Class III locations are those which are hazardous because of the presence of easily ignitable fibers or flyings. The rest of this paper will concentrate mainly on the Class I locations. Please refer to Appendix A, Figure 6 and Figure 7, for information on Class II and Class III.
Is Class I Div 2 explosion proof?
Class I locations consist of areas where gases, vapors or liquids may exist that have the potential to become flammable or ignitable. Zone 2 is described as there not being a likelihood of explosive or flammable gases, vapors or liquids present during normal operating conditions.
What makes an area hazardous because of combustible dust?
Locations that are hazardous because of the presence of combustible dust. Note that the dust must be present in sufficient quantities for a fire or explosion hazard to exist. The fact that there is some combustible dust present does not mean a Class II hazardous location exists.
Can a Class 1 hazardous location be used in a Division 2 hazardous location?
If equipment has been approved for use in a Division 1 hazardous location, it can be used in a Division 2 hazardous location, providing it is in the same class and group. Q: Can equipment approved for a Class I hazardous location be used in a Class II hazardous location?
How are the locations of Class II Dust determined?
Class II locations are divided into three groups E,F,G. Class II location groups are determined by: the ignition temperature of the dust, the electrical conductivity of the dust, and the thermal blanketing effect the dust can have on heat-producing equipment such as lighting fixtures and motors.
How are Class 2 combustible metal dusts classified?
Class II combustible dusts are grouped into one of three (3) groups: E combustible metal dusts, F combustible carbonaceous dusts or G other combustible dusts. The Zone Classification System is offered as an alternative to the Class and Division system.
