Abstract: An insulator and cable, wherein the insulator includes a spacer of low dielectric factor having a first end and a second end, wherein the first end comprises more than about three quarters of an axial length of the insulator and wherein the first end has a generally cylindrical opening extending axially therein of a diameter sufficiently larger than the wire diameter such that the wire can be axially extended through the opening without contacting the first end and the second end has a generally conical opening having a larger end communicating with the cylindrical opening and a smaller end adjacent a wire retaining surface.