A computer determines a characteristic corresponding to each of a first power source and a second power source. The first and second power sources are connected to one or more power distribution units and are configured to provide power in a datacenter. The characteristic includes at least one of a current, a resistance, a voltage, a frequency, a phase, and a magnetic field. The computer generates a comparison of the characteristic corresponding to the first power source and the second power source, to a threshold value of the characteristic. The computer determines if the comparison violates the threshold value of the characteristic. In response to determining the comparison does not violate the threshold value of the characteristic, the computer determines that the first power source and the second power source are connected to a given power distribution unit included in the one or more power distribution units.