Patent ID: 8339270

Claim:
An electrical circuit for detection of improper wiring of a three lead power supply, having leads of equal resistance, comprising: a sensor circuit for detecting the absence of electrical current in a putative hot lead of said three lead power supply; a sensor circuit for detecting the simultaneous presence of a source of electrical current in both of the putative ground lead and putative neutral lead of said three lead power supply; wherein the putative ground lead is in electrical communication with the putative neutral lead, causing the putative ground lead to be electrified as well an independent ground circuit in electrical communication with said sensor circuits for directing electrical current from said sensor circuits to earth; and an indicator circuit for generating a unique response signal specifically indicating the absence of electrical current in the putative hot lead, simultaneously with the presence of a source of electrical current in said putative ground and neutral leads, said indicator circuit being formed, in part, by said independent ground circuit and utilizing an independent power source to generate said unique response signal.