Aluminum Wiring: 1960s through 1970s
As the price of copper soared in the 1960s, it became commonplace for home electrical wires to be made using aluminum instead of copper. It is estimated that nearly two million homes were wired with aluminum between 1962 and 1972.
Many receptacles and switches manufactured during this time were not intended for use with aluminum wire. This inadequate equipment, combined with poor installation practices, resulted in loose electrical connections, which pose a potential fire hazard.
The best way to determine whether a home has aluminum wiring is to hire a licensed, qualified electrician, but it may also be possible to identify an aluminum-wired system by checking the cables that run through the basement or attic to see if the cable is labeled “AL” or Aluminum.
If your home has aluminum wiring that was installed in the 1960s or 70s, have a licensed, qualified electrician verify that all connections are properly made using wiring devices and other equipment that have been certified for use with aluminum wire.
Homes built today may have aluminum alloy wire used for the service entrance conductors and large appliances. Provided the connections, circuit breakers and devices are all marked with the letters “AL”, these types of installations are acceptable when installed in accordance with the National Electrical Code.
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