An apparatus and method for producing elongated strip, wire or cable, a portion or all of which is defined by electrically superconducting material. An elongated wire, strip or cable is controllably coated with one or more materials which define a superconducting layer thereon or a plurality of such superconducting layers which bond or solidify on the substrate. In a particular form, the superconductor is formed as a layer secured to a wire-like substrate having an outer stratum that is electrically insulative, and a second layer of insulating material is secured to the outer surface of the superconductor layer. In one embodiment, the substrate may be an optically transparent light pipe, such as made of glass.