Hazardous area classifications are systems used to identify and categorize locations where flammable gases, vapors, or dusts may be present. These classifications help ensure safety by determining the appropriate equipment and safety measures needed to prevent explosions or fires. Areas are typically classified into zones based on the likelihood and duration of hazardous material presence. The main classifications include Zone 0, Zone 1, and Zone 2 for gas environments, and Zone 20, Zone 21, and Zone 22 for dust environments. Each zone has specific requirements for electrical equipment and installation practices to minimize risks associated with potential ignition sources.