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NEC Chapter 5 addresses occupancies that require special considerations, including requirements for hazardous (classified) areas, special or unusual hazards and unusual aspects of ordinary wiring systems.
In the NEC classification system, Classes I, II and III are assigned to areas based on the presence of various types of hazardous material. Division and Zone designations for areas are based on the likelihood that classified material is present in an ignitable form.
The NEC classification system in Chapter 5 includes specific requirements for certain common applications, including commercial garages, aircraft hangars, motor fuel dispensing facilities, bulk storage plants and spray application, dipping and coating processes.
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