An apparatus and method is provided for inhibiting theft of electrical wiring through the access opening of an electrical fixture supporting pole, such as a street light pole. Prior to securing the pole to the base, a wire clamping element is placed on the base around the passage for the power supply cable. The electrical power supply cable is clamped to a vertical surface of the clamping element, and the free end of the cable is extended to a location proximate the second opposed vertical surface of the clamping element. The electrical connection cable from the electrical fixture is then attached to the power supply cable, and the pole and the clamping element are secured to the base such that the access opening is positioned to provide access to the connections of the power supply cable and electrical connection cable from the electrical fixture, but access to the clamping device which secures the power supply cable to the first surface is not possible without removing the pole.