Aluminum wiring was first used in residential construction in the mid-1960’s. It was initially considered as an acceptable substitute for copper, but subsequent concerns developed, indicating that the use of specially designed devices with the aluminum wiring and stringent attention to installation details were critical to minimize overheating hazards.

Considerations
Aluminum wiring creates a greater resistance to electric current flow than copper. Consequently, if undersized, overheating can occur. Corrosion that develops from the contact of two dissimilar metals (aluminum wire to steel connector on old devices) or the natural oxidation of bare aluminum wire can also cause overheating. In addition, aluminum has a greater thermal expansion/contraction rate and less resiliency to bending than copper. This creates problems at connection points. As the wire expands and contracts with each use, the wire distorts and loosens, leading to sparking or overheating. The HouseMaster Technical Staff recommends that all aluminum household systems be periodically checked by an electrician and currently recommended remedial action should be taken where appropriate.

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