| 摘要 |
A power distribution apparatus, and related method, for coupling single-phase power from a three-wire input line to a power outlet only when the ac power signals carried on the input line have the correct polarity. Particular wires of the three-wire input line are designated to carry a positive power signal, a neutral power signal, and a negative power signal, with the positive and negative power signals having opposite polarities. The apparatus detects the voltage difference between the power signals carried on the two wires designated to carry the positive and negative power signals and couples power to the power outlet only when the detected voltage difference exceeds a prescribed threshold. Since the detected voltage difference exceeds the threshold only when the polarities of the power signals on the input line are correct, the system prevents the coupling of incorrect voltage levels to the power outlet and thus eliminates electrical shock hazards of this kind.
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