Class I hazardous locations are made hazardous by the presence of which factor?

Class I hazardous locations are defined by the presence of flammable liquids. These locations are typically associated with areas where volatile flammable liquids or gases may be present under normal operating conditions, creating a risk of fire or explosion. The classification is crucial for ensuring the safety and integrity of electrical installations in such environments, which could include places like refineries or chemical plants where these materials are stored or processed.

The focus on flammable liquids means that the equipment and installations in Class I locations must be designed to prevent ignition and withstand potential explosive atmospheres. Understanding this classification helps electrical contractors implement appropriate safety measures and comply with regulations to mitigate the risks associated with fire hazards in these environments.