Which organization classifies fire into four groups?

The National Fire Protection Association (NFPA) is the organization responsible for classifying fire into four groups, known as fire classifications. These classifications categorize fires based on the type of fuel involved, which helps in determining the appropriate firefighting techniques and extinguishing agents to use. The four groups are Class A (ordinary combustibles like wood, paper, and cloth), Class B (flammable liquids), Class C (electric fires), and Class D (combustible metals). This classification system is crucial for safety training and emergency response planning, enabling firefighters and safety professionals to effectively address different types of fire incidents.

While organizations like OSHA (Occupational Safety and Health Administration) establish workplace safety standards, and the NEC (National Electrical Code) defines electrical safety codes, they do not classify fires into these groups. Similarly, ISO (International Organization for Standardization) deals with various international standards but is not focused specifically on fire classifications. Thus, the NFPA is recognized as the authoritative body on this matter, making it the correct answer.