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.

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.

North American vs IEC/ATEX explosion protection designations


**Category:** system attribute

**North American designation:** 2 levels (Div 1, Div 2)

**IEC / ATEX designation:** 3 levels (Zone 0, 1, 2)

**Basis or note:** Risk gradation

> Risk gradation | 2 levels (Div 1, Div 2) | 3 levels (Zone 0, 1, 2) | 3 levels (Zone 0, 1, 2)

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

2 levels (Div 1, Div 2) — North American vs IEC/ATEX explosion protection designations


**Category:** area classification

**North American designation:** Class III

**Basis or note:** Ignitable fibers

> Class III | Ignitable fibers

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Class III — North American vs IEC/ATEX explosion protection designations


**Category:** system attribute

**North American designation:** NEC 500 (Class/Division)

**IEC / ATEX designation:** ATEX / IECEx (Zone)

**Basis or note:** Geographic use: USA, Canada vs EU, UK, most of the world

> Geographic use | USA, Canada | USA, Canada | EU, UK, most of the world

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

NEC 500 (Class/Division) — North American vs IEC/ATEX explosion protection designations


**Category:** dust group

**North American designation:** Class II, Group G

**Basis or note:** Grain, flour, plastic dusts

> Class II, Group G

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>

Class II, Group G — North American vs IEC/ATEX explosion protection designations


**Category:** system attribute

**North American designation:** NFPA 70 (adopted by AHJs)

**IEC / ATEX designation:** EU Directive 2014/34/EU / IECEx scheme

**Basis or note:** Legal framework

> Legal framework | NFPA 70 (adopted by AHJs) | NFPA 70 (adopted by AHJs) | EU Directive 2014/34/EU / IECEx scheme

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

NFPA 70 (adopted by AHJs) — North American vs IEC/ATEX explosion protection designations


**Category:** protection concept

**North American designation:** Explosion-proof (XP)

**IEC / ATEX designation:** Ex d (Flameproof)

**IEC standard:** IEC 60079-1

**Basis or note:** Contain the explosion inside the enclosure

> Explosion-proof (XP) | Ex d (Flameproof) | IEC 60079-1 | Contain the explosion inside the enclosure

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

Explosion-proof (XP) — North American vs IEC/ATEX explosion protection designations


**Category:** protection concept

**North American designation:** Flameproof enclosure

**IEC / ATEX designation:** Ex d

**Basis or note:** Flameproof enclosure

> Ex d | Flameproof enclosure

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Flameproof enclosure — North American vs IEC/ATEX explosion protection designations


**Category:** protection concept

**North American designation:** Increased safety

**IEC / ATEX designation:** Ex e

**Basis or note:** Increased safety

> Ex e | Increased safety

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Increased safety — North American vs IEC/ATEX explosion protection designations


**Category:** protection concept

**North American designation:** Intrinsically Safe (IS)

**IEC / ATEX designation:** Ex i (Ex ia, Ex ib)

**IEC standard:** IEC 60079-11

**Basis or note:** Limit energy below ignition threshold

> Intrinsically Safe (IS) | Ex i (Ex ia, Ex ib) | IEC 60079-11 | Limit energy below ignition threshold

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

Intrinsically Safe (IS) — North American vs IEC/ATEX explosion protection designations


**Category:** protection concept

**North American designation:** Intrinsically Safe

**IEC / ATEX designation:** Ex i

**Basis or note:** Intrinsic safety

> Ex i | Intrinsic safety

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Intrinsically Safe — North American vs IEC/ATEX explosion protection designations


**Category:** protection concept

**North American designation:** Encapsulation

**IEC / ATEX designation:** Ex m

**Basis or note:** Encapsulation

> Ex m | Encapsulation

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Encapsulation — North American vs IEC/ATEX explosion protection designations


**Category:** protection concept

**North American designation:** Non-incendive

**IEC / ATEX designation:** Ex nA / Ex ec

**IEC standard:** IEC 60079-15 / -7

**Basis or note:** Normal operation cannot cause ignition

> Non-incendive | Ex nA / Ex ec | IEC 60079-15 / -7 | Normal operation cannot cause ignition

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

Non-incendive — North American vs IEC/ATEX explosion protection designations


**Category:** protection concept

**North American designation:** Hermetically sealed

**IEC / ATEX designation:** Ex nC / Ex m

**IEC standard:** IEC 60079-15 / -18

**Basis or note:** Seal ignition source from atmosphere

> Hermetically sealed | Ex nC / Ex m | IEC 60079-15 / -18 | Seal ignition source from atmosphere

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

Hermetically sealed — North American vs IEC/ATEX explosion protection designations


**Category:** protection concept

**North American designation:** Purged/Pressurized

**IEC / ATEX designation:** Ex p (Ex px, Ex py, Ex pz)

**IEC standard:** IEC 60079-2

**Basis or note:** Maintain positive pressure with inert gas

> Purged/Pressurized | Ex p (Ex px, Ex py, Ex pz) | IEC 60079-2 | Maintain positive pressure with inert gas

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

Purged/Pressurized — North American vs IEC/ATEX explosion protection designations


**Category:** protection concept

**North American designation:** Pressurization

**IEC / ATEX designation:** Ex p

**Basis or note:** Pressurization

> Ex p | Pressurization

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Pressurization — North American vs IEC/ATEX explosion protection designations


**Category:** protection concept

**North American designation:** Dust-ignition-proof

**IEC / ATEX designation:** Ex t (Dust protection by enclosure)

**IEC standard:** IEC 60079-31

**Basis or note:** Prevent dust ingress and limit surface temperature

> Dust-ignition-proof | Ex t (Dust protection by enclosure) | IEC 60079-31 | Prevent dust ingress and limit surface temperature

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

Dust-ignition-proof — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Group E

**Basis or note:** Metal dust

> E | Metal dust

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Group E — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Group F

**Basis or note:** Carbon dust

> F | Carbon dust

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Group F — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Group G

**Basis or note:** Grain / flour dust

> G | Grain / flour dust

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Group G — North American vs IEC/ATEX explosion protection designations


**Category:** system attribute

**North American designation:** Groups A, B, C, D

**IEC / ATEX designation:** Groups IIC, IIB, IIA

**Basis or note:** Gas classification

> Gas classification | Groups A, B, C, D | Groups IIC, IIB, IIA | Groups IIC, IIB, IIA

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

Groups A, B, C, D — North American vs IEC/ATEX explosion protection designations


**Category:** system attribute

**North American designation:** Explosion-proof (XP), intrinsically safe (IS)

**IEC / ATEX designation:** IEC-aligned types (Ex d, Ex i, Ex e, etc.)

**Basis or note:** Protection concept

> 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.)

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

Explosion-proof (XP), intrinsically safe (IS) — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Class I, Group D

**IEC / ATEX designation:** IIA

**Basis or note:** Propane

> IIA | Propane | Class I, Group D |

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>

Class I, Group D — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Group D

**IEC / ATEX designation:** IIA

**Basis or note:** Gasoline

> Gasoline | D | 280 | 536 | 600 PSI | IIA

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

Group D — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Group D

**IEC / ATEX designation:** IIA

**Basis or note:** Propane

> D (Propane) | IIA

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** gas group

**North American designation:** Group D

**IEC / ATEX designation:** IIA

**Basis or note:** MESG >0.90 mm

> D | IIA | Methane, propane, gasoline | >0.90 mm

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>


**Category:** gas group

**North American designation:** Class I, Group C

**IEC / ATEX designation:** IIB

**Basis or note:** Ethylene

> IIB | Ethylene | Class I, Group C | Ethylene

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>

Class I, Group C — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Group C

**IEC / ATEX designation:** IIB

**Basis or note:** Ethylene

> Ethylene | C | 450 | 842 | 1,200 PSI | IIB

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

Group C — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Group C

**IEC / ATEX designation:** IIB

**Basis or note:** MESG 0.50–0.90 mm

> C | IIB | Ethylene, ethyl ether | 0.50–0.90 mm

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>


**Category:** gas group

**North American designation:** Class I, Group B

**IEC / ATEX designation:** IIB + H2

**Basis or note:** Hydrogen

> IIB + H 2 | Hydrogen | Class I, Group B | Hydrogen

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>

Class I, Group B — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Class I, Group A

**IEC / ATEX designation:** IIC

**Basis or note:** Acetylene

> IIC | Acetylene | Class I, Group A | Acetylene

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>

Class I, Group A — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Group A

**IEC / ATEX designation:** IIC

**Basis or note:** Acetylene

> Acetylene | A | 305 | 581 | 6,000 PSI | IIC

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

Group A — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Group A

**IEC / ATEX designation:** IIC

**Basis or note:** MESG <0.50 mm

> A | IIC | Acetylene | <0.50 mm

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>


**Category:** gas group

**North American designation:** Group B

**IEC / ATEX designation:** IIC

**Basis or note:** Hydrogen

> Hydrogen | B | 520 | 968 | 6,000 PSI | IIC

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

Group B — North American vs IEC/ATEX explosion protection designations


**Category:** gas group

**North American designation:** Group B

**IEC / ATEX designation:** IIC (partially IIB+H₂)

**Basis or note:** MESG <0.50 mm

> B | IIC (partially IIB+H₂) | Hydrogen, butadiene | <0.50 mm

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>


**Category:** dust group

**North American designation:** Class III

**IEC / ATEX designation:** IIIA

**Basis or note:** Fibers and flyings

> 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 |

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>

Class III — North American vs IEC/ATEX explosion protection designations


**Category:** dust group

**North American designation:** Class II, Group F

**IEC / ATEX designation:** IIIB

**Basis or note:** Carbon dusts

> 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 |

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>

Class II, Group F — North American vs IEC/ATEX explosion protection designations


**Category:** dust group

**North American designation:** Class II, Group E

**IEC / ATEX designation:** IIIC

**Basis or note:** Metal dusts

> 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 |

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>

Class II, Group E — North American vs IEC/ATEX explosion protection designations


**Category:** system attribute

**North American designation:** NRTLs (UL, FM, CSA)

**IEC / ATEX designation:** Notified Bodies (ATEX) / ExCBs (IECEx)

**Basis or note:** Certification body

> Certification body | NRTLs (UL, FM, CSA) | NRTLs | Notified Bodies (ATEX) / ExCBs (IECEx)

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

NRTLs (UL, FM, CSA) — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T1

**IEC / ATEX designation:** T1

**Maximum surface temperature (C):** 450

**Maximum surface temperature (F):** 842

> T1 | T1 | 450 | 842

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T1 — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T1

**IEC / ATEX designation:** T1

**Maximum surface temperature (C):** 450

> T1 | 450°C |

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** temperature code

**North American designation:** T1

**IEC / ATEX designation:** T1

**Maximum surface temperature (C):** 450

**Basis or note:** Ignition temperature of gas / dust >450

> 450 | T1 | >450

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T2

**IEC / ATEX designation:** T2

**Maximum surface temperature (C):** 300

**Maximum surface temperature (F):** 572

> T2 | T2 | 300 | 572

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T2 — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T2

**IEC / ATEX designation:** T2

**Maximum surface temperature (C):** 300

> T2 | 300°C |

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** temperature code

**North American designation:** T2

**IEC / ATEX designation:** T2

**Maximum surface temperature (C):** 300

**Basis or note:** Ignition temperature of gas / dust >300-450

> 300 | T2 | >300-450

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T3

**IEC / ATEX designation:** T3

**Maximum surface temperature (C):** 200

**Maximum surface temperature (F):** 392

> T3 | T3 | 200 | 392

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T3 — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T3

**IEC / ATEX designation:** T3

**Maximum surface temperature (C):** 200

> T3 | 200°C |

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** temperature code

**North American designation:** T3

**IEC / ATEX designation:** T3

**Maximum surface temperature (C):** 200

**Basis or note:** Ignition temperature of gas / dust >200-300

> 200 | T3 | >200-300

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T4

**IEC / ATEX designation:** T4

**Maximum surface temperature (C):** 135

**Maximum surface temperature (F):** 275

> T4 | T4 | 135 | 275

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T4 — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T4

**IEC / ATEX designation:** T4

**Maximum surface temperature (C):** 135

> T4 | 135°C |

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** temperature code

**North American designation:** T4

**IEC / ATEX designation:** T4

**Maximum surface temperature (C):** 135

**Basis or note:** Ignition temperature of gas / dust >135-200

> 135 | T4 | >135-200

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T5

**IEC / ATEX designation:** T5

**Maximum surface temperature (C):** 100

**Maximum surface temperature (F):** 212

> T5 | T5 | 100 | 212

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T5 — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T5

**IEC / ATEX designation:** T5

**Maximum surface temperature (C):** 100

> T5 | 100°C |

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** temperature code

**North American designation:** T5

**IEC / ATEX designation:** T5

**Maximum surface temperature (C):** 100

**Basis or note:** Ignition temperature of gas / dust >100-135

> 100 | T5 | >100-135

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T6

**IEC / ATEX designation:** T6

**Maximum surface temperature (C):** 85

**Maximum surface temperature (F):** 185

> T6 | T6 | 85 | 185

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T6 — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T6

**IEC / ATEX designation:** T6

**Maximum surface temperature (C):** 85

> T6 | 85°C |

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** temperature code

**North American designation:** T6

**IEC / ATEX designation:** T6

**Maximum surface temperature (C):** 85

**Basis or note:** Ignition temperature of gas / dust >85-100

> 85 | T6 | >85-100

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T2A

**Maximum surface temperature (C):** 280

**Maximum surface temperature (F):** 536

> T2A | | 280 | 536

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T2A — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T2A

**Maximum surface temperature (C):** 280

**Basis or note:** Ignition temperature of gas / dust >280-300

> 280 | T2A | >280-300

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T2B

**Maximum surface temperature (C):** 260

**Maximum surface temperature (F):** 500

> T2B | | 260 | 500

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T2B — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T2B

**Maximum surface temperature (C):** 260

**Basis or note:** Ignition temperature of gas / dust >260-280

> 260 | T2B | >260-280

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T2C

**Maximum surface temperature (C):** 230

**Maximum surface temperature (F):** 446

> T2C | | 230 | 446

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T2C — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T2C

**Maximum surface temperature (C):** 230

**Basis or note:** Ignition temperature of gas / dust >230-260

> 230 | T2C | >230-260

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T2D

**Maximum surface temperature (C):** 215

**Maximum surface temperature (F):** 419

> T2D | | 215 | 419

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T2D — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T2D

**Maximum surface temperature (C):** 215

**Basis or note:** Ignition temperature of gas / dust >215-230

> 215 | T2D | >215-230

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T3A

**Maximum surface temperature (C):** 180

**Maximum surface temperature (F):** 356

> T3A | | 180 | 356

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T3A — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T3A

**Maximum surface temperature (C):** 180

**Basis or note:** Ignition temperature of gas / dust >180-200

> 180 | T3A | >180-200

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T3B

**Maximum surface temperature (C):** 165

**Maximum surface temperature (F):** 329

> T3B | | 165 | 329

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T3B — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T3B

**Maximum surface temperature (C):** 165

**Basis or note:** Ignition temperature of gas / dust >165-180

> 165 | T3B | >165-180

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T3C

**Maximum surface temperature (C):** 160

**Maximum surface temperature (F):** 320

> T3C | | 160 | 320

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T3C — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T3C

**Maximum surface temperature (C):** 160

**Basis or note:** Ignition temperature of gas / dust >160-165

> 160 | T3C | >160-165

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** temperature code

**North American designation:** T4A

**Maximum surface temperature (C):** 120

**Maximum surface temperature (F):** 248

> T4A | | 120 | 248

Source: <https://ldpi-inc.com/resources/classification-codes/class-1-locations/>

T4A — North American vs IEC/ATEX explosion protection designations


**Category:** temperature code

**North American designation:** T4A

**Maximum surface temperature (C):** 120

**Basis or note:** Ignition temperature of gas / dust >120-135

> 120 | T4A | >120-135

Source: <https://www.e2s.com/guide-for-hazardous-areas/gas-and-dust-groups>


**Category:** area classification

**North American designation:** Class I

**IEC / ATEX designation:** Zone 0, 1, 2 (gas)

**Basis or note:** Flammable gases and vapors

> Class I | Flammable gases and vapors

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Class I — North American vs IEC/ATEX explosion protection designations


**Category:** system attribute

**North American designation:** Class I (gas), II (dust), III (fibers)

**IEC / ATEX designation:** Zone 0, 1, 2 (gas); Zone 20, 21, 22 (dust)

**Basis or note:** Hazard basis

> 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)

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

Class I (gas), II (dust), III (fibers) — North American vs IEC/ATEX explosion protection designations


**Category:** area classification

**North American designation:** Class I Division 1

**IEC / ATEX designation:** Zone 0

**Basis or note:** Continuous hazard

> Continuous hazard | Class I Division 1 | Zone 0

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Class I Division 1 — North American vs IEC/ATEX explosion protection designations


**Category:** area classification

**North American designation:** (no NEC 500 equivalent)

**IEC / ATEX designation:** Zone 0

**Basis or note:** Explosive atmosphere continuously or for long periods (>1000 hrs/yr)

> Zone 0 | Explosive atmosphere continuously or for long periods (>1000 hrs/yr)

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

(no NEC 500 equivalent) — North American vs IEC/ATEX explosion protection designations


**Category:** area classification

**North American designation:** (no NEC equivalent)

**IEC / ATEX designation:** Zone 0

**Basis or note:** Explosive atmosphere present continuously or for long periods

> Zone 0 | Explosive atmosphere present continuously or for long periods

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

(no NEC equivalent) — North American vs IEC/ATEX explosion protection designations


**Category:** area classification

**North American designation:** Division 1

**IEC / ATEX designation:** Zone 0 / Zone 1

**Basis or note:** Hazard present during normal operation

> Division 1 | Hazard present during normal operation

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Division 1 — North American vs IEC/ATEX explosion protection designations


**Category:** area classification

**North American designation:** Class I Division 1

**IEC / ATEX designation:** Zone 1

**Basis or note:** Frequent hazard

> Frequent hazard | Class I Division 1 | Zone 1

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** area classification

**North American designation:** (no NEC equivalent)

**IEC / ATEX designation:** Zone 1

**Basis or note:** Explosive atmosphere likely during normal operation

> Zone 1 | Explosive atmosphere likely during normal operation

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** area classification

**North American designation:** Division 1

**IEC / ATEX designation:** Zone 1 (+ Zone 0)

**Basis or note:** Explosive atmosphere likely during normal operation (10–1000 hrs/yr)

> Division 1 | Zone 1 (+ Zone 0) | Explosive atmosphere likely during normal operation (10–1000 hrs/yr)

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>


**Category:** area classification

**North American designation:** Class I Division 2

**IEC / ATEX designation:** Zone 2

**Basis or note:** Occasional hazard

> Occasional hazard | Class I Division 2 | Zone 2

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Class I Division 2 — North American vs IEC/ATEX explosion protection designations


**Category:** area classification

**North American designation:** Division 2

**IEC / ATEX designation:** Zone 2

**Basis or note:** Hazard present only under abnormal conditions

> Division 2 | Hazard present only under abnormal conditions

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Division 2 — North American vs IEC/ATEX explosion protection designations


**Category:** area classification

**North American designation:** Division 2

**IEC / ATEX designation:** Zone 2

**Basis or note:** Explosive atmosphere not likely; only abnormal conditions (<10 hrs/yr)

> Division 2 | Zone 2 | Explosive atmosphere not likely; only abnormal conditions (<10 hrs/yr)

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>


**Category:** area classification

**North American designation:** (no NEC equivalent)

**IEC / ATEX designation:** Zone 2

**Basis or note:** Explosive atmosphere unlikely in normal operation, only short duration eg. accidental leakage

> Zone 2 | Explosive atmosphere unlikely in normal operation, only short duration eg. accidental leakage

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** area classification

**North American designation:** Class II

**IEC / ATEX designation:** Zone 20, 21, 22 (dust)

**Basis or note:** Combustible dust

> Class II | Combustible dust

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>

Class II — North American vs IEC/ATEX explosion protection designations


**Category:** system attribute

**North American designation:** Class II Groups E, F, G

**IEC / ATEX designation:** Zone 20, 21, 22 (IIIA, IIIB, IIIC)

**Basis or note:** Dust classification

> Dust classification | Class II Groups E, F, G | Not covered | Zone 20, 21, 22 (IIIA, IIIB, IIIC)

Source: <https://exknowledge.com/pages/nec-500-vs-atex-iec.html>

Class II Groups E, F, G — North American vs IEC/ATEX explosion protection designations


**Category:** area classification

**North American designation:** (no NEC equivalent)

**IEC / ATEX designation:** Zone 20

**Basis or note:** Combustible dust present continuously

> Zone 20 | Combustible dust present continuously

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** area classification

**North American designation:** (no NEC equivalent)

**IEC / ATEX designation:** Zone 21

**Basis or note:** Dust likely during normal operation

> Zone 21 | Dust likely during normal operation

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>


**Category:** area classification

**North American designation:** (no NEC equivalent)

**IEC / ATEX designation:** Zone 22

**Basis or note:** Dust unlikely except briefly

> Zone 22 | Dust unlikely except briefly

Source: <https://www.inframena.com/hazardous-area-classification-equivalency-guide/>