Patent ID: 7551412

Claim:
A wiring fault correction circuit for determining wiring conditions of an AC supply system, comprising: input line and neutral conductors configured to be coupled to the AC supply system; output line and neutral conductors configured to be coupled to a load; first, second, third, and fourth single pole, single throw relays; a first driver that controls the first and second single pole, single throw relays to respectively connect the input line conductor to the output line conductor and the input neutral conductor to the output neutral conductor in response to a conectly wired AC supply system, wherein the first driver circuit comprises: a first diode, a first resistor, and a first capacitor connected in series between the input line conductor and ground; a switching device having first and second input terminals connected in parallel with the first capacitor and an output terminal coupled to relay coils of the first and second single pole, single throw relays; and a second resistor connected at one end between the first resistor and the first capacitor and at the other end to the first input terminal of the switching device, wherein the first diode, first capacitor, and first and second resistors supply a leakage current that activates the switching device in response to an AC voltage signal on the input line conductor, whereby the switching device activates the first and second single pole, single throw relays; and a second driver circuit that controls the third and fourth single pole, single throw relays to respectively connect the input line conductor to the output neutral conductor and the input neutral conductor to the output line conductor in response to an incorrectly wired AC supply system in which line and neutral conductors of the AC supply system are reversed.