US Patent 7595455 Kenny clamp

An improved device for bonding a grounding electrode conductor to the enclosure of an electric service box comprising a grounding electrode conductor and a two part tapered metal sleeve connector assembly into which the conductor is inserted. A threaded fitting extends over the sleeve and a nut compresses the fitting and sleeve around the grounding electrode conductor. Both the conductor and the connector assembly are designed in conformance to the 2002 National Electric Code and the UL's Laboratory Manuals for connectors and grounding equipment.