Abstract: An insulated power cable contains a multi-strand cable of a plurality of bundles of uninsulated wires, and electrical insulation sheathing the cable, the electrical insulation having a thickness of from 0.0625 to 0.5 inches (0.16 to 1.3 centimeters) and having a plurality of layers of spirally-wrapped, creped tape, the tape having at least 50 percent by weight of an aramid material, and a density of from 0.1 to 0.5 grams per cubic centimeter prior to being creped.

Abstract: This invention relates to a transformer containing an insulated power cable including a multi-strand cable of a plurality of bundles of uninsulated wires, and electrical insulation sheathing the cable, the electrical insulation having a thickness of from 0.0625 to 0.5 inches (0.16 to 1.3 centimeters) and containing a plurality of layers of spirally-wrapped, creped tape, the tape being including at least 50 percent by weight of an aramid material, the tape having a density of from 0.1 to 0.5 grams per cubic centimeter prior to being creped.

Abstract: A method of making various insulated conductor sizes during a transformer coil winding process by slitting and bonding insulating sheet materials and foil sheet conductor into a composite foil conductor/insulation. The method includes folding the composite into a substantially U-shaped length having a central portion between two leg portions with each leg portion having a free end. The method also includes folding the leg portions of the "U" inwardly to a position substantially parallel to the central portion of the "U" to bring the free ends of the leg portions into opposing relation to provide a folded insulated foil conductor having a two-conductor thickness surrounded by insulation. Provision is also made for increasing the cross-sectional area of the conductor.