.
Aluminum has far better conductivity per pound than does copper.

True, but it's much bulkier. An aluminum wire has to be much bigger than a
copper wire, if both are rated to carry the same wattage

... It is
also stronger per pound. And it is cheaper.

Not in marine grades, it isn't.



Steven Shelikoff wrote:
.... in applications where weight is critical, such as spacecraft,
aircraft, etc., they use copper instead of aluminum.

In a lot of aviation applications, and for sensitive instruments, platinum &
gold are used. Clearly not where cost is an issue though

DSK