Explosion-proof lighting is designed to be used in environments with potentially explosive atmospheres where flammable gases, vapors, liquids, or combustible dusts may be present. These environments are classified into different zones or divisions based on the frequency and duration of the presence of these hazardous materials. Here are the common types of explosive atmospheres where explosion-proof lighting is utilized:

Gas Atmospheres:

Zone 0: In this zone, explosive gases or vapors are present continuously or for long periods. Explosion-proof lighting fixtures designed for Zone 0 must be able to contain any potential ignition source.

Zone 1: In this zone, explosive gases or vapors are likely to occur during normal operations. Explosion-proof lighting fixtures for Zone 1 are designed to prevent the entry of explosive gases and protect against external ignition sources.

Dust Atmospheres:

Zone 20: In this zone, combustible dust is present continuously or for long periods. Explosion-proof lighting fixtures for Zone 20 must be able to contain any potential ignition source and prevent the spread of flames.

Zone 21: In this zone, combustible dust is likely to occur during normal operations. Explosion-proof lighting fixtures for Zone 21 are designed to prevent the entry of combustible dust and protect against external ignition sources.

Mixture of Gases and Dusts:

Zone 22: In this zone, a mixture of combustible dust and air may occur during normal operations. Explosion-proof lighting fixtures for Zone 22 are designed to prevent the entry of combustible dust and protect against external ignition sources.

Class I, II, and III Divisions:

Class I Division 1 (Div. 1): In locations where ignitable concentrations of flammable gases, vapors, or liquids are present continuously, intermittently, or periodically under normal operating conditions.

Class I Division 2 (Div. 2): In locations where ignitable concentrations of flammable gases, vapors, or liquids are present only during abnormal conditions, such as a container failure or system breakdown.

Class II Division 1 (Div. 1): In locations where combustible dust is present continuously, intermittently, or periodically under normal operating conditions.

Class II Division 2 (Div. 2): In locations where combustible dust is present only during abnormal conditions.

The specific classification may vary depending on regional standards and regulations. Explosion-proof lighting fixtures are designed and certified to meet the requirements of these different zones and divisions, providing a safe lighting solution in hazardous environments where the risk of explosions is a concern.