An electrical device is provided for a power line system for data transmission, including at least one line of a power supply network, at least one signal line, and a coupling region wherein the at least one line of the power supply network and the at least one signal line are partially arranged. The at least one line of the power supply network and the at least one signal line are electrically isolated from each other and capacitively coupled to each other in the coupling region. A motor vehicle is equipped with the power line system for data transmission.
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