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‘CCA’ is Copper Clad/Coated Aluminum wire. This is ALUMINUM wire with a very thin coating of copper. At a glance it can appear the same as pure copper wire. The price may look attractive, but keep in mind that aluminum is only about 60% as conductive as copper. This means to carry the same load, you’d have to use a significantly heavier gauge wire, which can eliminate much of the cost savings. Substituting CCA wire for the same gauge copper wire is dangerous and can lead to burnt wiring or fires.