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How safe is aluminum wiring?
According to the U.S. Consumer Product Safety Commission, fires and even deaths have been reported to have been caused by this hazard. Problems due to aluminum wiring expansion, or arcing at the aluminum wiring connectors, can cause overheating at connections between the wire and devices (switches and outlets) or at aluminum wire splices. The connections can become hot enough to start a fire without ever tripping a circuit breaker!