Cut-away view of the AC line balancing transformer: (1) Toroid core made from steel banding with an epoxy jacket. (2) Final mylar wrap insulating material (3) Primary winding (4) Kapton® high voltage-high temperature insulator (5) 12 Awg lead wires (6) Secondary windings with center tap (7) Copper Faraday shield (grounded) between primary and secondary windings