A ground fault monitoring system includes a ground fault interface device including a power interface and a data interface. The ground fault interface device is structured to output power via the power interface and to receive data via the data interface. The ground fault monitoring system also includes a plurality of ground fault devices structured to detect a ground fault on an associated circuit, to output data of the detected ground fault to the ground fault interface device, and to receive power to operate the ground fault devices via power lines. The plurality of ground fault devices are electrically connected in a series connection with the ground fault interface device by data lines and power lines. Each of the ground fault devices is configured to pass through received data and power.