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Chapter 3: Whose Turn is it? Phasing, Rings, and Barriers
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This activity will give you the opportunity to learn how movements and phases are safely sequenced.
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Describe NEMA phasing and the concept of rings and barriers
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List the NEMA ring operational rules
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Define the terms and variables in the Glossary
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Prepare a document that includes answers to the Critical Thinking Questions
Provide a definition for each of the following terms and variables. Paraphrasing a formal definition (as
provided by your text, instructor, or another resource) demonstrates that you understand the meaning of
the term or phrase.
concurrency
group
movement
NEMA phase
numbering
overlap
phase
ring
ring barrier
diagram
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Phasing, Rings, and Barriers