2018 April A17/B44 Type B Safety Stopping, Part One
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 One, published in the April 2018 issue and counts as two contact hours (0.2 CEU) of elevator industry continuing education credit. Most courses are approved by NAEC for CET/CAT and NAESAI for QEI and in the following states: Alabama, Arkansas, Colorado, Florida, Georgia, Illinois, Indiana, Kentucky, Maryland, Mississippi, Missouri, Oklahoma, Pennsylvania, Vermont, Virginia, Washington, West Virginia, Wisconsin.
Learning Objectives - After reading this article, you should have learned about:
- Have developed a basic understanding of the characteristics of Type B safeties
- Have developed a basic understanding of the combination safety and machine braking in stopping the elevator
- Have developed a basic understanding that, in most cases, the braking system takes longer to activate than the safety stopping time duration
- Have developed a basic understanding of the effects of and methodology behind potential "minimum assistance"
- Have developed a basic understanding of the incremental speed increases during the governor and safety application
- Have developed a basic understanding that the available traction, or tractive effort, between the drive sheave grooves and suspension means affects the retardation of the Type B safety
- Have developed a basic understanding of the general theory and practice, design and A17/B44 Safety Code for Elevators and Escalators compliance of Type B flexible guide clamp safety stopping
- Have developed a basic understanding of the methods of field testing Type B flexible guide clamp safeties with the driving machine stopped, and with the driving machine running
- Have developed a basic understanding of the operational steps of the mechanical and electromechanical systems, which cause time response delays in governor and safety application
- Have developed a basic understanding that, in the rare case when the braking system applies while the car is still being retarded by the safeties, the brake will only provide minor assistance in stopping the car, because most of the retardation is provided by the safeties
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