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About 1976. The problem is that mobile homes are constructed with flimsier walls which will ignite when aluminum overheats. Copper can carry much more of a load than aluminum and therefore is safer.


The real hazard with aluminum wiring is related more to bad connections and improperly completed electrical work.


While aluminum wire cannot handle the flow of electrical current as well as copper, this is corrected by the use of a larger size of wire (as outlined in the CEC or NEC respectively). Therefore, assuming all other factors are taken into account, like correctly sized breakers and properly planned circuits, the wire itself will not have any issues with heating.


However, the same cannot be said of wiring that was done with connectors and devices such as plugs and switches that are not rated for use with aluminum wiring.


Bad connections caused by devices not rated for aluminum wiring or connectors that are not rated, can cause a poor electrical connection, which in turn will create heat. This in turn can cause wires to overheat and burn back from the bad connection and then potentially cause a fire.


Through knowledgeable application of the correct strategies and materials, aluminum wiring is no different that copper wire. Both are subject to heating problems if not connected properly or sized correctly for its application.


But, when installations are completed properly, these concerns are unfounded and aluminum wiring is no less safe than copper.

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