An aircraft power distribution network comprising first and second galvanically isolated power bus bars, and first and second remote data concentrators (RDCs), each RDC having an input/output interface (I/O) and a power supply, the first RDC power supply being connected to the first power bus bar, the second RDC power supply being connected to the second power bus bar, an input/output device being connected to the I/O of the first RDC and to the I/O of the second RDC, each RDC being adapted to supply electrical power to the input/output device through its respective I/O, wherein each RDC includes a switch for isolating the input/output device, and the switches being operatively coupled such that electrical power cannot be supplied to the input/output device by both RDCs simultaneously. Also, a method of operating the network.