
Summarizing, Division area classification designations for NEC Article 500 contain the
following information:
Class I, Division (1 or 2), Group (A, B, C, or D)
Class II, Division (1 or 2), Group (E, F, or G)
Class III, Division (1 or 2)
There are no Group designations for Class III locations. NEC Article 505 Zone Area
Classification Designations contains the following information:
Class I, Zone (0, 1, or 2), Group (IIC, IIB, or IIA)
NEC Article 506, for combustible dusts or ignitable fibers and flyings, zone area classification
designations are grouped as the following:
Zone 20, Zone 21, Zone 22
Area Classification Boundaries
Neither NFPA 70 Article 500.5 or ...