2018 October A17/B44 Type B Safety Stopping, Part Two
SPECIAL NOTICE: Please check each course for verification of approval before purchasing. This test is based on the article, A17/B44 Type B Safety Stopping, Part Two, published in the October 2018 issue and counts as 2 Contact Hours (0.2 CEU) towards recertification. Most courses are approved by NAEC for CET/CAT and NAESAI for QEI and in the following states: Alabama, Arkansas, Florida, Georgia, Illinois, Indiana, Kentucky, Maryland, .Mississippi, Missouri, Montana, Oklahoma, Pennsylvania, Vermont, Virginia, Washington, West Virginia, Wisconsin. Learning Objectives: - After reading this article, you should:
- A basic understanding of the performance of Type B safeties in the free-fall mode, stopping the car by the safeties, on their own
- A basic understanding why the A17 committees were asked by the European code writers three decades ago to reexamine the need for safeties, designed and manufactured in the U.S., to be tested in the free-fall condition and certified by independent entities
- A basic understanding of the arguments for and against free-fall protection for Type B safeties three decades ago
- A basic understanding why the A17 committees concluded that free-fall protection of Type B safeties designed and manufactured in North America was no longer necessary, since the frequency of total suspension loss on a traction elevator was so low as to be almost negligible
- A basic understanding of the arguments for and against free-fall protection for Type B safeties as viewed in contemporary times
- A basic understanding why the A17 committees never codified free-fall type testing and certification of Type B safeties in the A17/B44 code
- A basic understanding of the operational steps of the mechanical systems, which cause time response delays in governor and safety application
- A basic understanding of the incremental speed increases during the governor and safety-activation process due to time response delays
- A basic understanding of the operational characteristics of a pit oil buffer in assisting in the retardation and stopping of a free-falling car, the safeties of which have slowed the car speed to that which can be safely withstood by the buffer
- A basic understanding of free-fall performance of Type B safeties in the free-fall mode, coupled with an oil buffer stop
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