Division 1:

Where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or some of the time under normal operation conditions.

Zone 0:

Where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or for long periods of time under normal operating conditions.

Zone 1:

Where ignitable concentrations of flammable gases, vapors or liquids can exist some of the time under normal operating conditions.

Division 2:

Where ignitable concentrations of flammable gases, vapors or liquids are not likely to exist under normal operating conditions.

Zone 2:

Where ignitable concentrations of flammable gases, vapors or liquids are not likely to exist under normal operating conditions.

Division 1 and 2

Zone 0, 1 and 2

A: Acetylene

B: Hydrogen
Acrolein
Arsine
Butadiene
Ethylene Oxide
Propylene oxide
Propylnitrate

C: Ethylene
Ethylenmine
Ethyl mercaptan
Ethyl sulfide
Hydrogen cyanide
Hydrogen sulfide
Morpholine
2-Nitropropane
Tetrahydrofuran
Unsymmetrical dimethylhydrazine

D: Propane
Acetic acid (glacial)
Acetone
Acrylonitrile
Ammonia
Benzene
Butane

1- Butanol (butyl alcohol)
2- butanol (secondary butyl alcohol)
n- butyl acetate
Isobutyl acetate
Sec.- butyl alcohol
Di-isobutylene
Ethane
Ethanol (ethyl alcohol)
Ethyl acetate
Ethylene diamine (anyhydrous)
Ethylene dichloride
Gasoline (56-60 octane)
Hexanes
Heptanes
Isoprene
Isopropyl ether
Mesityl oxide
Methane (natural gas)
Methanol (methyl alcohol)
3-methyl-1 butanol (isoamyl alcohol)
Methyl ethyl ketone
Methyl isobutol keytone
2-methyl-1 proponal (isobutyl alcohol)
2-methyl-2 proponal (tertiary butyl)
Petroleum naptha
Pyridine
Octanes
Pentanes
1-pentanol (amyl alcohol)
1-propanol (propyl alcohol)
2-propanol (isoproyl alcohol)
Propylene
Styrene
Toluene
Vinyl acetate
Vinyl chloride
Zylenes (o-xylene)

IIC: Acetylene

      Hydrogen

IIB: Ethylene
Ethyl Either
Butadiene

IIA: Propane
Cyclopropane
Ethane
Butane
Benzene
Pentane
Heptane
Acetone
Methyl Alcohol
Ethyl Alcohol

I:    Methane (Gaseous Mines)

Division 1 and 2

Zone 0, 1 and 2

T1 (<450°C)

T1 (<450°C)

T2 (<300°C)

T2 (<300°C)

T2A, T2B, T2C, T2D (<280°C, <260°C, <230°C, <215°C)

T3 (<200°C)

T3 (<200°C)

T3A, T3B, T3C (<180°C, <165°C, <160°C)

T4 (<135°C)

T4 (<135°C)

T4A (<120°C)

T5 (<100°C)

T5 (<100°C)

T6(<85°C)

T6 (<85°C)

Applicable Certification Documents

Area

Protection Methods

U.S.

Canada

Div. 1

• Explosion Proof UL 1203 CSA-30

UL 1203

CSA-30

• Intrinsically safe (2 fault)

UL 913

CSA-157

• Purged/pressurized (Type X or Y)

NFPA 496

NFPA 496

Div. 2

• Nonincendive

UL 1604

CSA-213

• Non-sparking device

UL 1604

CSA-213

• Purged/pressurized (Type Z)

NFPA 496

NFPA 496

• Hermetically sealed

UL 1604

CSA-213

• Any Class I, Div. 1 method

----

----

• Any Class I, Zone 1 or 2 method

----

----

Applicable Certification Documents

Area

Protection Methods

U.S.

Canada

IEC

Europe

Zone 0

• Intrinsically safe, 'ia' (2 fault)

UL 2279, Pt. 11

CSA-E79-11

IEC 60079-11

EN 50020

• Class I, Div. 1 intrinsically safe (2 fault )method

UL 913

CSA-157

----

----

Zone 1

• Encapsulation, 'm'

UL 2279, Pt. 18

CSA-E79-18

IEC 60079-18

EN 50028

• Flameproof, 'd'

UL 2279, Pt. 1

CSA-E79-1

EIC 60079-1

EN 50018

• Increased safety, 'e'

UL 2279, Pt. 7

CSA-E79-7

IEC 60079-7

EN 50019

• Intrinsically safe, 'ib' (1 fault)

UL 2279, Pt. 11

CSA-E79-11

IEC 60079-11

EN 50020

• Oil immersion, 'o'

UL 2279, Pt. 6

CSA-E79-6

IEC 60079-6

EN 50015

• Powder filling, 'q'

UL 2279, Pt. 5

CSA-E79-5

IEC 60079-5

EN 50017

• Purged/pressurized, 'p'

----

CSA-E79-2

IEC 60079-2

EN 50016

• Any Class I Zone 0 method

----

----

----

----

• Any Class I, Div. 1 method

----

----

----

----

Zone 2

• Nonincendive, 'nC'

UL 2279, Pt. 15

CSA-E79-15

IEC 60079-15 pr

EN 50021

• Non-sparking device, 'nA'

UL 2279, Pt. 15

CSA-E79-15

IEC 60079-15pr

EN 50021

• Restricted breathing, 'nR'

UL 2279, Pt. 15

CSA-E79-15

IEC 60079-15 pr

EN 50021

• Hermetically sealed, 'nC'

UL 2279, Pt. 15

CSA-E79-15

IEC 60079-15 pr

EN 50021

• Any Class I, Zone 0 or 1 method

----

----

----

----

• Any Class I, Div. 1 or 2 method

----

----

----

----

Applicable Certification Documents

Area

Protection Methods

U.S.

Canada

Div. 1

• Dust-ignition proof

UL 1203

CSA-25 or CSA-E-1241-1-1

• Intrinsically safe

UL 913

CSA-157

• Pressurized

NFPA 496

NFPA 496

Div. 2

• Dust Tight

UL 1604

CSA-157 or CSA-E-1241-1-1

• Nonincendive

UL 1604

----

• Non-sparking

UL 1604

----

• Pressurized

NFPA 496

NFPA 496

• Any Class II, Div. 1 method

----

----

Class I, II & III, Division 1 & 2 (U.S. & Canada) ---- This marking would include:

Class(es), Division(s), Gas/Dust Group(s), Temperature Code

Example: Class I, Division 1, Group C & D, T4A

Class I, Zone 0, 1 & 2 (U.S. & Canada) ---- This marking would include

Method A: For Zone Listings based on UL 2279 or the CSA-E79 Series

Class, Zone(s), Ex, Protection Method(s), Gas Group, Temperature Code

Example: Class I, Zone 1, Ex de IIB T4

Method B: For Zone Listings based on UL or CSA Division Certification Documents

Class, Zone(s), Gas Group, Temperature Code

Example: Class I, Zone 1, Group IIB, T4

Note: For U.S. Zone Listings based on UL 2279, Article 505 of the 1999 NEC requires that the "Ex" element of the marking string shall read "Aex."

Note: For Canadian Zone Listings based on the CSA-E79 Series, The "Class" and "Zone" elements of the marking string are optional.

Zone 0, 1 & 2 (IEC only ) ---- This marking would include:

Ex, Protection Method(s), Gas Group, Temperature Code

Example: Ex de IIB T4

Zone 0, 1 & 2 (Europe only) ---- This marking would include:

EEX, Protection Method(s), Gas Group, Temperature Code

Example: EEX de IIB T4

Division 1:

Where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or some of the time under normal operation conditions.

< >

Zone 0:

Where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or for long periods of time under normal operating conditions.

[Only achievable by Intrinsically safe, 'ia' (2 fault)]

Division 1:

Where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or some of the time under normal operation conditions.

< >

Zone 1:

Where ignitable concentrations of flammable gases, vapors or liquids can exist some of the time under normal operating conditions.

Division 2:

Where ignitable concentrations of flammable gases, vapors or liquids are not likely to exist under normal operating conditions.

< >

Zone 2:

Where ignitable concentrations of flammable gases, vapors or liquids are not likely to exist under normal operating conditions.