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Today's automation industry quiz question comes from the ISA Certified Automation Professional certification program. ISA CAP certification provides a non-biased, third-party, objective assessment and confirmation of an automation professional's skills. The CAP exam is focused on direction, definition, design, development/application, deployment, documentation, and support of systems, software, and equipment used in control systems, manufacturing information systems, systems integration, and operational consulting. Click this link for more information about the CAP program.
What ISA RP12.4 (NFPA 496) defined type of pressurization system will reduce the classification within an enclosure from Division 1 to nonhazardous?
a) Type W
b) Type X
c) Type Y
d) Type Z
e) none of the above
A Type X pressurization system reduces the classification within the enclosure from Division 1 to nonhazardous and, therefore, permits the use of ignition-capable equipment inside the enclosure. A Type Y pressurization system reduces the classification within an enclosure from Division 1 to Division 2. A Type Z pressurization system reduces the classification within an enclosure from Division 2 to nonhazardous.
The correct answer is B, Type X.
Reference: Ernest Magison; Electrical Instruments in Hazardous Locations, 4th Edition; ISA Press.