July 2012 NEC Article:Constructional Stretch & Hoist-Rope Tension

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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, 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:

• 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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