July 2012 NEC Article:Constructional Stretch & Hoist-Rope Tension
SPECIAL NOTICE: Please check each course for verification of approval before purchasing.
This test is based on the article, Constructional Stretch and Hoist-Rope Tension, published in the July 2012 issue and counts as one contact hour (0.1 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, 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 have learned about:
- Why equalizing hoist-rope tensions is so difficult
- Why most rope-tension measurement devices are of little practical use
- The concept of the term "constructional stretch"
- The basic factors affecting constructional stretch in a hoist rope
- The principle behind all load-measurement devices
- The sources of error behind most load-measurement devices
- Why a load-measurement device is different from one that actually equalizes rope loads
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