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CLASS I
Flammable Gases, Vapors or Liquids |
CLASS II
Combustible Dusts |
CLASS I AREA CLASSIFICATION |
CLASS II AREA CLASSIFICATION |
Division 1:
Where ignitable concentrations of flammable gases, vapors or liquids can exist all of the time or some of the time under normal operating conditions. |
Zone 0:
Where ignitable concentrations of flammable gases, vapors or liquids are present continuously or for long periods of time under normal operating conditions.
Zone 1:
Where ignitable concentrations of flammable gases, vapors or liquids are likely to exist under normal operating conditions. |
Division 1:
Where ignitable concentrations of combustible dusts can exist all of the time or some of the item 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 2:
Where ignitable concentrations of combustible dusts are not likely to exist under normal operating conditions. |
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CLASS I GROUPS |
CLASS II GROUPS |
Division 1 and 2 |
Zone 0, 1 and 2 |
Division 1 and 2 |
A (acetylene) |
IIC (acetylene & hydrogen) |
E (metals - Div. 1 only) |
B (hydrogen) |
IIB (ethylene) |
F (coal) |
C (ethylene) |
IIA (propane) |
G (grain) |
D (propane) |
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CLASS I TEMPERATURE CODES |
CLASS II TEMPERATURE CODES |
Division 1 and 2 |
Zone 0, 1 & 2 |
Division 1 and 2 |
T1 (≤450°C) |
T1 (≤450°C) |
T1 (≤450°C) |
T2 (≤300°C) |
T2 (≤300°C) |
T2 (≤300°C) |
T2A, T2B, T2C, T2D
(≤280°C, ≤286°C, ≤230°C, ≤215°C) |
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T2A, T2B, T2C, T2D
(≤280°C, ≤286°C, ≤230°C, ≤215°C) |
T3 (≤200°C) |
T3 (≤200°C) |
T3 (≤200°C) |
T3A, T3B, T3C (≤180°C, ≤165°C, ≤160°C) |
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T3A, T3B, T3C (≤180°C, ≤165°C, ≤160°C) |
T4 (≤135°C) |
T4 (≤135°C) |
T4 (≤135°C) |
T4A (≤120°C) |
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T4A (≤120°C) |
T5 (≤100°C) |
T5 (≤100°C) |
T5 (≤100°C) |
T6 (≤85°C) |
T6 (≤85°C) |
T6 (≤85°C) |
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CLASS I, DIVISION 1 AND 2 PROTECTION METHODS |
CLASS II, DIVISION 1 AND 2 PROTECTION METHODS |
Application Certification Documents |
Application Certification Documents |
| Area / Protection Methods |
USA |
Canada |
Area / Protection Methods |
USA |
Canada |
Div.1
Explosion proof
Intrinsically safe (2 Fault)
Purged/pressurized (Type X or Y) |
ANSI/UL 1203
ANSI/UL 913
ANSI/NFPA 496 |
CSA-30
CSA-157
ANSI/NFPA 496
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Div.1
Dust-ignition proof
Intrinsic safe
Pressurized
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ANSI/UL 1203
ANSI/UL 913
ANSI/NFPA 496 |
CSA-25 or CSA-E61241-1-1
CSA-157
ANSI/NFPA 496
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Div. 2
Hermetically sealed
Nonincendive
Non-sparking
Purged/pressurized (Type Z)
Any Class 1, Div. 1 method
Any Class 1, Zone 0, 1 or 2 method |
UL 1604
UL 1604
UL 1604
ANSI/NFPA 496
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UL 60079 series
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CSA-213
CSA-213
CSA-213
ANSI/NFPA 496
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CSA E60079 series |
Div. 2
Dust tight
Hermetically sealed
Nonincendive
Pressurized
Any Class II, Div. 1 method |
UL 1604
UL 1604
UL 1604
NFPA 496
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CSA-157 or CSA-E61241-1-1
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NFPA 496
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