Here are some samples of aluminum wiring I've encountered.
All these pictures are from Oshawa and Whitby homes with Aluminum wiring.
Aluminum wiring is a form of wiring that was used from the late 1960's to the mid 1970's. The main problem with aluminum wire is at it's connection point.
All devices need to be approved for aluminum wire and need to be torqued to the proper value.
If you suspect you have aluminuim wiring call Barrett Electric Inc. to provide a free assessment.