between the two concurrent hazardous-area classification systems: the North American Class / Division system of NEC Articles 500 and 505 (NFPA 70) and the CSA code, against the Zone system of IEC 60079, ATEX and IECEx. Each record is one designation in one system with its stated counterpart in the other, covering area classification (Division 1 and 2 against Zone 0, 1, 2, 20, 21, 22), gas groups (A, B, C, D against IIA, IIB, IIC, IIB+H2), dust groups (E, F, G against IIIA, IIIB, IIIC), protection concepts (explosion-proof against Ex d, intrinsically safe against Ex i, purged/pressurized against Ex p, dust-ignition-proof against Ex t, non-incendive against Ex nA/Ex ec) with the IEC standard number for each, and temperature codes T1 to T6 with their maximum surface temperatures. Answers 'is ATEX Ex d IIB T4 the same as Class I Div 1 Group C', 'what does T2D mean and is there an IEC equivalent', 'Division 1 or Zone 1 which is stricter', 'NEC Group B IEC equivalent', and 'can I install Zone 1 equipment in a Division 1 area'. Three things the mapping gets wrong when stated as a simple table: NEC 500 has no Zone 0 equivalent so Division 1 spans Zone 0 and Zone 1 and is under-specified for Zone 0; the North American temperature codes T2A, T2B, T2C, T2D, T3A, T3B, T3C and T4A have no IEC counterpart at all; and publishers disagree on NEC Group B, giving it as IIC or as IIB+H2, which changes the required flameproof gap. Every counterpart is quoted from the page that stated it and attributed, so the disagreement is visible.", "file": "index.md", "generated": true, "harvested": "2026-08-06", "key_field": "north_american_designation", "licence": "Facts extracted from freely published manufacturer and industry reference pages. Designation crosswalks are safety facts, not copyrightable expression. NFPA 70 and the IEC 60079 series are not reproduced and were not opened -- the fact is taken, never the document. Four separate publishers, no bulk take from any one.", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html", "https://www.inframena.com/hazardous-area-classification-equivalency-guide/", "https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups", "https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "North American vs IEC/ATEX explosion protection designations", "type": "dataset", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Risk gradation", "body": "**Category:** system attribute\n\n**North American designation:** 2 levels (Div 1, Div 2)\n\n**IEC / ATEX designation:** 3 levels (Zone 0, 1, 2)\n\n**Basis or note:** Risk gradation\n\n> Risk gradation | 2 levels (Div 1, Div 2) | 3 levels (Zone 0, 1, 2) | 3 levels (Zone 0, 1, 2)\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "system attribute", "file": "3-levels-zone-0-1-2-system-attribute-2-levels-div-1-div-2.md", "generated": true, "harvested": "2026-08-06", "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_quote": "Risk gradation | 2 levels (Div 1, Div 2) | 3 levels (Zone 0, 1, 2) | 3 levels (Zone 0, 1, 2)", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "2 levels (Div 1, Div 2) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignitable fibers", "body": "**Category:** area classification\n\n**North American designation:** Class III\n\n**Basis or note:** Ignitable fibers\n\n> Class III | Ignitable fibers\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "area-classification-class-iii.md", "generated": true, "harvested": "2026-08-06", "id": "area-classification-class-iii", "north_american_designation": "Class III", "source_quote": "Class III | Ignitable fibers", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Class III \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Geographic use: USA, Canada vs EU, UK, most of the world", "body": "**Category:** system attribute\n\n**North American designation:** NEC 500 (Class/Division)\n\n**IEC / ATEX designation:** ATEX / IECEx (Zone)\n\n**Basis or note:** Geographic use: USA, Canada vs EU, UK, most of the world\n\n> Geographic use | USA, Canada | USA, Canada | EU, UK, most of the world\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "system attribute", "file": "atex-iecex-zone-system-attribute-nec-500-class-division.md", "generated": true, "harvested": "2026-08-06", "id": "atex-iecex-zone-system-attribute-nec-500-class-division", "iec_designation": "ATEX / IECEx (Zone)", "north_american_designation": "NEC 500 (Class/Division)", "source_quote": "Geographic use | USA, Canada | USA, Canada | EU, UK, most of the world", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "NEC 500 (Class/Division) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, iec_designation, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Grain, flour, plastic dusts", "body": "**Category:** dust group\n\n**North American designation:** Class II, Group G\n\n**Basis or note:** Grain, flour, plastic dusts\n\n> Class II, Group G\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "dust group", "file": "dust-group-class-ii-group-g.md", "generated": true, "harvested": "2026-08-06", "id": "dust-group-class-ii-group-g", "north_american_designation": "Class II, Group G", "source_quote": "Class II, Group G", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "Class II, Group G \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Legal framework", "body": "**Category:** system attribute\n\n**North American designation:** NFPA 70 (adopted by AHJs)\n\n**IEC / ATEX designation:** EU Directive 2014/34/EU / IECEx scheme\n\n**Basis or note:** Legal framework\n\n> Legal framework | NFPA 70 (adopted by AHJs) | NFPA 70 (adopted by AHJs) | EU Directive 2014/34/EU / IECEx scheme\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "system attribute", "file": "eu-directive-2014-34-eu-iecex-scheme-system-attribute-nfpa-70-adopted-by-ahjs.md", "generated": true, "harvested": "2026-08-06", "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_quote": "Legal framework | NFPA 70 (adopted by AHJs) | NFPA 70 (adopted by AHJs) | EU Directive 2014/34/EU / IECEx scheme", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "NFPA 70 (adopted by AHJs) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Contain the explosion inside the enclosure", "body": "**Category:** protection concept\n\n**North American designation:** Explosion-proof (XP)\n\n**IEC / ATEX designation:** Ex d (Flameproof)\n\n**IEC standard:** IEC 60079-1\n\n**Basis or note:** Contain the explosion inside the enclosure\n\n> Explosion-proof (XP) | Ex d (Flameproof) | IEC 60079-1 | Contain the explosion inside the enclosure\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "protection concept", "file": "ex-d-flameproof-protection-concept-explosion-proof-xp.md", "generated": true, "harvested": "2026-08-06", "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_quote": "Explosion-proof (XP) | Ex d (Flameproof) | IEC 60079-1 | Contain the explosion inside the enclosure", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Explosion-proof (XP) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Flameproof enclosure", "body": "**Category:** protection concept\n\n**North American designation:** Flameproof enclosure\n\n**IEC / ATEX designation:** Ex d\n\n**Basis or note:** Flameproof enclosure\n\n> Ex d | Flameproof enclosure\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "protection concept", "file": "ex-d-protection-concept-flameproof-enclosure.md", "generated": true, "harvested": "2026-08-06", "id": "ex-d-protection-concept-flameproof-enclosure", "iec_designation": "Ex d", "north_american_designation": "Flameproof enclosure", "source_quote": "Ex d | Flameproof enclosure", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Flameproof enclosure \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Increased safety", "body": "**Category:** protection concept\n\n**North American designation:** Increased safety\n\n**IEC / ATEX designation:** Ex e\n\n**Basis or note:** Increased safety\n\n> Ex e | Increased safety\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "protection concept", "file": "ex-e-protection-concept-increased-safety.md", "generated": true, "harvested": "2026-08-06", "id": "ex-e-protection-concept-increased-safety", "iec_designation": "Ex e", "north_american_designation": "Increased safety", "source_quote": "Ex e | Increased safety", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Increased safety \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Limit energy below ignition threshold", "body": "**Category:** protection concept\n\n**North American designation:** Intrinsically Safe (IS)\n\n**IEC / ATEX designation:** Ex i (Ex ia, Ex ib)\n\n**IEC standard:** IEC 60079-11\n\n**Basis or note:** Limit energy below ignition threshold\n\n> Intrinsically Safe (IS) | Ex i (Ex ia, Ex ib) | IEC 60079-11 | Limit energy below ignition threshold\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "protection concept", "file": "ex-i-ex-ia-ex-ib-protection-concept-intrinsically-safe-is.md", "generated": true, "harvested": "2026-08-06", "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_quote": "Intrinsically Safe (IS) | Ex i (Ex ia, Ex ib) | IEC 60079-11 | Limit energy below ignition threshold", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Intrinsically Safe (IS) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Intrinsic safety", "body": "**Category:** protection concept\n\n**North American designation:** Intrinsically Safe\n\n**IEC / ATEX designation:** Ex i\n\n**Basis or note:** Intrinsic safety\n\n> Ex i | Intrinsic safety\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "protection concept", "file": "ex-i-protection-concept-intrinsically-safe.md", "generated": true, "harvested": "2026-08-06", "id": "ex-i-protection-concept-intrinsically-safe", "iec_designation": "Ex i", "north_american_designation": "Intrinsically Safe", "source_quote": "Ex i | Intrinsic safety", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Intrinsically Safe \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Encapsulation", "body": "**Category:** protection concept\n\n**North American designation:** Encapsulation\n\n**IEC / ATEX designation:** Ex m\n\n**Basis or note:** Encapsulation\n\n> Ex m | Encapsulation\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "protection concept", "file": "ex-m-protection-concept-encapsulation.md", "generated": true, "harvested": "2026-08-06", "id": "ex-m-protection-concept-encapsulation", "iec_designation": "Ex m", "north_american_designation": "Encapsulation", "source_quote": "Ex m | Encapsulation", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Encapsulation \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Normal operation cannot cause ignition", "body": "**Category:** protection concept\n\n**North American designation:** Non-incendive\n\n**IEC / ATEX designation:** Ex nA / Ex ec\n\n**IEC standard:** IEC 60079-15 / -7\n\n**Basis or note:** Normal operation cannot cause ignition\n\n> Non-incendive | Ex nA / Ex ec | IEC 60079-15 / -7 | Normal operation cannot cause ignition\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "protection concept", "file": "ex-na-ex-ec-protection-concept-non-incendive.md", "generated": true, "harvested": "2026-08-06", "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_quote": "Non-incendive | Ex nA / Ex ec | IEC 60079-15 / -7 | Normal operation cannot cause ignition", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Non-incendive \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Seal ignition source from atmosphere", "body": "**Category:** protection concept\n\n**North American designation:** Hermetically sealed\n\n**IEC / ATEX designation:** Ex nC / Ex m\n\n**IEC standard:** IEC 60079-15 / -18\n\n**Basis or note:** Seal ignition source from atmosphere\n\n> Hermetically sealed | Ex nC / Ex m | IEC 60079-15 / -18 | Seal ignition source from atmosphere\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "protection concept", "file": "ex-nc-ex-m-protection-concept-hermetically-sealed.md", "generated": true, "harvested": "2026-08-06", "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_quote": "Hermetically sealed | Ex nC / Ex m | IEC 60079-15 / -18 | Seal ignition source from atmosphere", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Hermetically sealed \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Maintain positive pressure with inert gas", "body": "**Category:** protection concept\n\n**North American designation:** Purged/Pressurized\n\n**IEC / ATEX designation:** Ex p (Ex px, Ex py, Ex pz)\n\n**IEC standard:** IEC 60079-2\n\n**Basis or note:** Maintain positive pressure with inert gas\n\n> Purged/Pressurized | Ex p (Ex px, Ex py, Ex pz) | IEC 60079-2 | Maintain positive pressure with inert gas\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "protection concept", "file": "ex-p-ex-px-ex-py-ex-pz-protection-concept-purged-pressurized.md", "generated": true, "harvested": "2026-08-06", "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_quote": "Purged/Pressurized | Ex p (Ex px, Ex py, Ex pz) | IEC 60079-2 | Maintain positive pressure with inert gas", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Purged/Pressurized \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Pressurization", "body": "**Category:** protection concept\n\n**North American designation:** Pressurization\n\n**IEC / ATEX designation:** Ex p\n\n**Basis or note:** Pressurization\n\n> Ex p | Pressurization\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "protection concept", "file": "ex-p-protection-concept-pressurization.md", "generated": true, "harvested": "2026-08-06", "id": "ex-p-protection-concept-pressurization", "iec_designation": "Ex p", "north_american_designation": "Pressurization", "source_quote": "Ex p | Pressurization", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Pressurization \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Prevent dust ingress and limit surface temperature", "body": "**Category:** protection concept\n\n**North American designation:** Dust-ignition-proof\n\n**IEC / ATEX designation:** Ex t (Dust protection by enclosure)\n\n**IEC standard:** IEC 60079-31\n\n**Basis or note:** Prevent dust ingress and limit surface temperature\n\n> Dust-ignition-proof | Ex t (Dust protection by enclosure) | IEC 60079-31 | Prevent dust ingress and limit surface temperature\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "protection concept", "file": "ex-t-dust-protection-by-enclosure-protection-concept-dust-ignition-proof.md", "generated": true, "harvested": "2026-08-06", "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_quote": "Dust-ignition-proof | Ex t (Dust protection by enclosure) | IEC 60079-31 | Prevent dust ingress and limit surface temperature", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Dust-ignition-proof \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Metal dust", "body": "**Category:** gas group\n\n**North American designation:** Group E\n\n**Basis or note:** Metal dust\n\n> E | Metal dust\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "gas group", "file": "gas-group-group-e.md", "generated": true, "harvested": "2026-08-06", "id": "gas-group-group-e", "north_american_designation": "Group E", "source_quote": "E | Metal dust", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Group E \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Carbon dust", "body": "**Category:** gas group\n\n**North American designation:** Group F\n\n**Basis or note:** Carbon dust\n\n> F | Carbon dust\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "gas group", "file": "gas-group-group-f.md", "generated": true, "harvested": "2026-08-06", "id": "gas-group-group-f", "north_american_designation": "Group F", "source_quote": "F | Carbon dust", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Group F \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Grain / flour dust", "body": "**Category:** gas group\n\n**North American designation:** Group G\n\n**Basis or note:** Grain / flour dust\n\n> G | Grain / flour dust\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "gas group", "file": "gas-group-group-g.md", "generated": true, "harvested": "2026-08-06", "id": "gas-group-group-g", "north_american_designation": "Group G", "source_quote": "G | Grain / flour dust", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Group G \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Gas classification", "body": "**Category:** system attribute\n\n**North American designation:** Groups A, B, C, D\n\n**IEC / ATEX designation:** Groups IIC, IIB, IIA\n\n**Basis or note:** Gas classification\n\n> Gas classification | Groups A, B, C, D | Groups IIC, IIB, IIA | Groups IIC, IIB, IIA\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "system attribute", "file": "groups-iic-iib-iia-system-attribute-groups-a-b-c-d.md", "generated": true, "harvested": "2026-08-06", "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_quote": "Gas classification | Groups A, B, C, D | Groups IIC, IIB, IIA | Groups IIC, IIB, IIA", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Groups A, B, C, D \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Protection concept", "body": "**Category:** system attribute\n\n**North American designation:** Explosion-proof (XP), intrinsically safe (IS)\n\n**IEC / ATEX designation:** IEC-aligned types (Ex d, Ex i, Ex e, etc.)\n\n**Basis or note:** Protection concept\n\n> 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.)\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "system attribute", "file": "iec-aligned-types-ex-d-ex-i-ex-e-etc-system-attribute-explosion-proof-xp-intrinsically-safe-is.md", "generated": true, "harvested": "2026-08-06", "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_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.)", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Explosion-proof (XP), intrinsically safe (IS) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Propane", "body": "**Category:** gas group\n\n**North American designation:** Class I, Group D\n\n**IEC / ATEX designation:** IIA\n\n**Basis or note:** Propane\n\n> IIA | Propane | Class I, Group D |\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "gas group", "file": "iia-gas-group-class-i-group-d.md", "generated": true, "harvested": "2026-08-06", "id": "iia-gas-group-class-i-group-d", "iec_designation": "IIA", "north_american_designation": "Class I, Group D", "source_quote": "IIA | Propane | Class I, Group D |", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "Class I, Group D \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Gasoline", "body": "**Category:** gas group\n\n**North American designation:** Group D\n\n**IEC / ATEX designation:** IIA\n\n**Basis or note:** Gasoline\n\n> Gasoline | D | 280 | 536 | 600 PSI | IIA\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "gas group", "file": "iia-gas-group-group-d-2.md", "generated": true, "harvested": "2026-08-06", "id": "iia-gas-group-group-d-2", "iec_designation": "IIA", "north_american_designation": "Group D", "source_quote": "Gasoline | D | 280 | 536 | 600 PSI | IIA", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "Group D \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Propane", "body": "**Category:** gas group\n\n**North American designation:** Group D\n\n**IEC / ATEX designation:** IIA\n\n**Basis or note:** Propane\n\n> D (Propane) | IIA\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "gas group", "file": "iia-gas-group-group-d-3.md", "generated": true, "harvested": "2026-08-06", "id": "iia-gas-group-group-d-3", "iec_designation": "IIA", "north_american_designation": "Group D", "source_quote": "D (Propane) | IIA", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Group D \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "MESG >0.90 mm", "body": "**Category:** gas group\n\n**North American designation:** Group D\n\n**IEC / ATEX designation:** IIA\n\n**Basis or note:** MESG >0.90 mm\n\n> D | IIA | Methane, propane, gasoline | >0.90 mm\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "gas group", "file": "iia-gas-group-group-d.md", "generated": true, "harvested": "2026-08-06", "id": "iia-gas-group-group-d", "iec_designation": "IIA", "north_american_designation": "Group D", "source_quote": "D | IIA | Methane, propane, gasoline | >0.90 mm", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Group D \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Ethylene", "body": "**Category:** gas group\n\n**North American designation:** Class I, Group C\n\n**IEC / ATEX designation:** IIB\n\n**Basis or note:** Ethylene\n\n> IIB | Ethylene | Class I, Group C | Ethylene\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "gas group", "file": "iib-gas-group-class-i-group-c.md", "generated": true, "harvested": "2026-08-06", "id": "iib-gas-group-class-i-group-c", "iec_designation": "IIB", "north_american_designation": "Class I, Group C", "source_quote": "IIB | Ethylene | Class I, Group C | Ethylene", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "Class I, Group C \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ethylene", "body": "**Category:** gas group\n\n**North American designation:** Group C\n\n**IEC / ATEX designation:** IIB\n\n**Basis or note:** Ethylene\n\n> Ethylene | C | 450 | 842 | 1,200 PSI | IIB\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "gas group", "file": "iib-gas-group-group-c-2.md", "generated": true, "harvested": "2026-08-06", "id": "iib-gas-group-group-c-2", "iec_designation": "IIB", "north_american_designation": "Group C", "source_quote": "Ethylene | C | 450 | 842 | 1,200 PSI | IIB", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "Group C \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "MESG 0.50\u20130.90 mm", "body": "**Category:** gas group\n\n**North American designation:** Group C\n\n**IEC / ATEX designation:** IIB\n\n**Basis or note:** MESG 0.50\u20130.90 mm\n\n> C | IIB | Ethylene, ethyl ether | 0.50\u20130.90 mm\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "gas group", "file": "iib-gas-group-group-c.md", "generated": true, "harvested": "2026-08-06", "id": "iib-gas-group-group-c", "iec_designation": "IIB", "north_american_designation": "Group C", "source_quote": "C | IIB | Ethylene, ethyl ether | 0.50\u20130.90 mm", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Group C \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Hydrogen", "body": "**Category:** gas group\n\n**North American designation:** Class I, Group B\n\n**IEC / ATEX designation:** IIB + H2\n\n**Basis or note:** Hydrogen\n\n> IIB + H 2 | Hydrogen | Class I, Group B | Hydrogen\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "gas group", "file": "iib-h2-gas-group-class-i-group-b.md", "generated": true, "harvested": "2026-08-06", "id": "iib-h2-gas-group-class-i-group-b", "iec_designation": "IIB + H2", "north_american_designation": "Class I, Group B", "source_quote": "IIB + H 2 | Hydrogen | Class I, Group B | Hydrogen", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "Class I, Group B \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Acetylene", "body": "**Category:** gas group\n\n**North American designation:** Class I, Group A\n\n**IEC / ATEX designation:** IIC\n\n**Basis or note:** Acetylene\n\n> IIC | Acetylene | Class I, Group A | Acetylene\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "gas group", "file": "iic-gas-group-class-i-group-a.md", "generated": true, "harvested": "2026-08-06", "id": "iic-gas-group-class-i-group-a", "iec_designation": "IIC", "north_american_designation": "Class I, Group A", "source_quote": "IIC | Acetylene | Class I, Group A | Acetylene", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "Class I, Group A \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Acetylene", "body": "**Category:** gas group\n\n**North American designation:** Group A\n\n**IEC / ATEX designation:** IIC\n\n**Basis or note:** Acetylene\n\n> Acetylene | A | 305 | 581 | 6,000 PSI | IIC\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "gas group", "file": "iic-gas-group-group-a-2.md", "generated": true, "harvested": "2026-08-06", "id": "iic-gas-group-group-a-2", "iec_designation": "IIC", "north_american_designation": "Group A", "source_quote": "Acetylene | A | 305 | 581 | 6,000 PSI | IIC", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "Group A \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "MESG <0.50 mm", "body": "**Category:** gas group\n\n**North American designation:** Group A\n\n**IEC / ATEX designation:** IIC\n\n**Basis or note:** MESG <0.50 mm\n\n> A | IIC | Acetylene | <0.50 mm\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "gas group", "file": "iic-gas-group-group-a.md", "generated": true, "harvested": "2026-08-06", "id": "iic-gas-group-group-a", "iec_designation": "IIC", "north_american_designation": "Group A", "source_quote": "A | IIC | Acetylene | <0.50 mm", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Group A \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Hydrogen", "body": "**Category:** gas group\n\n**North American designation:** Group B\n\n**IEC / ATEX designation:** IIC\n\n**Basis or note:** Hydrogen\n\n> Hydrogen | B | 520 | 968 | 6,000 PSI | IIC\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "gas group", "file": "iic-gas-group-group-b.md", "generated": true, "harvested": "2026-08-06", "id": "iic-gas-group-group-b", "iec_designation": "IIC", "north_american_designation": "Group B", "source_quote": "Hydrogen | B | 520 | 968 | 6,000 PSI | IIC", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "Group B \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "MESG <0.50 mm", "body": "**Category:** gas group\n\n**North American designation:** Group B\n\n**IEC / ATEX designation:** IIC (partially IIB+H\u2082)\n\n**Basis or note:** MESG <0.50 mm\n\n> B | IIC (partially IIB+H\u2082) | Hydrogen, butadiene | <0.50 mm\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "gas group", "file": "iic-partially-iib-h-gas-group-group-b.md", "generated": true, "harvested": "2026-08-06", "id": "iic-partially-iib-h-gas-group-group-b", "iec_designation": "IIC (partially IIB+H\u2082)", "north_american_designation": "Group B", "source_quote": "B | IIC (partially IIB+H\u2082) | Hydrogen, butadiene | <0.50 mm", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Group B \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Fibers and flyings", "body": "**Category:** dust group\n\n**North American designation:** Class III\n\n**IEC / ATEX designation:** IIIA\n\n**Basis or note:** Fibers and flyings\n\n> Gas / dust group | Typical Substances | IIC | Acetylene | Class I, Group A | Acetylene | IIB + H 2 | 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 |\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "dust group", "file": "iiia-dust-group-class-iii.md", "generated": true, "harvested": "2026-08-06", "id": "iiia-dust-group-class-iii", "iec_designation": "IIIA", "north_american_designation": "Class III", "source_quote": "Gas / dust group | Typical Substances | IIC | Acetylene | Class I, Group A | Acetylene | IIB + H 2 | 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 |", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "Class III \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Carbon dusts", "body": "**Category:** dust group\n\n**North American designation:** Class II, Group F\n\n**IEC / ATEX designation:** IIIB\n\n**Basis or note:** Carbon dusts\n\n> Gas / dust group | Typical Substances | IIC | Acetylene | Class I, Group A | Acetylene | IIB + H 2 | 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 |\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "dust group", "file": "iiib-dust-group-class-ii-group-f.md", "generated": true, "harvested": "2026-08-06", "id": "iiib-dust-group-class-ii-group-f", "iec_designation": "IIIB", "north_american_designation": "Class II, Group F", "source_quote": "Gas / dust group | Typical Substances | IIC | Acetylene | Class I, Group A | Acetylene | IIB + H 2 | 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 |", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "Class II, Group F \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Metal dusts", "body": "**Category:** dust group\n\n**North American designation:** Class II, Group E\n\n**IEC / ATEX designation:** IIIC\n\n**Basis or note:** Metal dusts\n\n> Gas / dust group | Typical Substances | IIC | Acetylene | Class I, Group A | Acetylene | IIB + H 2 | 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 |\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "dust group", "file": "iiic-dust-group-class-ii-group-e.md", "generated": true, "harvested": "2026-08-06", "id": "iiic-dust-group-class-ii-group-e", "iec_designation": "IIIC", "north_american_designation": "Class II, Group E", "source_quote": "Gas / dust group | Typical Substances | IIC | Acetylene | Class I, Group A | Acetylene | IIB + H 2 | 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 |", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "Class II, Group E \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Certification body", "body": "**Category:** system attribute\n\n**North American designation:** NRTLs (UL, FM, CSA)\n\n**IEC / ATEX designation:** Notified Bodies (ATEX) / ExCBs (IECEx)\n\n**Basis or note:** Certification body\n\n> Certification body | NRTLs (UL, FM, CSA) | NRTLs | Notified Bodies (ATEX) / ExCBs (IECEx)\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "system attribute", "file": "notified-bodies-atex-excbs-iecex-system-attribute-nrtls-ul-fm-csa.md", "generated": true, "harvested": "2026-08-06", "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_quote": "Certification body | NRTLs (UL, FM, CSA) | NRTLs | Notified Bodies (ATEX) / ExCBs (IECEx)", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "NRTLs (UL, FM, CSA) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T1\n\n**IEC / ATEX designation:** T1\n\n**Maximum surface temperature (C):** 450\n\n**Maximum surface temperature (F):** 842\n\n> T1 | T1 | 450 | 842\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "t1-temperature-code-t1-2.md", "generated": true, "harvested": "2026-08-06", "id": "t1-temperature-code-t1-2", "iec_designation": "T1", "max_surface_temperature_c": "450", "max_surface_temperature_f": "842", "north_american_designation": "T1", "source_quote": "T1 | T1 | 450 | 842", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T1 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T1\n\n**IEC / ATEX designation:** T1\n\n**Maximum surface temperature (C):** 450\n\n> T1 | 450\u00b0C |\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "temperature code", "file": "t1-temperature-code-t1-3.md", "generated": true, "harvested": "2026-08-06", "id": "t1-temperature-code-t1-3", "iec_designation": "T1", "max_surface_temperature_c": "450", "north_american_designation": "T1", "source_quote": "T1 | 450\u00b0C |", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "T1 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >450", "body": "**Category:** temperature code\n\n**North American designation:** T1\n\n**IEC / ATEX designation:** T1\n\n**Maximum surface temperature (C):** 450\n\n**Basis or note:** Ignition temperature of gas / dust >450\n\n> 450 | T1 | >450\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "t1-temperature-code-t1.md", "generated": true, "harvested": "2026-08-06", "id": "t1-temperature-code-t1", "iec_designation": "T1", "max_surface_temperature_c": "450", "north_american_designation": "T1", "source_quote": "450 | T1 | >450", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T1 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T2\n\n**IEC / ATEX designation:** T2\n\n**Maximum surface temperature (C):** 300\n\n**Maximum surface temperature (F):** 572\n\n> T2 | T2 | 300 | 572\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "t2-temperature-code-t2-2.md", "generated": true, "harvested": "2026-08-06", "id": "t2-temperature-code-t2-2", "iec_designation": "T2", "max_surface_temperature_c": "300", "max_surface_temperature_f": "572", "north_american_designation": "T2", "source_quote": "T2 | T2 | 300 | 572", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T2 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T2\n\n**IEC / ATEX designation:** T2\n\n**Maximum surface temperature (C):** 300\n\n> T2 | 300\u00b0C |\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "temperature code", "file": "t2-temperature-code-t2-3.md", "generated": true, "harvested": "2026-08-06", "id": "t2-temperature-code-t2-3", "iec_designation": "T2", "max_surface_temperature_c": "300", "north_american_designation": "T2", "source_quote": "T2 | 300\u00b0C |", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "T2 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >300-450", "body": "**Category:** temperature code\n\n**North American designation:** T2\n\n**IEC / ATEX designation:** T2\n\n**Maximum surface temperature (C):** 300\n\n**Basis or note:** Ignition temperature of gas / dust >300-450\n\n> 300 | T2 | >300-450\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "t2-temperature-code-t2.md", "generated": true, "harvested": "2026-08-06", "id": "t2-temperature-code-t2", "iec_designation": "T2", "max_surface_temperature_c": "300", "north_american_designation": "T2", "source_quote": "300 | T2 | >300-450", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T2 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T3\n\n**IEC / ATEX designation:** T3\n\n**Maximum surface temperature (C):** 200\n\n**Maximum surface temperature (F):** 392\n\n> T3 | T3 | 200 | 392\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "t3-temperature-code-t3-2.md", "generated": true, "harvested": "2026-08-06", "id": "t3-temperature-code-t3-2", "iec_designation": "T3", "max_surface_temperature_c": "200", "max_surface_temperature_f": "392", "north_american_designation": "T3", "source_quote": "T3 | T3 | 200 | 392", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T3 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T3\n\n**IEC / ATEX designation:** T3\n\n**Maximum surface temperature (C):** 200\n\n> T3 | 200\u00b0C |\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "temperature code", "file": "t3-temperature-code-t3-3.md", "generated": true, "harvested": "2026-08-06", "id": "t3-temperature-code-t3-3", "iec_designation": "T3", "max_surface_temperature_c": "200", "north_american_designation": "T3", "source_quote": "T3 | 200\u00b0C |", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "T3 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >200-300", "body": "**Category:** temperature code\n\n**North American designation:** T3\n\n**IEC / ATEX designation:** T3\n\n**Maximum surface temperature (C):** 200\n\n**Basis or note:** Ignition temperature of gas / dust >200-300\n\n> 200 | T3 | >200-300\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "t3-temperature-code-t3.md", "generated": true, "harvested": "2026-08-06", "id": "t3-temperature-code-t3", "iec_designation": "T3", "max_surface_temperature_c": "200", "north_american_designation": "T3", "source_quote": "200 | T3 | >200-300", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T3 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T4\n\n**IEC / ATEX designation:** T4\n\n**Maximum surface temperature (C):** 135\n\n**Maximum surface temperature (F):** 275\n\n> T4 | T4 | 135 | 275\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "t4-temperature-code-t4-2.md", "generated": true, "harvested": "2026-08-06", "id": "t4-temperature-code-t4-2", "iec_designation": "T4", "max_surface_temperature_c": "135", "max_surface_temperature_f": "275", "north_american_designation": "T4", "source_quote": "T4 | T4 | 135 | 275", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T4 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T4\n\n**IEC / ATEX designation:** T4\n\n**Maximum surface temperature (C):** 135\n\n> T4 | 135\u00b0C |\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "temperature code", "file": "t4-temperature-code-t4-3.md", "generated": true, "harvested": "2026-08-06", "id": "t4-temperature-code-t4-3", "iec_designation": "T4", "max_surface_temperature_c": "135", "north_american_designation": "T4", "source_quote": "T4 | 135\u00b0C |", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "T4 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >135-200", "body": "**Category:** temperature code\n\n**North American designation:** T4\n\n**IEC / ATEX designation:** T4\n\n**Maximum surface temperature (C):** 135\n\n**Basis or note:** Ignition temperature of gas / dust >135-200\n\n> 135 | T4 | >135-200\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "t4-temperature-code-t4.md", "generated": true, "harvested": "2026-08-06", "id": "t4-temperature-code-t4", "iec_designation": "T4", "max_surface_temperature_c": "135", "north_american_designation": "T4", "source_quote": "135 | T4 | >135-200", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T4 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T5\n\n**IEC / ATEX designation:** T5\n\n**Maximum surface temperature (C):** 100\n\n**Maximum surface temperature (F):** 212\n\n> T5 | T5 | 100 | 212\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "t5-temperature-code-t5-2.md", "generated": true, "harvested": "2026-08-06", "id": "t5-temperature-code-t5-2", "iec_designation": "T5", "max_surface_temperature_c": "100", "max_surface_temperature_f": "212", "north_american_designation": "T5", "source_quote": "T5 | T5 | 100 | 212", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T5 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T5\n\n**IEC / ATEX designation:** T5\n\n**Maximum surface temperature (C):** 100\n\n> T5 | 100\u00b0C |\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "temperature code", "file": "t5-temperature-code-t5-3.md", "generated": true, "harvested": "2026-08-06", "id": "t5-temperature-code-t5-3", "iec_designation": "T5", "max_surface_temperature_c": "100", "north_american_designation": "T5", "source_quote": "T5 | 100\u00b0C |", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "T5 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >100-135", "body": "**Category:** temperature code\n\n**North American designation:** T5\n\n**IEC / ATEX designation:** T5\n\n**Maximum surface temperature (C):** 100\n\n**Basis or note:** Ignition temperature of gas / dust >100-135\n\n> 100 | T5 | >100-135\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "t5-temperature-code-t5.md", "generated": true, "harvested": "2026-08-06", "id": "t5-temperature-code-t5", "iec_designation": "T5", "max_surface_temperature_c": "100", "north_american_designation": "T5", "source_quote": "100 | T5 | >100-135", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T5 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T6\n\n**IEC / ATEX designation:** T6\n\n**Maximum surface temperature (C):** 85\n\n**Maximum surface temperature (F):** 185\n\n> T6 | T6 | 85 | 185\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "t6-temperature-code-t6-2.md", "generated": true, "harvested": "2026-08-06", "id": "t6-temperature-code-t6-2", "iec_designation": "T6", "max_surface_temperature_c": "85", "max_surface_temperature_f": "185", "north_american_designation": "T6", "source_quote": "T6 | T6 | 85 | 185", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T6 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T6\n\n**IEC / ATEX designation:** T6\n\n**Maximum surface temperature (C):** 85\n\n> T6 | 85\u00b0C |\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "temperature code", "file": "t6-temperature-code-t6-3.md", "generated": true, "harvested": "2026-08-06", "id": "t6-temperature-code-t6-3", "iec_designation": "T6", "max_surface_temperature_c": "85", "north_american_designation": "T6", "source_quote": "T6 | 85\u00b0C |", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "T6 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >85-100", "body": "**Category:** temperature code\n\n**North American designation:** T6\n\n**IEC / ATEX designation:** T6\n\n**Maximum surface temperature (C):** 85\n\n**Basis or note:** Ignition temperature of gas / dust >85-100\n\n> 85 | T6 | >85-100\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "t6-temperature-code-t6.md", "generated": true, "harvested": "2026-08-06", "id": "t6-temperature-code-t6", "iec_designation": "T6", "max_surface_temperature_c": "85", "north_american_designation": "T6", "source_quote": "85 | T6 | >85-100", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T6 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T2A\n\n**Maximum surface temperature (C):** 280\n\n**Maximum surface temperature (F):** 536\n\n> T2A | | 280 | 536\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "temperature-code-t2a-2.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t2a-2", "max_surface_temperature_c": "280", "max_surface_temperature_f": "536", "north_american_designation": "T2A", "source_quote": "T2A | | 280 | 536", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T2A \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >280-300", "body": "**Category:** temperature code\n\n**North American designation:** T2A\n\n**Maximum surface temperature (C):** 280\n\n**Basis or note:** Ignition temperature of gas / dust >280-300\n\n> 280 | T2A | >280-300\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "temperature-code-t2a.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t2a", "max_surface_temperature_c": "280", "north_american_designation": "T2A", "source_quote": "280 | T2A | >280-300", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T2A \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T2B\n\n**Maximum surface temperature (C):** 260\n\n**Maximum surface temperature (F):** 500\n\n> T2B | | 260 | 500\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "temperature-code-t2b-2.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t2b-2", "max_surface_temperature_c": "260", "max_surface_temperature_f": "500", "north_american_designation": "T2B", "source_quote": "T2B | | 260 | 500", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T2B \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >260-280", "body": "**Category:** temperature code\n\n**North American designation:** T2B\n\n**Maximum surface temperature (C):** 260\n\n**Basis or note:** Ignition temperature of gas / dust >260-280\n\n> 260 | T2B | >260-280\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "temperature-code-t2b.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t2b", "max_surface_temperature_c": "260", "north_american_designation": "T2B", "source_quote": "260 | T2B | >260-280", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T2B \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T2C\n\n**Maximum surface temperature (C):** 230\n\n**Maximum surface temperature (F):** 446\n\n> T2C | | 230 | 446\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "temperature-code-t2c-2.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t2c-2", "max_surface_temperature_c": "230", "max_surface_temperature_f": "446", "north_american_designation": "T2C", "source_quote": "T2C | | 230 | 446", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T2C \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >230-260", "body": "**Category:** temperature code\n\n**North American designation:** T2C\n\n**Maximum surface temperature (C):** 230\n\n**Basis or note:** Ignition temperature of gas / dust >230-260\n\n> 230 | T2C | >230-260\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "temperature-code-t2c.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t2c", "max_surface_temperature_c": "230", "north_american_designation": "T2C", "source_quote": "230 | T2C | >230-260", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T2C \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T2D\n\n**Maximum surface temperature (C):** 215\n\n**Maximum surface temperature (F):** 419\n\n> T2D | | 215 | 419\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "temperature-code-t2d-2.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t2d-2", "max_surface_temperature_c": "215", "max_surface_temperature_f": "419", "north_american_designation": "T2D", "source_quote": "T2D | | 215 | 419", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T2D \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >215-230", "body": "**Category:** temperature code\n\n**North American designation:** T2D\n\n**Maximum surface temperature (C):** 215\n\n**Basis or note:** Ignition temperature of gas / dust >215-230\n\n> 215 | T2D | >215-230\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "temperature-code-t2d.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t2d", "max_surface_temperature_c": "215", "north_american_designation": "T2D", "source_quote": "215 | T2D | >215-230", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T2D \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T3A\n\n**Maximum surface temperature (C):** 180\n\n**Maximum surface temperature (F):** 356\n\n> T3A | | 180 | 356\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "temperature-code-t3a-2.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t3a-2", "max_surface_temperature_c": "180", "max_surface_temperature_f": "356", "north_american_designation": "T3A", "source_quote": "T3A | | 180 | 356", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T3A \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >180-200", "body": "**Category:** temperature code\n\n**North American designation:** T3A\n\n**Maximum surface temperature (C):** 180\n\n**Basis or note:** Ignition temperature of gas / dust >180-200\n\n> 180 | T3A | >180-200\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "temperature-code-t3a.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t3a", "max_surface_temperature_c": "180", "north_american_designation": "T3A", "source_quote": "180 | T3A | >180-200", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T3A \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T3B\n\n**Maximum surface temperature (C):** 165\n\n**Maximum surface temperature (F):** 329\n\n> T3B | | 165 | 329\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "temperature-code-t3b-2.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t3b-2", "max_surface_temperature_c": "165", "max_surface_temperature_f": "329", "north_american_designation": "T3B", "source_quote": "T3B | | 165 | 329", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T3B \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >165-180", "body": "**Category:** temperature code\n\n**North American designation:** T3B\n\n**Maximum surface temperature (C):** 165\n\n**Basis or note:** Ignition temperature of gas / dust >165-180\n\n> 165 | T3B | >165-180\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "temperature-code-t3b.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t3b", "max_surface_temperature_c": "165", "north_american_designation": "T3B", "source_quote": "165 | T3B | >165-180", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T3B \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T3C\n\n**Maximum surface temperature (C):** 160\n\n**Maximum surface temperature (F):** 320\n\n> T3C | | 160 | 320\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "temperature-code-t3c-2.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t3c-2", "max_surface_temperature_c": "160", "max_surface_temperature_f": "320", "north_american_designation": "T3C", "source_quote": "T3C | | 160 | 320", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T3C \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >160-165", "body": "**Category:** temperature code\n\n**North American designation:** T3C\n\n**Maximum surface temperature (C):** 160\n\n**Basis or note:** Ignition temperature of gas / dust >160-165\n\n> 160 | T3C | >160-165\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "temperature-code-t3c.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t3c", "max_surface_temperature_c": "160", "north_american_designation": "T3C", "source_quote": "160 | T3C | >160-165", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T3C \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "body": "**Category:** temperature code\n\n**North American designation:** T4A\n\n**Maximum surface temperature (C):** 120\n\n**Maximum surface temperature (F):** 248\n\n> T4A | | 120 | 248\n\nSource: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>\n", "category": "temperature code", "file": "temperature-code-t4a-2.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t4a-2", "max_surface_temperature_c": "120", "max_surface_temperature_f": "248", "north_american_designation": "T4A", "source_quote": "T4A | | 120 | 248", "sources": ["https://ldpi-inc.com/resources/classification-codes/class-1-locations/"], "stale_after": "2028-08-05", "title": "T4A \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Ignition temperature of gas / dust >120-135", "body": "**Category:** temperature code\n\n**North American designation:** T4A\n\n**Maximum surface temperature (C):** 120\n\n**Basis or note:** Ignition temperature of gas / dust >120-135\n\n> 120 | T4A | >120-135\n\nSource: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>\n", "category": "temperature code", "file": "temperature-code-t4a.md", "generated": true, "harvested": "2026-08-06", "id": "temperature-code-t4a", "max_surface_temperature_c": "120", "north_american_designation": "T4A", "source_quote": "120 | T4A | >120-135", "sources": ["https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups"], "stale_after": "2028-08-05", "title": "T4A \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "basis, category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Flammable gases and vapors", "body": "**Category:** area classification\n\n**North American designation:** Class I\n\n**IEC / ATEX designation:** Zone 0, 1, 2 (gas)\n\n**Basis or note:** Flammable gases and vapors\n\n> Class I | Flammable gases and vapors\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-0-1-2-gas-area-classification-class-i.md", "generated": true, "harvested": "2026-08-06", "id": "zone-0-1-2-gas-area-classification-class-i", "iec_designation": "Zone 0, 1, 2 (gas)", "north_american_designation": "Class I", "source_quote": "Class I | Flammable gases and vapors", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Class I \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "iec_designation", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Hazard basis", "body": "**Category:** system attribute\n\n**North American designation:** Class I (gas), II (dust), III (fibers)\n\n**IEC / ATEX designation:** Zone 0, 1, 2 (gas); Zone 20, 21, 22 (dust)\n\n**Basis or note:** Hazard basis\n\n> 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)\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "system attribute", "file": "zone-0-1-2-gas-zone-20-21-22-dust-system-attribute-class-i-gas-ii-dust-iii-fibers.md", "generated": true, "harvested": "2026-08-06", "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_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)", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Class I (gas), II (dust), III (fibers) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Continuous hazard", "body": "**Category:** area classification\n\n**North American designation:** Class I Division 1\n\n**IEC / ATEX designation:** Zone 0\n\n**Basis or note:** Continuous hazard\n\n> Continuous hazard | Class I Division 1 | Zone 0\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-0-area-classification-class-i-division-1.md", "generated": true, "harvested": "2026-08-06", "id": "zone-0-area-classification-class-i-division-1", "iec_designation": "Zone 0", "north_american_designation": "Class I Division 1", "source_quote": "Continuous hazard | Class I Division 1 | Zone 0", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Class I Division 1 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Explosive atmosphere continuously or for long periods (>1000 hrs/yr)", "body": "**Category:** area classification\n\n**North American designation:** (no NEC 500 equivalent)\n\n**IEC / ATEX designation:** Zone 0\n\n**Basis or note:** Explosive atmosphere continuously or for long periods (>1000 hrs/yr)\n\n> Zone 0 | Explosive atmosphere continuously or for long periods (>1000 hrs/yr)\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "area classification", "file": "zone-0-area-classification-no-nec-500-equivalent.md", "generated": true, "harvested": "2026-08-06", "id": "zone-0-area-classification-no-nec-500-equivalent", "iec_designation": "Zone 0", "north_american_designation": "(no NEC 500 equivalent)", "source_quote": "Zone 0 | Explosive atmosphere continuously or for long periods (>1000 hrs/yr)", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "(no NEC 500 equivalent) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Explosive atmosphere present continuously or for long periods", "body": "**Category:** area classification\n\n**North American designation:** (no NEC equivalent)\n\n**IEC / ATEX designation:** Zone 0\n\n**Basis or note:** Explosive atmosphere present continuously or for long periods\n\n> Zone 0 | Explosive atmosphere present continuously or for long periods\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-0-area-classification-no-nec-equivalent.md", "generated": true, "harvested": "2026-08-06", "id": "zone-0-area-classification-no-nec-equivalent", "iec_designation": "Zone 0", "north_american_designation": "(no NEC equivalent)", "source_quote": "Zone 0 | Explosive atmosphere present continuously or for long periods", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "(no NEC equivalent) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Hazard present during normal operation", "body": "**Category:** area classification\n\n**North American designation:** Division 1\n\n**IEC / ATEX designation:** Zone 0 / Zone 1\n\n**Basis or note:** Hazard present during normal operation\n\n> Division 1 | Hazard present during normal operation\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-0-zone-1-area-classification-division-1.md", "generated": true, "harvested": "2026-08-06", "id": "zone-0-zone-1-area-classification-division-1", "iec_designation": "Zone 0 / Zone 1", "north_american_designation": "Division 1", "source_quote": "Division 1 | Hazard present during normal operation", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Division 1 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "iec_designation", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Frequent hazard", "body": "**Category:** area classification\n\n**North American designation:** Class I Division 1\n\n**IEC / ATEX designation:** Zone 1\n\n**Basis or note:** Frequent hazard\n\n> Frequent hazard | Class I Division 1 | Zone 1\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-1-area-classification-class-i-division-1.md", "generated": true, "harvested": "2026-08-06", "id": "zone-1-area-classification-class-i-division-1", "iec_designation": "Zone 1", "north_american_designation": "Class I Division 1", "source_quote": "Frequent hazard | Class I Division 1 | Zone 1", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Class I Division 1 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Explosive atmosphere likely during normal operation", "body": "**Category:** area classification\n\n**North American designation:** (no NEC equivalent)\n\n**IEC / ATEX designation:** Zone 1\n\n**Basis or note:** Explosive atmosphere likely during normal operation\n\n> Zone 1 | Explosive atmosphere likely during normal operation\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-1-area-classification-no-nec-equivalent.md", "generated": true, "harvested": "2026-08-06", "id": "zone-1-area-classification-no-nec-equivalent", "iec_designation": "Zone 1", "north_american_designation": "(no NEC equivalent)", "source_quote": "Zone 1 | Explosive atmosphere likely during normal operation", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "(no NEC equivalent) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Explosive atmosphere likely during normal operation (10\u20131000 hrs/yr)", "body": "**Category:** area classification\n\n**North American designation:** Division 1\n\n**IEC / ATEX designation:** Zone 1 (+ Zone 0)\n\n**Basis or note:** Explosive atmosphere likely during normal operation (10\u20131000 hrs/yr)\n\n> Division 1 | Zone 1 (+ Zone 0) | Explosive atmosphere likely during normal operation (10\u20131000 hrs/yr)\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "area classification", "file": "zone-1-zone-0-area-classification-division-1.md", "generated": true, "harvested": "2026-08-06", "id": "zone-1-zone-0-area-classification-division-1", "iec_designation": "Zone 1 (+ Zone 0)", "north_american_designation": "Division 1", "source_quote": "Division 1 | Zone 1 (+ Zone 0) | Explosive atmosphere likely during normal operation (10\u20131000 hrs/yr)", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Division 1 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Occasional hazard", "body": "**Category:** area classification\n\n**North American designation:** Class I Division 2\n\n**IEC / ATEX designation:** Zone 2\n\n**Basis or note:** Occasional hazard\n\n> Occasional hazard | Class I Division 2 | Zone 2\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-2-area-classification-class-i-division-2.md", "generated": true, "harvested": "2026-08-06", "id": "zone-2-area-classification-class-i-division-2", "iec_designation": "Zone 2", "north_american_designation": "Class I Division 2", "source_quote": "Occasional hazard | Class I Division 2 | Zone 2", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Class I Division 2 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Hazard present only under abnormal conditions", "body": "**Category:** area classification\n\n**North American designation:** Division 2\n\n**IEC / ATEX designation:** Zone 2\n\n**Basis or note:** Hazard present only under abnormal conditions\n\n> Division 2 | Hazard present only under abnormal conditions\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-2-area-classification-division-2-2.md", "generated": true, "harvested": "2026-08-06", "id": "zone-2-area-classification-division-2-2", "iec_designation": "Zone 2", "north_american_designation": "Division 2", "source_quote": "Division 2 | Hazard present only under abnormal conditions", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Division 2 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, iec_designation", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Explosive atmosphere not likely; only abnormal conditions (<10 hrs/yr)", "body": "**Category:** area classification\n\n**North American designation:** Division 2\n\n**IEC / ATEX designation:** Zone 2\n\n**Basis or note:** Explosive atmosphere not likely; only abnormal conditions (<10 hrs/yr)\n\n> Division 2 | Zone 2 | Explosive atmosphere not likely; only abnormal conditions (<10 hrs/yr)\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "area classification", "file": "zone-2-area-classification-division-2.md", "generated": true, "harvested": "2026-08-06", "id": "zone-2-area-classification-division-2", "iec_designation": "Zone 2", "north_american_designation": "Division 2", "source_quote": "Division 2 | Zone 2 | Explosive atmosphere not likely; only abnormal conditions (<10 hrs/yr)", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Division 2 \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Explosive atmosphere unlikely in normal operation, only short duration eg. accidental leakage", "body": "**Category:** area classification\n\n**North American designation:** (no NEC equivalent)\n\n**IEC / ATEX designation:** Zone 2\n\n**Basis or note:** Explosive atmosphere unlikely in normal operation, only short duration eg. accidental leakage\n\n> Zone 2 | Explosive atmosphere unlikely in normal operation, only short duration eg. accidental leakage\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-2-area-classification-no-nec-equivalent.md", "generated": true, "harvested": "2026-08-06", "id": "zone-2-area-classification-no-nec-equivalent", "iec_designation": "Zone 2", "north_american_designation": "(no NEC equivalent)", "source_quote": "Zone 2 | Explosive atmosphere unlikely in normal operation, only short duration eg. accidental leakage", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "(no NEC equivalent) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Combustible dust", "body": "**Category:** area classification\n\n**North American designation:** Class II\n\n**IEC / ATEX designation:** Zone 20, 21, 22 (dust)\n\n**Basis or note:** Combustible dust\n\n> Class II | Combustible dust\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-20-21-22-dust-area-classification-class-ii.md", "generated": true, "harvested": "2026-08-06", "id": "zone-20-21-22-dust-area-classification-class-ii", "iec_designation": "Zone 20, 21, 22 (dust)", "north_american_designation": "Class II", "source_quote": "Class II | Combustible dust", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "Class II \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, iec_designation", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Dust classification", "body": "**Category:** system attribute\n\n**North American designation:** Class II Groups E, F, G\n\n**IEC / ATEX designation:** Zone 20, 21, 22 (IIIA, IIIB, IIIC)\n\n**Basis or note:** Dust classification\n\n> Dust classification | Class II Groups E, F, G | Not covered | Zone 20, 21, 22 (IIIA, IIIB, IIIC)\n\nSource: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>\n", "category": "system attribute", "file": "zone-20-21-22-iiia-iiib-iiic-system-attribute-class-ii-groups-e-f-g.md", "generated": true, "harvested": "2026-08-06", "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_quote": "Dust classification | Class II Groups E, F, G | Not covered | Zone 20, 21, 22 (IIIA, IIIB, IIIC)", "sources": ["https://exknowledge.com/pages/nec-500-vs-atex-iec.html"], "stale_after": "2028-08-05", "title": "Class II Groups E, F, G \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category", "verified": true}
{"asset": "ex-classification-system-crosswalk", "basis": "Combustible dust present continuously", "body": "**Category:** area classification\n\n**North American designation:** (no NEC equivalent)\n\n**IEC / ATEX designation:** Zone 20\n\n**Basis or note:** Combustible dust present continuously\n\n> Zone 20 | Combustible dust present continuously\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-20-area-classification-no-nec-equivalent.md", "generated": true, "harvested": "2026-08-06", "id": "zone-20-area-classification-no-nec-equivalent", "iec_designation": "Zone 20", "north_american_designation": "(no NEC equivalent)", "source_quote": "Zone 20 | Combustible dust present continuously", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "(no NEC equivalent) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Dust likely during normal operation", "body": "**Category:** area classification\n\n**North American designation:** (no NEC equivalent)\n\n**IEC / ATEX designation:** Zone 21\n\n**Basis or note:** Dust likely during normal operation\n\n> Zone 21 | Dust likely during normal operation\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-21-area-classification-no-nec-equivalent.md", "generated": true, "harvested": "2026-08-06", "id": "zone-21-area-classification-no-nec-equivalent", "iec_designation": "Zone 21", "north_american_designation": "(no NEC equivalent)", "source_quote": "Zone 21 | Dust likely during normal operation", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "(no NEC equivalent) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "north_american_designation", "verified": false}
{"asset": "ex-classification-system-crosswalk", "basis": "Dust unlikely except briefly", "body": "**Category:** area classification\n\n**North American designation:** (no NEC equivalent)\n\n**IEC / ATEX designation:** Zone 22\n\n**Basis or note:** Dust unlikely except briefly\n\n> Zone 22 | Dust unlikely except briefly\n\nSource: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>\n", "category": "area classification", "file": "zone-22-area-classification-no-nec-equivalent.md", "generated": true, "harvested": "2026-08-06", "id": "zone-22-area-classification-no-nec-equivalent", "iec_designation": "Zone 22", "north_american_designation": "(no NEC equivalent)", "source_quote": "Zone 22 | Dust unlikely except briefly", "sources": ["https://www.inframena.com/hazardous-area-classification-equivalency-guide/"], "stale_after": "2028-08-05", "title": "(no NEC equivalent) \u2014 North American vs IEC/ATEX explosion protection designations", "type": "equivalence", "unverified_fields": "category, north_american_designation", "verified": false}