As a material, aluminum expands and contracts much more than typical copper wiring, which can cause loose connections as electricity passes through, potentially resulting in a fire. In fact, according to the U.S. Consumer Product Safety Commission (CPSC), homes that have aluminum branch-circuit wiring are 55-times more likely to have connections that are deemed fire-hazards than homes with typical copper wiring
It’s important to note that not all aluminum wiring is considered bad, and some is still even installed on new construction today. These are mainly multi-strand aluminum wires, which are still regularly used on service and entrance conductors, as well as larger circuits in the home like the stove, water heater and HVAC systems. This is typically fine. It’s the single-strand wire variety that can be of concern. Although alloys were revised to this wiring over the years that may have somewhat improved its performance, single-strand aluminum is still a concern. Also, you may run into obstacles obtaining homeowners’ insurance. Fortunately, there are CPSC approved repairs available that can be performed by a qualified electrician, which many insurance carriers will accept
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