Which class charges facilities where combustible dust may be present?

Facilities where combustible dust may be present fall under Class II according to the National Electrical Code (NEC) standards. This classification specifically addresses areas in which combustible dust could create an explosion hazard. Class II includes environments that contain combustible dust from various materials, such as metals, wood, plastics, and organic materials, which, when suspended in the air, could ignite and cause significant safety issues.

The NEC outlines specific requirements for equipment, installation practices, and maintenance in these environments to minimize risk and ensure safety. A thorough understanding of the characteristics of combustible dust and the environments that could enable dust accumulation is crucial in addressing potential hazards and ensuring compliance with regulations regarding electrical safety in such facilities.

While other classes deal with different types of hazards such as flammable gases, vapors, or fibers, they do not encompass the specific risks associated with combustible dust, which is why Class II is the appropriate answer for facilities where such dust may be present.