Wire and steel tube as AC cable

A system for conducting AC comprising:

• a. means for supply of AC having at least two terminals, a first and a second;
• b. at least one elongated electrical conductor means, insulated throughout its length and having a near end and a far end;
• c. at least one elongated shape, having a near end and a far end, which is:
• i. made of a ferromagnetic material having electrical conductivity;
• ii. adjacent to and coextensive of at least most of the length of said electrical conductor means;
• iii. capable of concentrating the flow of said AC when flowing in one direction of its length in a skin having conductance adjacent to and coextensive of the length of said electrical conductor means, said skin conductance concentrating being due to the electromagnetic field generated when said AC flows in a reverse direction in said adjacent electrical conducting means;
• iv. of a thickness at least twice the depth of said skin in which said flow of AC is concentrated;
• d. means for electrically connecting said first terminal of said AC supply means and said near end of said electrical conductor means;
• e. means for electrically connecting said second terminal of said AC supply means and said near end of said elongated shape;
• f. at least one electrical load with means for electrically connecting a first terminal of said load to said far end of said electrical conductor means, and means for electrically connecting a second terminal of said load to said far end of said elongated shape;
• g. an electrical circuit established:
• i. from said first terminal of said AC supply means through the substantial length of said electrical conductor means;
• then
• ii. through said electrical load;
• then
• iii. back through said substantial part of the length of said elongated shape so as to produce a skin effect current which is concentrated near the surface of that part of said elongated shape which is adjacent to said electrical conducting means;
• and at least some part of the cross section of said elongated shape outside of the surface skin wherein skin effect current is concentrated becomes an effective electrical insulator;
• and the surface on the far side of said elongated shape from said electrical conductor means carries only a negligibly small amount of current;
• then finally
• iv. back to said second terminal of said AC supply means to complete the electrical circuit;
• wherein
• h. the resistance of said electrical load is large compared to the resistance of said electrical conductor plus the resistance of said elongated shape as controlled by said skin effect therein.