ISA Interchange

Welcome to the official blog of the International Society of Automation (ISA).

This blog covers numerous topics on industrial automation such as operations & management, continuous & batch processing, connectivity, manufacturing & machine control, and Industry 4.0.

All Posts

AutoQuiz: What are Protection Techniques for Equipment?

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, AutoQuiz-protection-techniques-equipmentdevelopment/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 information about the CAP program. This question is from the CAP study guide, Performance Domain III, System Design. Definition: Design, specify, and procure the hardware/software used in the system.

Which of the following protection techniques is acceptable for equipment located in a Class I, Division 1 area?

a) explosion-proof apparatus and nonincendive equipment
b) explosion-proof apparatus and intrinsic safety
c) dust ignition-proof and nonincendive equipment
d) hermetically sealed and intrinsic safety
e) none of the above

 

Hazardous location protection techniques are defined by NEC 500.7 (NEC 2002 Code). The protection techniques are permitted as follows:

  • Explosion proof apparatus-Class I, Division 1 or 2
  • Intrinsic safety-Class I, Division 1 or 2; Class II, Division 1 or 2; or Class III, Division 1 or 2
  • Nonincendive equipment-Class I, Division 2; Class II, Division 2; or Class III, Division 1 or 2 (does not include Class 1, Division 1)
  • Dust ignition proof-Class II, Division 1 or 2 (does not include Class I, Division 1)
  • Hermetically sealed-Class I, Division 2; Class II, Division 2; Class III, Division 1 or 2 (does not include Class I, Division 1)

The best answer is B, explosion-proof apparatus and intrinsic safety.

 

Joel Don
Joel Don
Joel Don 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.

Related Posts

Benefits and Challenges Surrounding Industrial Internet of Things

As remote lifestyles continue to be the norm a year into the pandemic, the Internet of Things (IoT) remai...
Rebecca Jess Sep 24, 2021 5:30:00 AM

World’s Largest Manufacturers Lose $1 Trillion/Year to Machine Failure

Large industrial facilities lose more than a day’s worth of production each month and hundreds of million...
Steven Aliano Sep 21, 2021 5:30:00 AM

Monitor Your Raw Materials Usage with ERP Software

The careful management of raw materials is essential for manufacturers. Imprecision can easily result in ...
Emily Newton Sep 17, 2021 5:30:00 AM