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ALUMINUM WIRING HAZARDS & REPAIRS
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This article explains the reasons for and effects of inadequate contact between aluminum conductor wires inside of a twist-on connector.
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Color photos and descriptive captions from CPSC Meeting 9/28/95. In this document aluminum wire twist-on connector failures and repair procedures are described, including aluminum wire repair methods which work and methods which do not work and are unsafe. This document series describes hazards with existing aluminum wiring repair products, explains the aluminum wiring failure mechanism, and reviews recommended retrofit procedures including use of readily-available materials.
This information was presented to the US Consumer Product Safety Commission by Dr. J. Aronstein, 9/28/95. The minutes of that meeting were obtained under the Freedom of Information Act and posted by Daniel Friedman January 1996.
Click any image to see an enlarged version.
17. The characteristic heating in a band around the connector shows us where the heat is being generated. In all of those failures shown, from both lab and homes, the heat is generated by current
flowing in the connector spring. Here, all of the current is passing from wire-to-wire through sections of the steel spring.
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