![]() ![]() Modern receptacles and fixtures often also have CuAl stamped or engraved on them, meaning they can also be used with aluminum wire. The antioxidant paste (NoAlox is one name that comes to mind) prevents a layer of oxide from forming by not allowing air to touch the bare wire. After a few iterations you either get broken contact or a thermal runaway and fire. This air gap will grow a layer of aluminum oxide, which increases the electrical resistance of the junction and, consequently, the heat produced as current flows. ![]() The thermal expansion/contraction cycle of aluminum allows for intermittent contact between the wire and its corresponding terminal. IIRC, the main problem with aluminum wiring in residential applications was the failure to apply antioxidant compound to the bare wire ends when installing into a breaker, receptacle, switch, etc. ![]()
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