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→Meanings of Letters and Numbers
'''2''': There are three area category types, with Category 1 requiring a very high level of protection and defined as an area having a permanent or prolonged risk of explosions (Zone 0), Category 2 which requires a high level of protection and has a frequent risk of an explosive mix being present in the air (Zone 1), and Category 3, specified as requiring a normal level of protection with a small chance of an explosive mix forming (Zone 2).
'''2''': There are three area category types, with Category 1 requiring a very high level of protection and defined as an area having a permanent or prolonged risk of explosions (Zone 0), Category 2 which requires a high level of protection and has a frequent risk of an explosive mix being present in the air (Zone 1), and Category 3, specified as requiring a normal level of protection with a small chance of an explosive mix forming (Zone 2).
[[File:ATEX ZONES EXAMPLE 08.png|thumb|right|Zones example]]
'''G''': This specifies the type of explosive atmosphere. D for dust and G for gases.
'''G''': This specifies the type of explosive atmosphere. D for dust and G for gases.