What type of hazard does Hazard Class 2 Division 2 material present?
There are two unrelated hazard classification systems that have
categories called "Class 2 Division 2" One is the NFPA system for
designating explosive environments. The other is the DOT system for
classifying materials that are hazardous in transportation.
In the NFPA system for explosive environments, Class 2 locations
are hazardous because of the presence of combustible (explosive)
dust.
Class 2, Division 2 locations are places in which combustible
dusts will not normally be in suspension in the air, or will not be
likely to be thrown into suspension by the normal operation of
equipment or apparatus, in quantities sufficient to produce
explosive or ignitable mixtures, but where accumulations of dust
may be sufficient to interfere with the safe dissipation of heat
from electrical equipment or apparatus, or where accumulations of
dust on, in, or in the vicinity of electrical equipment might be
ignited by arcs, sparks, or burning material from such
equipment
In the DOT system for hazardous materials in transportation,
Class 2 is for compressed and poisonous gases. Class 2, Division 2
(also called Division 2.2 ) is for non-flammable compressed
gases.