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IAEI Magazine | Author: Paul Babiarz
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Paul Babiarz

Paul Babiarz is manager of business development for Cooper Crouse-Hinds, a leading manufacturer of electrical products for hazardous locations. He has a B.S. from the University of Rochester; a M.S. from University of Michigan; and a MBA from Syracuse University. Paul has over twenty years of experience in hazardous areas and has published over 35 technical publications on the subject. He is a senior member of IEEE and serves on the executive subcommittee of the Petroleum and Chemical Industry Committee as chair of the International Subcommittee.


Comparison of Division and Zone Systems

There are two significant changes that electrical inspectors must be cognizant of with the new zone classification system. First, all zone-rated equipment can be used in Division 2, which is 90 percent of classified areas. Second, zone-rated products will have different markings and labels. Before getting into the details of these requirements, it may be useful to examine the background of these Code changes. This paper will briefly describe the explosion-protective techniques and sort out the differences for electrical inspectors in equipment and installations.

Intrinsic Safety

Intrinsic safety is the method of protection for control and instrumentation circuits where the nominal voltage is 24 VDC or less and the current is normally less than 100 mA. The concept of intrinsic safety is to limit the voltage and current so that there is never a spark with enough energy to create an explosion. Intrinsic safety when properly used removes the ignition from the explosion triangle.