Originally Posted by WheelMotor
Is the skin effect in the CCAW sufficient at the low frequency of only a few 100 Hz to justify its use ?
well copper clading offers a few benefits to just straight aluminum. Aluminum oxide will build up at terminals/any air exposure unless it's clad. The reason this is bad is aluminum oxide is actually electrically insulative (... actually besides diamond it's the most electrically insulative material on earth).
It's worth it in the long run but there are a number of ways to terminate aluminum wire safely without risk.
If you can find a cheaply priced CCAW flat wire I'd use it though... it's also quite a bit more conductive per cross section than just straight aluminum (10% more to be precise).