A power line data transceiver is for transmitting or receiving data over a power line. The power line is adapted to distribute electric power. The power line transmitter has a data transceiver coupled to the at least two wires of the shielded cable via a capacitive coupling network. The data transceiver is configured to transmit or receive a data signal over the at least two wires of the shielded cable. A power supply is coupled to the shielded cable over an inductive coupling network. The power supply is configured to inject a feeding current on the at least two wires of the shielded cable for feeding the electric load with electric power, and to receive a return current from the electric load over the conductive shield of the shielded cable.