What classification pertains to locations where combustible dusts are handled but are not likely to be in suspension?

The classification that pertains to locations where combustible dusts are handled but are not likely to be in suspension is Class 2. Class 2 locations specifically deal with the presence of combustible dusts, identifying environments where such dust may be present, but where operational conditions typically prevent the dust from suspending in the air under normal circumstances.

This classification acknowledges the risks inherent in handling combustible dust, which can ignite or explode when airborne in sufficient concentrations and mixed with an ignition source. Furthermore, Class 2 locations are divided into different divisions to further specify the levels of risk and dust concentrations.

The classification system addresses various hazardous locations: Class 1 relates to flammable gases and vapors, while Class 3 generally pertains to locations with easily ignitable fibers or flyings, but not necessarily dust. Class 4 is not part of the standard classification system used for hazardous locations; thus, it is not applicable in this context.