The National Electrical Code (NEC) requirements for overvoltage protection can be found in Art. 242. This Article is new with the 2020 NEC, and it replaces Art. 280 and Art. 285. Those Articles ...

Hazardous locations are classified based on the properties of the combustibles in the location. A location isn’t necessarily a whole building; it can be a room or even an open area within a building.