Electrician's Licensing Practice Exam

Which of the following is a recognized hazard in a Class III hazardous environment?

1. Flammable gases

2. Air-borne particulate

3. Electrical shock

4. Extreme temperatures

The correct answer is: Air-borne particulate

A Class III hazardous environment is primarily defined by the presence of combustible dust rather than flammable gases or liquids. In this type of environment, the primary risk is from air-borne particulates that can potentially ignite and cause explosions when dispersed in the air. Therefore, the mention of airborne particulates aligns directly with the hazards specifically associated with Class III locations, where materials like wood flour, plastic dust, or chemicals that can form explosive dust clouds are common. Flammable gases are typically associated with Class I environments, where flammable vapors are present. Electrical shock is a concern in all electrical environments but is not unique to hazardous locations defined by particulate. Extreme temperatures can occur in various settings but do not specifically denote the hazards of a Class III environment. Thus, the correct focus on air-borne particulate highlights the nature of the hazards prevalent in Class III hazardous environments, making it the appropriate answer to the question posed.