Hazardous Location Enclosures
Hazardous location enclosures are specially crafted to protect electrical equipment in hazardous environments where flammable gases, vapors, or dust might be present. These enclosures are designed to prevent internal equipment from causing an external explosion or fire. A distinct characteristic of such enclosures is their ability to withstand an internal explosion, ensuring that any potential sparks or ignitions are contained within the enclosure, preventing them from reaching the external explosive environment.
Class I, Class II, and Class III are commonly used classifications, with Class I primarily pertaining to gases and vapors, Class II for dust, and Class III for fibers. Within these classes, various divisions and zones define the specific nature and likelihood of the hazardous materials being present either continuously or intermittently. For example, Class I Division 1 indicates a location where explosive gas-air mixtures are likely to occur during normal operations.
Hazardous location enclosures also encompass explosion-proof enclosures, which are designed to contain and extinguish any explosions that occur within their boundaries. The use of inert gas in some of these enclosures, known as purge systems, helps in maintaining a safe internal atmosphere by displacing the hazardous gases or vapors.
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