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No corrective actions are required for copper-clad aluminum wire. There is no known history of connection overheating problems associated with copper-clad aluminum wire. Markings on the cable jacket would include "Al" or "Aluminum".

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12-14 AWG) and on the cut end, the copper skin looks to be "smeared" over the aluminum core. Therefore when installed and where visible in the main electrical service panel, it looks like "fat" copper wire (i.e., 10-12 AWG v. 12-10 AWG) has a thin copper outer skin and a core of aluminum.

There Aronstein statesĬopper-clad aluminum wire (Nos. Copper-clad aluminum electrical wire is described in REDUCE THE AL WIRE RISK: DETAILS, as well as in Aronstein (2011). Is copper-clad aluminum wire safe to leave in place? I would not assume that copper-clad AL wire might not appear in an older home in which electrical wiring was added or changed during that same interval, and it's also possible, though less likely, that copper clad aluminum wire might appear in new home built after 1975 if an electrician had and wished to use up old copper-clad aluminum wire stock. switches, receptacles (binding head screw, back-wired, and pressure plate type terminals) and was treated as "aluminum" conductor for use in AL-CU pressure wire connectors in response to field failures of solid aluminum conductor branch circuit wiring. 12-10 AWG), was designed by Texas Instruments for use with standard copper-only wiring devices, ie. Approximately 10 percent of the cross-sectional area of the conductor is copper clad, thickness is not specified. Some details about copper-clad aluminum wiring are provided by Tom D'Agostino:Ĭopper clad aluminum electrical wire is comprised of a solid aluminum core covered with a thin clad of copper. In fact a small amount of the copper cladding was smeared across the cut wire-end by the wire-cutting process as you might notice at the lower edge of the cut edge above the "COR" in the word "CORE". The image shows the thickness of the copper cladding (yellow arrow) as well as cut marks across the end of the wire's aluminum conductor (white arrow). This product was installed in homes in the United States between 19.Ībove you can see a close-up of a typical end-cut of a #10 copper clad aluminum wire.

COPPER CLAD ALUMINUM ELECTRICAL WIRE RESEARCHĬopper-clad aluminum wire is made of a solid aluminum core covered with a copper skin in order to improve its performance in the field.

COPPER-CLAD ALUMINUM vs TINNED COPPER vs CU/AL or COALR.

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HOW to IDENTIFY COPPER-CLAD ALUMINUM WIRE.

DEFINITION of COPPER-CLAD ALUMINUM WIRE.

The photograph of copper-clad aluminum wiring shown above illustrates this product installed in a installed in a Minnesota home: photo provided by and used with permission of Roger Hankey, a Minnesota home inspector. D'Agostino, P.E., C.I., & Daniel Friedman updated 6 8 We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Click to enlarge the image and you can see the thickness of the copper cladding around the solid aluminum conductor core of this wire. Photo at page top: a #10 copper-clad aluminum electrical wire showing the stripped and cut end. This article describes the history of copper-clad aluminum electrical wiring and its safe use in homes in the United States. We have no relationship with advertisers, products, or services discussed at this website.Ĭopper-Clad Aluminum Electrical Wiring identification, safety, production methods. InspectAPedia tolerates no conflicts of interest.