I seem to recall a period of time when aluminum wiring was popular in home building, especially manufactured housing (trailers.) The problem with fires was eventually tracked to the device connection screws gradually working loose from minute vibrations when power was turned on. For a while, aluminum was banned but I think the industry might have developed new connection methods to eliminate the vibration problem. Aluminum is still used for high voltage lines (on the tall towers we see from power plants to cities.)
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