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This paper presents an electric line study of microgrid. To optimize the management of electric sources, generally a proposed solution is the load shedding. To achieve it, the power line communication (PLC) is often used to communicate when it is not possible to add cables. Such technologies use the power line network as a propagation and communication medium. The network quality depends mainly on the power grid topology, but also on the connected household electrical appliances that have a large impact on the PLC systems due to their impedances and noise. In this paper, we propose a new simulation program with integrated circuit emphasis (SPICE) approach for modeling both the electromagnetic (EM) disturbances generated by a printer and the power network. First, the high-frequency power cable characteristics are extracted from S parameter measurements. Then, the model of EM noise generated by a printer is deduced from time-domain measurement and integrated to the SPICE simulator by means of its Laplace transform. Simulation and modeling results of a simple power grid are given in terms of insertion loss evaluation (S21 parameter). A validation of the EM noise model is performed by means of a comparison between simulation and measurement results in frequency domain at several points of a simple power network. The present approach allows the prediction of EM interference generated by all household devices at any access points of a power line network without carrying out a systematic measurement.