What type of materials does Class III location encompass?

Class III locations are defined in the National Electrical Code (NEC) as areas where there is a presence of combustible dusts and ignitable fibers. These materials pose a fire or explosion hazard when suspended in the air in sufficient quantities. In these environments, the risks arise from the potential for dust to accumulate and create explosive atmospheres, hence significant safety measures and specific types of electrical equipment are required to prevent ignition.

Understanding that Class III is specifically concerned with the risks associated with these airborne dust and fiber materials highlights the need for special equipment ratings and installation practices to mitigate the dangers. The recognition of the types of hazards present in these locations is crucial for electricians and supervisors to ensure the safety and compliance of electrical systems in such environments.