Final answer:
The codes divide hazardous occupancies into fire, explosive, health, and reactivity hazards, with the key electrical hazards being thermal and shock, which safety systems aim to prevent.
Step-by-step explanation:
The codes divide the type of hazardous occupancies into four main categories: fire, explosive, health, and reactivity hazards. These categories are utilized in the National Fire Protection Agency (NFPA) 704 Hazard Identification System to provide safety information about chemicals and substances. This system, often displayed as a diamond-shaped symbol, indicates the level of hazard associated with a chemical substance, in terms of its flammability, reactivity, health risks, and other special hazards.
Two known hazards of electricity are thermal (excessive power) and shock (current through a person). Electrical safety systems and devices are employed to prevent these hazards, minimizing the risk of fire or injury due to electrical currents.