Westridge Electric Ltd. is an Alberta based
business established in 1997.

How To Identify Aluminum Wiring

Identifying Aluminum Wiring in Your Home

Virtually all residential aluminum wiring was installed as plastic-sheathed or cloth cable (type NM, often called “Romex”) with no readily discernable distinction from a cable with copper conductors.


  • Look at the printed or embossed markings on the outer jacket of the electric cables, which are visible in unfinished basements, attics, or garages.
  • If necessary, use a flashlight shining on the surface at a low angle to help make the embossed markings readable.
  • Cable with aluminum conductors will have “Al” or “Aluminum” and other information marked on one side of the cable jacket every few feet along its length. (Note: be sure to read as much of the marking as possible because the marking “CU-clad” or “Copper-clad,” in addition to the “Al” or “Aluminum,” means that the cable uses copper-coated aluminum wire).

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If you are unable to identify the type of wire in your home by this method, but you suspect that you have aluminum wire, have a qualified electrician make the determination. If your home has aluminum wiring that has not been remediated, Westridge Electric recommends a permanent repair of the connections, as described on this website.

Contact Westridge Electric for any Copalum or Aluminum Wiring questions.

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