On Wed, 24 Dec 2003 23:27:42 GMT, James Meyer Gave us:
Those lines are typically NOT copper. They are not saving copper either.
They run multiple strands to reduce I squared R effects. If all of the cables are an inch in diameter, your half inch skin area is where all the current will be flowing. In each strand. The result is that an equal single strand will not pass as much as the multiple array will. That is due to skin effect. The configuration form of using multiple isolated strands is a litz configuration.
If they were bonded together into one bundle, they would exhibit no benefit from skin effect. It appears as one conductor.
If there IS a benefit from skin effect, and it is due to multiple isolated conductors on a given run between two nodes, then it is a litz configuration, because THAT is the sole purpose for doing it.
My bundling of multiple mag strands to garner gains from skin effects IS a litz configuration because THAT is what litz configurations are for, regardless of the fact that the best configurations for the highest frequencies uses a woven form. That does NOT state that woven forms are the only that qualify for the moniker.