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AutoQuiz: Nonhazardous Pressurization Systems

AutoQuiz is edited by Joel Don, ISA's social media community manager.

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.

Joel Don
Joel Don
Joel Don is the community manager for ISA and is an independent content marketing, social media and public relations consultant. Prior to his work in marketing and PR, Joel served as an editor for regional newspapers and national magazines throughout the U.S. He earned a master's degree from the Medill School at Northwestern University with a focus on science, engineering and biomedical marketing communications, and a bachelor of science degree from UC San Diego.

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