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Not that I know of. When insulation is applied to wire it is extruded so that the insulating material is uniform around the conductor. Without this uniformity the conductors insulation factor would vary and the wire would have to be rated at the lowest reading factor when tested with a high voltage.

Even when splicing a wire, the electrical code states that the insulation covering the splice has to be brought up to or surpass the insulation factor that is supplied by the manufacturer of the wire.

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