Hazardous Area Classification Charts
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| NORTH AMERICAN HAZARD CLASSES | |||
| Example | NEC 500-503 | NEC 505 | |
| CLASS I
Gases and Vapors |
Acetylene
Hydrogen Ethylene Propane |
Group A
Group B Group C Group D |
IIC
IIC or IIB+H2 IIB IIA |
| CLASS II
Dusts |
Metal Dust
Coal Dust Grain Dust |
Group E
Group F Group G |
|
| CLASS III
Fibers & Flyings |
Wood, Paper or Cotton Processing | No sub-groups | |
| CLASSIFICATION OF DIVISIONS AND ZONES | |||
| Example | NEC 500-503 | NEC 505 | |
| CLASS I
Gases and Vapors |
Acetylene
Hydrogen Ethylene Propane |
Group A
Group B Group C Group D |
IIC
IIC or IIB+H2 IIB IIA |
| CLASS II
Dusts |
Metal Dust
Coal Dust Grain Dust |
Group E
Group F Group G |
|
| CLASS III
Fibers & Flyings |
Wood, Paper or Cotton Processing | No sub-groups | |
Zones and Divisions and safety categories: a measure of the likelihood of the hazard being present. This defines the method of protection which may be used. NEC - National Electrical Code is a registered trademark, National Fire Protection Association NEC 505 covers explosive gases and vapors only * according EU directive 94/9 EU (ATEX) |
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| CLASSIFICATION OF GROUPS | |||
| Typical Gas Hazard | North America NEC Article 500 (Class I) |
North America NEC Article 500 (Class II) |
CENELEC EN 50 014 IEC |
| Acetylene | A | IIC
|
|
| Hydrogen | B | IIC or IIB+H2 | |
| Ethylene | C | IIB | |
| Propane | D | IIA | |
| Metal Dust | E | ||
| Corall Dust | F | ||
| Grain Dust | G | ||
Gas classification and ignition temperatures relate to mixtures of gas and air at ambient temperature and atmospheric pressure. |
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| TEMPERATURE CLASSIFICATION | |||
| Max. Surface Temp. (°C) |
NEC Table500-3(d) |
IEC79-8 T Class |
EN 50 014 |
| 450°C | T1 | T1 | T1 |
| 300°C | T2 | T2 | T2 |
| 280°C | T2A | -- | -- |
| 260°C | T2B | -- | -- |
| 230°C | T2C | -- | -- |
| 215°C | T2D | -- | -- |
| 200°C | T3 | T3 | T3 |
| 180°C | T3A | -- | -- |
| 165°C | T3B | -- | -- |
| 160°C | T3C | -- | -- |
| 135°C | T4 | T4 | T4 |
| 120°C | T4A | -- | -- |
| 100°C | T5 | T5 | T5 |
| 85°C | T6 | T6 | T6 |
A full list of gases and temperature classifications is published in the Crouse-Hinds Code Digest. |
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Miretti Americas is a
global leader in Explosion
Proof Solutions, combining Excalibur's expertise in the Americas Explosion Proof Market and Miretti's extensive
knowledge of the
European and Asian Markets. Worldwide distribution of our product line includes: Electric
and Diesel Explosion Proof equipment, customized
Explosion Proof solutions
and integrations.
global leader in Explosion
Proof Solutions, combining Excalibur's expertise in the Americas Explosion Proof Market and Miretti's extensive
knowledge of the
European and Asian Markets. Worldwide distribution of our product line includes: Electric
and Diesel Explosion Proof equipment, customized
Explosion Proof solutions
and integrations.
