Patent ID: 7446539

Claim:
An identifying apparatus for a wiring arrangement of an alternating current (AC) power supply, the AC power supply comprising a hot line and a neutral line, the identifying apparatus comprising: a detecting circuit electrically coupled to the hot line and the neutral line of the AC power supply for detecting a voltage level between the hot line and the neutral line and generating a detection signal; and a control circuit comprising a relay having an inductance coil, and two single-pole double-throw (SPDT) switches, the detecting circuit electrically coupled to one terminal of the inductance coil, the other terminal of the inductance coil being grounded, the hot line and the neutral line electrically coupled to the corresponding power terminals of the electronic device via one contact of one of the SPDT switches and one contact of the other one of the SPDT switches respectively, the AC power supply supplying power to an electronic device via the control circuit, the control circuit coupled to the detecting circuit for receiving the detection signal of the detecting circuit, if the hot line and the neutral line are swapped, the control circuit preventing the AC power supply from supplying power to the electronic device.