Class 1 division 1 is a location in which?

Class 1 Division 1 is a classification used in the National Electrical Code (NEC) to designate locations where flammable gases, vapors, or liquids are present in sufficient quantities to create explosive or ignitable mixtures. These environments typically include areas such as refineries, chemical plants, and certain manufacturing facilities. In these locations, special precautions and equipment, such as explosion-proof enclosures, are required to ensure safety and prevent ignition sources.